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Some "good to know" RFCs (at least if you're an IT guy, like me)...
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RFC 0791 - Internet Protocol
RFC 0792 - Internet Control Message Protocol
RFC 0793 - Transmission Control Protocol
RFC 0821 - Simple Mail Transfer Protocol
RFC 0850 - Standard for Interchange of USENET Messages
RFC 0894 - A Standard for the Transmission of IP Datagrams over Ethernet Networ…
RFC 0959 - File Transfer Protocol (FTP)
RFC 0977 - Network News Transfer Protocol
RFC 1034 - Domain Names - Concepts and Facilities
RFC 1035 - Domain Names - Implementation and Specification
RFC 1036 - Standard for Interchange of USENET Messages
RFC 1149 - A Standard for the Transmission of IP Datagrams on Avian Carriers
RFC 1178 - Choosing a Name for Your Computer
RFC 1288 - The Finger User Information Protocol
RFC 1305 - Network Time Protocol (Version 3) Specification, Implementation and …
RFC 1321 - The MD5 Message-Digest Algorithm
RFC 1323 - TCP Extensions for High Performance
RFC 1350 - The TFTP protocol (revision 2)
RFC 1436 - The Internet Gopher Protocol (a distributed document search and retr…
RFC 1591 - Domain Name System Structure and Delegation
RFC 1731 - IMAP4 Authentication Mechanisms
RFC 1734 - POP3 AUTHentication command
RFC 1738 - Uniform Resource Locators (URL)
RFC 1918 - Address Allocation for Private Internets
RFC 1939 - Post Office Protocol - Version 3
RFC 1945 - Hypertext Transfer Protocol -- HTTP/1.0
RFC 1950 - ZLIB Compressed Data Format Specification version 3.3
RFC 1951 - DEFLATE Compressed Data Format Specification version 1.3
RFC 1952 - GZIP file format specification version 4.3
RFC 2045 - Multipurpose Internet Mail Extensions (MIME) Part One: Format of Int…
RFC 2046 - Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types
RFC 2047 - Multipurpose Internet Mail Extensions (MIME) Part Three: Message Hea…
RFC 2048 - Multipurpose Internet Mail Extensions (MIME) Part Four: Registration…
RFC 2049 - Multipurpose Internet Mail Extensions (MIME) Part Five: Conformance …
RFC 2109 - HTTP State Management Mechanism
RFC 2195 - IMAP/POP AUTHorize Extension for Simple Challenge/Response
RFC 2385 - Protection of BGP Sessions via the TCP MD5 Signature Option
RFC 2396 - Uniform Resource Identifiers (URI): Generic Syntax
RFC 2401 - Security Architecture for the Internet Protocol
RFC 2428 - FTP Extensions for IPv6 and NATs
RFC 2449 - POP3 Extension Mechanism
RFC 2616 - Hypertext Transfer Protocol -- HTTP/1.1
RFC 2617 - HTTP Authentication: Basic and Digest Access Authentication
RFC 2817 - Upgrading to TLS Within HTTP/1.1
RFC 2818 - HTTP Over TLS
RFC 2980 - Common NNTP Extensions
RFC 3164 - The BSD syslog Protocol
RFC 3206 - The SYS and AUTH POP Response Codes
RFC 3330 - Special-Use IPv4 Addresses
RFC 3659 - Extensions to FTP
RFC 3977 - Network News Transfer Protocol (NNTP)
RFC 4217 - Securing FTP with TLS
RFC 4266 - The gopher URI Scheme
RFC 4271 - A Border Gateway Protocol 4 (BGP-4)
RFC 4642 - Using Transport Layer Security (TLS) with Network News Transfer Prot…
RFC 4643 - Network News Transfer Protocol (NNTP) Extension for Authentication
RFC 4644 - Network News Transfer Protocol (NNTP) Extension for Streaming Feeds
RFC 4893 - BGP Support for Four-octet AS Number Space
RFC 5424 - The Syslog Protocol
Other (non-RFC) technical documentation