IANA-managed Reserved Domains

Certain domains are set aside, and nominally registered to “IANA”, for specific policy or technical purposes.

Example domains

As described in RFC 2606 and RFC 6761 , a number of domains such as example.com and example.org are maintained for documentation purposes. These domains may be used as illustrative examples in documents without prior coordination with us. They are not available for registration or transfer.

Test IDN top-level domains

These domains were temporarily delegated by IANA for the IDN Evaluation being conducted by ICANN .

Policy-reserved domains

We act as both the registrant and registrar for a select number of domains which have been reserved under policy grounds. These exclusions are typically indicated in either technical standards (RFC documents), or contractual limitations .

Domains which are described as registered to IANA or ICANN on policy grounds are not available for registration or transfer, with the exception of country-name .info domains. These domains are available for release by the ICANN Governmental Advisory Committee Secretariat.

Other Special-Use Domains

There is additionally a Special-Use Domain Names registry documenting special-use domains designated by technical standards. For further information, see Special-Use Domain Names (RFC 6761).


The page provides statistics of domain registrations by the registrar.

A company authorized by ICANN (the Internet Corporation for Assigned Names and Numbers) to put domain names on sale is called a domain name registrar.

Registrations distribution, by TLD

Domain registrations dynamics - %details%.

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Home » Blog » Internet Governance

What Is IANA? The Internet Assigned Numbers Authority

The Internet Assigned Numbers Authority plays a major role in today's internet. However, not many know about this organization or its responsibilities. Continue reading to learn all about IANA.

Internet Assigned Numbers Authority - IANA

IANA , or the Internet Assigned Numbers Authority, is an organization responsible for the assignment of numbering systems and unique names that form the backbone of the global internet. 

IANA effectively manages registries that deal with three categories of Internet identifiers:

Even though the internet is not centralized, we need to manage some of its key elements centrally to achieve global coordination. IANA functions as the administrator that handles this critical coordination. It is one of the several authorities that enable the World Wide Web to be what it is today. 

Now that you know what IANA is, we can move forward. Due to the importance of IANA’s role in the global internet, we make sure to cover its responsibilities, history and relations to other organizations like ICANN (Internet Corporation for Assigned Names and Numbers).

History of IANA

The need to manage IP addresses , Internet Protocols and the DNS was apparent from the early days of the internet. In the beginning, a single person handled the tasks that now require an entire organization such as IANA. His name was Jon Postel . 

In the early 1970s, while working at the University of California, Los Angeles (UCLA), Postel was instrumental in employing the ARPANET protocols and, essentially, building the predecessor of today’s internet. Postel quickly figured out that administering and managing socket numbers was important.

A socket number is a combination of an IP address and a port number. A socket number effectively addresses specific applications on specific computers. 

IP address and port number separated in the socket address example.

Even though it was easy to manage ARPANET in the early 70s, Postel realized that we shouldn’t use the same numbers for different applications. 

Postel was known as the Czar of Socket Numbers at the Information Sciences Institute (ISI) at the University of Southern California when he became responsible for handling them. However, officially, DARPA (Defense Advanced Research Projects Agency) handled this responsibility. 

The Internet Assigned Numbers Authority came into the picture in 1988. Until 1998, both DARPA and ISI funded it. 

NTIA (National Telecommunications and Information Administration) at the United States Department of Commerce released the Management of Internet Names and Addresses white paper in 1998. This is when ICANN, a private organization, became responsible for IANA. 

The US government continued supervising the authority until 2016. Afterward, IANA’s responsibilities moved entirely to the private sector.

IANA Responsibilities

IANA maintains an administrative role over the three main types of internet identifiers:

Protocol parameters

The primary function of IANA is to make sure these essential values and names remain unique and publicly available. 

A table representing IANA's responsibilities.

To understand what all of this means exactly, let’s take a look at each of the three responsibilities and what IANA actually does.

DNS root zone

The DNS is a hierarchical database that connects domain names to an IP address. This further enables computers to send data to each other. 

IANA is responsible for domain name management of DNS root servers and the DNS root itself. In simpler terms, IANA manages the DNS root zone that keeps the data at the top-level domains like .com and .net. 

IANA also administers the central collection of all allowed internationalized domain names . They are commonly known as special character domains. 

IP addresses

IANA manages the global pool of IP addresses (both IPv4 and IPv6 addresses ). It also manages AS numbers (ASNs) that are assigned to five Regional Internet Registries (RIRs). 

Each RIR handles a specific part of the globe:

IANA assigns blocks of IP addresses to each Regional Internet Registry. Subsequently, RIRs split the blocks into smaller blocks and assign them to respective National Internet Registries (NIRs) and Local Internet Registries (LIRs). 

Finally, these registries pass the blocks of IP addresses to different internet service providers that handle your internet connection. 

IANA reserves these blocks of private IP addresses for network administrators:

For the internet to work, a mutual understanding between computers is necessary. That’s where protocol parameters, or specific numbers used in networking protocols, come into the picture.

For computers to understand each other, these protocol parameters need to be unique. Thus, IETF (Internet Engineering Task Force) introduced technical protocol standards. 

IANA’s task here is to maintain and publish the protocol registries so that software makers can enable seamless communication. 

Some of the common parameters are:

HTTP status codes inform a user if a request to a server has been processed successfully, if authentication is needed or if an error occurred. For instance, the dreaded 404 (Not Found) error that all internet users know is an HTTP status code, but there are many other HTTP status codes .

404 HTTP status code warning on a computer.

Port numbers help identify the senders and recipients of data packets. There are 65,535 ports per IP address , and they all fall into different categories. Each port is reserved for a particular task. For example, port 80 is used for surfing the web. 

IANA handles ports up to port 49,151, while the remaining ones are dynamic and not connected to a specific application.

Language abbreviations show the language of specific content. EN determines English, ES determines Spanish, FR determines French and so on. 


The Internet Assigned Numbers Authority is effectively a division of ICANN. This nonprofit organization comprises numerous groups that represent different databases. 

The US Department of Commerce tasked ICANN to manage IANA from 1998. However, as of 2016, ICANN incorporated the Public Technical Identifiers, an affiliate corporation from California, to take over the management of IANA.

The incorporation occurred after the contract with the Department of Commerce expired. This event is important as it effectively made IANA part of the private sector. 

Since 2018, IANA has been managed by Kim Davies . Jon Postel and Joyce K. Reynolds managed it until 1998. Up until Davies took the seat in 2018, three other people managed the organization, each for a few years.

As you can see, the Internet Assigned Numbers Authority is an important organization that coordinates numerous activities. These activities make the global internet possible. 

IANA maintains the time zone database. It keeps track of domain names, IP addresses, ASN numbers and protocol parameter identifiers. This is what enables the internet we know and love today to support global virtual communication.

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IANA (Internet Assigned Numbers Authority)

Katie Terrell Hanna

What is IANA (Internet Assigned Numbers Authority)?

IANA (Internet Assigned Numbers Authority) is the organization that oversees the allocation of IP addresses to internet service providers ( ISPs ).

IANA has changed hands several times since its inception.

From 1998 to 2016, it was managed by the Internet Corporation for Assigned Names and Numbers ( ICANN ), a nonprofit organization under contract with the U.S. Department of Commerce.

In 2014, the Department of Commerce announced its intention to begin the IANA stewardship transition of internet domain name functions to a multistakeholder, global community.

In 2016, ICANN created Public Technical Identifiers to take over IANA functions as part of the private sector.

What are IANA responsibilities?

In addition to global IP addressing , IANA is also responsible for domain name system ( DNS ) root zone management, autonomous system numbers and any "unique parameters and protocol values" for the internet community.

These include port numbers , character sets, Multipurpose Internet Mail Extensions media access types and internet numbers. Internet numbers are unique identifiers assigned to resources used in networking protocols .

Internet protocols are published as Request for Comments documents that detail the research, behaviors, and enhancements of the internet and internet-related systems.

Because of this, IANA works hand in hand with the Internet Engineering Task Force and the Internet Architecture Board of the Internet Society, which work together to define standard operating internet protocols, such as TCP/IP .

Let's take a look at a few examples in depth.

Protocol assignments

IANA maintains over 2,000 protocol registries and protocol parameters. It also coordinates the registration of protocols.

Domain names

The Department of Commerce's National Telecommunications and Information Administration is responsible for maintaining a secure DNS with IANA functions as a critical component to its performance.

As part of its responsibilities, IANA facilitates root nameservers, which are at the top of the DNS hierarchy. IANA collaborates with top-level domain registrars, root nameserver operators and ICANN policymakers as part of the management of DNS.

how dns works

IANA also manages DNS Security Extensions , DNS root zone servers, .INT registry for international treaty organizations, .ARPA zone for internet infrastructure, and reverse DNS service.

IPv6 address example

IP addresses

IANA delegated the responsibility for allocating IP address blocks to different areas across the globe to regional internet registries (RIRs), which then divide their address pools into smaller blocks delegated to ISPs.

To ensure their interests are represented globally, RIRs created the Number Resource Organization to oversee policy statements .

IANA designates address space in the size of /8 prefix blocks for IPv4 and /23 to /12 prefix blocks from the IPv6 block to RIRs as needed.

Continue Reading About IANA (Internet Assigned Numbers Authority)

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Internet Assigned Numbers Authority definition

Examples of internet assigned numbers authority in a sentence.

Digi-Sign has been assigned the Private Enterprise Number 8420 by Internet Assigned Numbers Authority (IANA).

The subtags that are available for use with RFC 5646 are available from the Internet Assigned Numbers Authority (IANA) at [IANA-LANG] http://www.iana.org/assignments/language-subtag-registry.Matching, if applicable, should be in accordance with RFC 4647, Matching Language Tags, [RFC4647].The xs:language type shall be used for languages.

The Internet Assigned Numbers Authority (IANA) has delegated responsibility for administration of Internet numbering to the Latin American and Caribbean Internet Address Registry (LACNIC).

In the Internet this function is performed by the Internet Assigned Numbers Authority (IANA), which delegates authority to Regional Internet Registries (RIR).

None of the funds made available by this Act may be used to relinquish the responsibility of the National Telecommunications and Information Administration, during fiscal year 2016, with respect to Internet domain name system functions, including responsibility with respect to the authoritative root zone file and the Internet Assigned Numbers Authority functions.

Among other things, it is checked at recognised registries such as Stichting Internet Domeinregistratie Nederland (SIDN) or Internet Assigned Numbers Authority (IANA) whether Subscriber is the owner of the domain name.KPN has 3 permitted methods for domain validation according to the Baseline Requirements of the CA/BROWSER forum.

DOC Agreements with IANA and VeriSignA contract between DOC and ICANN, which currently extends through September 30, 2011, authorizes the Internet Assigned Numbers Authority (IANA) to perform various technical functions such as allocating IP address blocks, editing the root zone file, and coordinating the assignment of unique protocol numbers.

The Internet Assigned Numbers Authority (IANA) is the overall authority for the IP Addresses, the Domain Names, and many other parameters, used in the Internet.

Department of Commerce, National Telecommunications and Information Administration, “Request for Comments on the Internet Assigned Numbers Authority (IANA) Functions,” 76 Federal Register 10570, February 25, 2011.

Afterwards, it is verified that the applicant has that obtained IP address assigned, searching on Internet Assigned Numbers Authority (IANA) or on Regional Internet Registry (RIPE, APNIC, ARIN, AfriNIC, LACNIC).

Related to Internet Assigned Numbers Authority

Data Universal Number System (DUNS) Number means the 9-digit number assigned by Dun and Bradstreet, Inc. (D&B) to identify unique business entities.

Securities Authority means the Ontario Securities Commission and any other applicable securities commissions or securities regulatory authority of a province or territory of Canada.

Identifying number means a symbol or address that identifies only one unit in a common interest community.

Data Universal Numbering System +4 (DUNS+4) number means the DUNS number assigned by D&B plus a 4- character suffix that may be assigned by a business concern. (D&B has no affiliation with this 4-character suffix.) This 4-character suffix may be assigned at the discretion of the business concern to establish additional SAM records for identifying alternative Electronic Funds Transfer (EFT) accounts for the same parent concern.

Fax Number 293 0000 Xxxex Number: RS 21445 BAYSIN Attention: Mr Stefan Hattenkofer/Mr Nx Xxxxx Xxx By: /s/ Patrxxxx Xxx By: /s/ Ng Cxxxx Xxx ----------------------------- -------------------------------- Name: Patrxxxx Xxx Name: Ng Cxxxx Xxx --------------------------- ------------------------------ Title: Vice President Title: Assistant Vice President -------------------------- ----------------------------- CITIBANK, N.A., SINGAPORE BRANCH 5, Sxxxxxx Xxx, #00-00, XXX Xxxxxxxx, Xxxxxxxxx 000000. Fax Number: 225 0000 Xxxex Number: RS 24584 CITBANK Attention: Mr Bxxx Xxxx/Mr Lxx Xxxex Xxxx By: /s/ Bill Xxxx ----------------------------------------- Name: Bill Xxxx --------------------------------------- Title: Director, Head of Public Sector Unit -------------------------------------- OVERSEAS UNION BANK LIMITED 1, Rxxxxxx Xxxxx, 00xx Xxxxx, XXX Xxxxxx, Xxxxxxxxx 000000.

Brand Name or Equal Specification means a specification which uses one or more manufacturer’s names or catalogue numbers to describe the standard of quality, performance, and other characteristics needed to meet District requirements, and which provides for the submission of equivalent products.

Winning Numbers means the game results selected during a Drawing which shall be used to determine winning Plays contained on game ticket or ticketless transaction.

Data Universal Numbering System+4 (DUNS+4) number means the DUNS number assigned by D&B plus a 4-character suffix that may be assigned by a business concern. (D&B has no affiliation with this 4-character suffix.) This 4-character suffix may be assigned at the discretion of the business concern to establish additional SAM records for identifying alternative Electronic Funds Transfer (EFT) accounts (see the FAR at subpart 32.11) for the same concern.

Securities Authorities means the BCSC and the applicable securities commissions and other securities regulatory authorities in each of the other provinces of Canada;

Authority Software means software which is owned by or licensed to the Authority, including software which is, or will be used by the Contractor for the purpose of providing the Services but excluding the Contractor Software.

Data Universal Numbering System (DUNS) number means the 9-digit number assigned by Dun and Bradstreet, Inc. (D&B) to identify unique business entities.

Customs authority means the authority that is responsible under the law of a Party for the administration and enforcement of customs laws and regulations; Customs duty includes any duty or charge of any kind imposed in connection with the importation of goods, but does not include any:

Sanctions Authority means: (i) the United Nations (including the United Nations Security Council), the United States, the European Union, any Member State of the European Union and the United Kingdom; and (ii) the respective governmental, judicial, public or regulatory agencies, authorities or bodies of any of the foregoing, including the Office of Foreign Assets Control of the U.S. Department of the Treasury (“OFAC”), the United States Department of State, the European Commission and Her Majesty’s Treasury (“HMT”);

Automatic Number Identification or "ANI" means a Feature Group D signaling parameter which refers to the number transmitted through a network identifying the billing number of the calling party.

Standards Authority means NERC, and the NERC regional entities with governance over PJM and NYISO, any successor thereof, or any other agency with authority over the Parties regarding standards or criteria to either Party relating to the reliability of Transmission Systems.

Federal Award Identification Number (FAIN) means an Award number assigned by a Federal agency to a Prime Recipient.

public communications network means an electronic communications network used wholly or mainly for the provision of electronic communications services available to the public which support the transfer of information between network termination points;

Digital Signal Level 0 (DS-0 means the lowest-level signal in the time division multiplex digital hierarchy, and represents a voice-grade channel operating at either the 56 Kbps or 64 Kbps transmission bit rates. There are twenty-four (24) DS-0 channels in a DS-1.

Serial number within the enterprise identifier means a combination of numbers, letters, or symbols assigned by the enterprise to an item that provides for the differentiation of that item from any other like and unlike item and is never used again within the enterprise.

License number means the official number issued to a private security services business licensed by

Enterprise identifier means a code that is uniquely assigned to an enterprise by an issuing agency.

Registrant Fax Ext 4321 Registrant Email: [email protected] Admin ID: 5372809-ERL Admin Name: EXAMPLE REGISTRANT ADMINISTRATIVE Admin Organization: EXAMPLE REGISTRANT ORGANIZATION Admin Street: 000 XXXXXXX XXXXXX Xxxxx Xxxx: ANYTOWN Admin State/Province: AP Admin Postal Code: A1A1A1 Admin Country: EX Admin Phone: +1.0000000000 Admin Phone Ext: 1234 Admin Fax: +1.5555551213 Admin Fax Ext: Admin Email: [email protected] Tech ID: 5372811-ERL Tech Name: EXAMPLE REGISTRAR TECHNICAL Tech Organization: EXAMPLE REGISTRAR LLC Tech Street: 000 XXXXXXX XXXXXX Xxxx Xxxx: ANYTOWN Tech State/Province: AP Tech Postal Code: A1A1A1 Tech Country: EX Tech Phone: +1.1235551234 Tech Phone Ext: 1234 Tech Fax: +1.5555551213 Tech Fax Ext: 93 Tech Email: [email protected] Name Server: NS01.EXAMPLEREGISTRAR.TLD Name Server: NS02.EXAMPLEREGISTRAR.TLD DNSSEC: signedDelegation DNSSEC: unsigned >>> Last update of WHOIS database: 2009-05-29T20:15:00Z <<< Registrar Data: Query format: whois “registrar Example Registrar, Inc.” Response format: Registrar Name: Example Registrar, Inc. Street: 0000 Xxxxxxxxx Xxx City: Marina del Rey State/Province: CA Postal Code: 90292 Country: US Phone Number: +1.0000000000 Fax Number: +1.3105551213 Email: [email protected] WHOIS Server: whois.example-registrar.tld Referral URL: xxxx://xxx.xxxxxxx-xxxxxxxxx.xxx Admin Contact: Xxx Registrar Phone Number: +1.3105551213 Fax Number: +1.3105551213 Email: [email protected] Admin Contact: Xxxx Registrar Phone Number: +1.3105551214 Fax Number: +1.3105551213 Email: [email protected] Technical Contact: Xxxx Geek Phone Number: +1.3105551215 Fax Number: +1.3105551216 Email: [email protected] >>> Last update of WHOIS database: 2009-05-29T20:15:00Z <<< Nameserver Data: Query format: whois “NS1.EXAMPLE.TLD”, whois “nameserver (nameserver name)”, or whois “nameserver (IP Address)” Response format: Server Name: NS1.EXAMPLE.TLD IP Address: IP Address: 2001:0DB8::1 Registrar: Example Registrar, Inc. WHOIS Server: whois.example-registrar.tld Referral URL: xxxx://xxx.xxxxxxx-xxxxxxxxx.xxx >>> Last update of WHOIS database: 2009-05-29T20:15:00Z <<< The format of the following data fields: domain status, individual and organizational names, xxxxxxx, xxxxxx, xxxx, xxxxx/xxxxxxxx, postal code, country, telephone and fax numbers (the extension will be provided as a separate field as shown above), email addresses, date and times should conform to the mappings specified in EPP RFCs 5730-5734 so that the display of this information (or values return in WHOIS responses) can be uniformly processed and understood. In order to be compatible with ICANN’s common interface for WHOIS (InterNIC), WHOIS output shall be in the format outline above.

Reference Number means ninety-eight million, one-hundred eighty-one thousand, eight hundred eighteen (98,181,818) shares of DHI Common Stock (as adjusted for any stock split, stock dividend, reverse stock split or similar event occurring after the Merger).

Notice of Publicly Available Information means an irrevocable notice from the Notifying Party to the other party that cites Publicly Available Information confirming the occurrence of the Credit Event or Potential Repudiation/Moratorium, as applicable, described in the Credit Event Notice or Repudiation/Moratorium Extension Notice. The notice given must contain a copy, or a description in reasonable detail, of the relevant Publicly Available Information. If “Notice of Publicly Available Information” is applicable to a Credit Derivative Transaction and the Credit Event Notice or Repudiation/Moratorium Extension Notice, as applicable, contains Publicly Available Information, such Credit Event Notice or Repudiation/Moratorium Extension Notice will also be deemed to be a Notice of Publicly Available Information.

Applicable Public Official or State Employee means any public official or state employee described in

Batch number means a unique numeric or alphanumeric identifier assigned prior to any testing to allow for inventory tracking and traceability.

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AS65999 Reserved - Internet Assigned Numbers Authority

General info - as65999, reserved - internet assigned numbers authority, mobily.com.sa, ip address ranges.


What is an autonomous system (as).

An Autonomous System (AS) is a collection of connected networks that operate under a common administrative domain and share routing policies. Each AS is identified by a unique Autonomous System Number (ASN), which is used to exchange routing information with other ASs. AS can control how traffic flows through networks and then filter out unwanted traffic.

autonomous system

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