The rfcfind tool (a perl script; sorry) helps you search through the RFCs for information on things you're looking for and display them, grep them, etc.
Eventually it may:
Example Usage
# rfcfind --sync-rfcs
[snip]
# rfcfind -r avian
rfcfind -r avian
1149 Standard for the transmission of IP datagrams on avian carriers.
D. Waitzman. April 1 1990. (Format: TXT=3329 bytes) (Updated by
RFC2549) (Status: EXPERIMENTAL)
2549 IP over Avian Carriers with Quality of Service. D. Waitzman.
April 1 1999. (Format: TXT=9519 bytes) (Updates RFC1149) (Status:
INFORMATIONAL)
found: 2
# rfcfind -n 3514
3514 The Security Flag in the IPv4 Header. S. Bellovin. April 1 2003.
(Format: TXT=11211 bytes) (Status: INFORMATIONAL)
found: 1