Internet Assigned Numbers Authority (IANA)

What is IANA?

The Internet Assigned Numbers Authority (IANA) is a set of functions that maintain protocol parameter registries, allocate IP address blocks, and maintain the Domain Name System (DNS) root zone, where top-level domains like ".com" are recorded and delegated.

IANA’s functions are carried out by Public Technical Identifiers (PTI), which is an affiliate of the Internet Corporation for Assigned Names and Numbers (ICANN).

What does IANA do?

What the IANA coordinates and what it achieves. IANA’s four core responsibilities include:

IP address allocation: Allocates IP address blocks to Regional Internet Registries (RIRs), which distribute them to ISPs and other organizations.
DNS root zone management: Maintains the DNS root zone file by adding, modifying, or removing top-level domain (TLD) entries and ensuring each TLD is correctly linked to its authoritative name servers so domain queries can be routed properly.
Protocol registries: Maintains registries of protocol parameters, such as port numbers and protocol identifiers, ensuring they’re uniquely assigned and consistently defined in coordination with the Internet Engineering Task Force (IETF).
Autonomous System Number (ASN) allocation: Allocates ASN ranges to RIRs, which assign them to ISPs and other organizations as unique identifiers for their networks.

Why is IANA important?

By coordinating unique identifiers, IANA helps maintain the internet's overall stability and global interoperability. It supports DNS operations and enables communication between devices and networks.

It also enables global routing by allocating IP address blocks and other network identifiers, helping prevent duplication and reduce the risk of IP conflicts and routing errors.

FAQ

What does the Internet Assigned Numbers Authority do?

IANA coordinates the unique identifiers used by internet protocols. Its responsibilities include allocating IP address blocks, maintaining protocol parameter registries, and managing updates to the Domain Name System (DNS) root zone.

Is the Internet Assigned Numbers Authority the same as ICANN?

No. IANA refers to functions coordinated by the Internet Corporation for Assigned Names and Numbers (ICANN), with day-to-day operations carried out by the Public Technical Identifiers (PTI), an ICANN affiliate.

How does the Internet Assigned Numbers Authority affect DNS and IP addresses?

IANA manages the DNS root zone, where top-level domains like .com and .org are mapped to authoritative name servers. It also allocates large blocks of IPv4 and IPv6 addresses to Regional Internet Registries (RIRs), which distribute them to Internet Service Providers (ISPs).

Does the Internet Assigned Numbers Authority control the whole internet?

No. IANA coordinates key parts of internet infrastructure, such as IP addresses and the Domain Name System (DNS). Without IANA, coordination of these systems would be disrupted.

Why does the Internet Assigned Numbers Authority matter for cybersecurity?

IANA supports internet stability by coordinating identifiers such as IP addresses and domain names. While this helps reduce conflicts and misconfigurations, cybersecurity depends on additional systems and practices beyond IANA’s role.