http://www.rfc-editor.org/rfc/rfc3779.txt
RFC 3779: X.509 Extensions for IP Addresses and AS Identifiers, C. Lynn, S. Kent, K. Seo2004-06-01T23:00:00-00:00This document defines two X.509 v3 certificate extensions. The first binds a list of IP address blocks, or prefixes, to the subject of a certificate. The second binds a list of autonomous system identifiers to the subject of a certificate. These extensions may be used to convey the authorization of the subject to use the IP addresses and autonomous system identifiers contained in the extensions. [STANDARDS-TRACK]