Each autonomous system (AS) is assigned a unique autonomous system number (ASN). ASNs are managed globally by the Regional Internet Registries (RIRs) through the Internet Assigned Numbers Authority (IANA).
What is an AS?
An AS is a group of networks or subnets that trust each other and use the same routing policy to communicate via the Border Gateway Protocol (BGP). In Edge Security Acceleration (ESA) rules, ASNs are unique numbers used to identify and distinguish different network providers or geographical regions. By referencing ASNs, ESA helps you intelligently manage network sources, boosting performance, security, and user experience.
What is an ASN?
An ASN is a 32-bit integer that uniquely identifies an autonomous system and is used to identify different networks or network providers in BGP. In ESA rules, each ASN is used as an identifier for matching and managing traffic for a particular network or geographic region.
There are five RIRs in the world. RIRs manage ASNs within their respective regions.
Query the ASN of an IP address
Query the ASN through the RIR in your region
Visit the official website of the RIR in your region. If you are located in Asia Pacific, enter https://wq.apnic.net/static/search.html in the address bar of your browser.
Enter your IP address in the search box and click Search to obtain the ASN.
Query the organization information of an ASN
Query the organization information through the RIR in your region
Visit the official website of the RIR in your region. If you are located in Asia Pacific, enter https://wq.apnic.net/static/search.html in the address bar of your browser.
Enter your IP address in the search box and click Search to obtain the organization information of the ASN.
Query the organization information by using the DNSCHECKER tool
Enter https://dnschecker.org/asn-whois-lookup.php in the address bar of your browser.
Enter the ASN in the search box and click Lookup ASN to obtain the organization information of the ASN.
Query all ASNs
You can query all ASNs through the official website of the IANA.
Enter https://www.iana.org/assignments/as-numbers/as-numbers.xhtml in the address bar of your browser.