Global coordination of the Internet’s unique identifiers.
This page provides direct access to the Internet Assigned Numbers Authority (IANA) functions: managing the DNS Root Zone, coordinating global IP addressing and AS number spaces, and maintaining the central repository for Internet protocol registries.
Domain Names
DNS Root, .int, .arpa
Number Resources
IP & AS Allocations
Protocols
Parameter & TZ Data
Quick Registry Access
Explore the Database of Top Level Domains, RIR Allocation Data, Protocol Registries, and the Time Zone Database.
Core Remit
Three pillars of global Internet coordination.
The global coordination of the DNS Root, IP addressing, and other Internet protocol resources is performed as the Internet Assigned Numbers Authority (IANA) functions.
Domain Names
Management of the DNS Root Zone (assignments of ccTLDs and gTLDs) along with other functions such as the .int and .arpa zones.
- Root Zone Management
- Database of Top Level Domains
- .int Registry
- .arpa Registry
- IDN Practices Repository
Number Resources
Coordination of the global IP and AS number spaces, such as allocations made to Regional Internet Registries.
- IP Addresses & AS Numbers
- Number Registries
- RIR Allocation Data
- Network abuse information
Protocol Assignments
The central repository for protocol name and number registries used in many Internet protocols.
- Protocol Registries
- Apply for an assignment
- Time Zone Database
Direct Directory
Technical registries and operational databases.
Access the authoritative repositories maintained under the IANA functions, organized by identifier category and sort relevance.
Root Zone Registry, .INT & .ARPA
Manage and inspect the Database of Top Level Domains (including assignments of ccTLDs and gTLDs), alongside specialized registries for the .int and .arpa zones and the IDN Practices Repository.
Time Zone Database & Protocol Registries
Access the central repository for protocol name and number registries used across Internet protocols, or download the Time Zone Database.
RIR Allocation Data & Abuse Information
Review global IP address and Autonomous System (AS) number spaces, allocations made to Regional Internet Registries, and network abuse information.
Performance, Archive & Organization
Follow operational news, review IANA performance documentation, browse the historical archive, or learn about the organization.
Institutional Structure
Provided by Public Technical Identifiers, an affiliate of ICANN.
The IANA functions coordinate the Internet’s globally unique identifiers, and are provided by Public Technical Identifiers, an affiliate of ICANN.
Root Zone & Domain Coordination
Assignments of ccTLDs and gTLDs in the DNS Root Zone, alongside operation of the .int and .arpa registries and the IDN Practices Repository.
Number & Protocol Stewardship
Allocations of global IP and AS number spaces to Regional Internet Registries, and maintenance of the central repository for Internet protocol registries.
Reference & Answers
Frequently asked questions about IANA.
Direct answers drawn from the official remit of the Internet Assigned Numbers Authority.
What are the Internet Assigned Numbers Authority (IANA) functions?
The global coordination of the DNS Root, IP addressing, and other Internet protocol resources is performed as the Internet Assigned Numbers Authority (IANA) functions.
Who provides the IANA functions?
The IANA functions coordinate the Internet’s globally unique identifiers, and are provided by Public Technical Identifiers, an affiliate of ICANN.
What does IANA manage under Domain Names?
IANA performs management of the DNS Root Zone (assignments of ccTLDs and gTLDs) along with other functions such as the .int and .arpa zones, the Database of Top Level Domains, and the IDN Practices Repository.
How are Number Resources and Protocol Assignments coordinated?
For Number Resources, IANA coordinates the global IP and AS number spaces, such as allocations made to Regional Internet Registries, and provides RIR allocation data and network abuse information. For Protocol Assignments, IANA maintains the central repository for protocol name and number registries used in many Internet protocols, processes applications for assignments, and maintains the Time Zone Database.
Apply for a protocol assignment or contact IANA.
Submit an inquiry regarding Protocol Assignments, Root Zone Management, .int and .arpa registries, or Number Resources.
- ✓ Apply for an assignment in the Protocol Registries
- ✓ Inquire about Root Zone Management, .int, or .arpa
- ✓ Contact Us regarding organizational or registry questions