RFCs can be obtained via FTP from FTP.ISI.EDU, with the pathname in- notes/rfcnnnn.txt (where "nnnn" refers to the number of the RFC). Login with FTP username "anonymous" and password "email@example.com".
RFCs can also be obtained via electronic mail from ISI.EDU by using the RFC-INFO service. Address the request to "firstname.lastname@example.org" with a message body of:
Retrieve: RFC Doc-ID: RFCnnnn
(Where "nnnn" refers to the number of the RFC (always use 4 digits - the DOC-ID of RFC 822 is "RFC0822")). The RFC-INFO@ISI.EDU server provides other ways of selecting RFCs based on keywords and such; for more information send a message to "email@example.com" with the message body "help: help".