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Welcome to the 4-byte AS Number Wiki!
This site is hosted by ARIN to facilitate discussion and the sharing of information on 4-byte AS number topics and issues. If you have never used a Wiki before, please consult the User's Guide for information on using the Wiki software. Also, the links below will help you get started in adding content and using this site.
Before adding any content to this website, please review this site's Privacy Policy and Disclaimers documents. Links are provided at the bottom of every page. Also, users and contributors must review the Acceptable Use Policy.
Background
Massive Internet growth has depleted the existing pool of 2-byte AS numbers (65,536 numbers in total). As a result, engineers have expanded the AS number space from 2-bytes to 4-bytes, to include over 4 billion AS numbers.
Following a globally coordinated policy, ARIN and all the Regional Internet Registries began allocating 4-byte AS numbers by request in January 2007; January 2009 marked the transition to allocating 4-byte AS numbers by default. To date, some routers still do not support the use of the 4-byte AS numbers.
To help vendors understand how to provide 4-byte AS number support and to help network operators find products that support 4-byte AS numbers, ARIN has set up this Wiki. The Wiki will allow the community to exchange and share information about 4-byte AS numbers and contribute resources that may assist other community members including users, ISPs, and vendors.
Resources
4-byte AS Number Vendor Software Support Information
4-byte AS Number Operational Issues
- TBD
Useful Links to 4-byte AS Number Information
- Other Wikis
- Presentations and Other Resources
Relevant Information at ARIN.NET
If you would like more information about ARIN's policies and procedures related to 4-byte AS numbers, or a look at community discussions and other materials, we encourage you to make use of the ARIN website. We've provided some links below to highlighted information.
- ASN section of Number Resource Policy Manual
- Instructions-Requesting an ASN from ARIN
- ARIN Fee Schedule
- ARIN Registration Statistics
