http://www.rfc-editor.org/rfc/rfc5494.txt
RFC 5494: IANA Allocation Guidelines for the Address Resolution Protocol (ARP), J. Arkko, C. Pignataro2009-04-01T23:00:00-00:00This document specifies the IANA guidelines for allocating new values in the Address Resolution Protocol (ARP). This document also reserves some numbers for experimentation purposes. The changes also affect other protocols that employ values from the ARP name spaces. [STANDARDS-TRACK]