Hi, I have a following question. Please someone teach me. RFC2400(INTERNET OFFICIAL PROTOCOL STANDARDS) describes a status like Req or Rec for each Protocol but RFC2500 does NOT describe status. RFC2500 obsoletes RFC2400. What RFC describes a status for each protocol? Where can I find status description for each protocol? Thanks, Masao part of RFC2400 is as follows -------------------------------------------------------------------- Internet Architecture Board Standards Track [Page 20] RFC 2400 Internet Standards September 1998 6.2. Standard Protocols Protocol Name Status RFC STD * ======== ===================================== ======== ==== === = -------- Internet Official Protocol Standards Req 2400 1 -------- Assigned Numbers Req 1700 2 -------- Host Requirements - Communications Req 1122 3 -------- Host Requirements - Applications Req 1123 3 IP Internet Protocol Req 791 5 as amended by:-------- -------- IP Subnet Extension Req 950 5 -------- IP Broadcast Datagrams Req 919 5 -------- IP Broadcast Datagrams with Subnets Req 922 5 ICMP Internet Control Message Protocol Req 792 5 IGMP Internet Group Multicast Protocol Rec 1112 5 UDP User Datagram Protocol Rec 768 6 TCP Transmission Control Protocol Rec 793 7 TELNET Telnet Protocol Rec 854,855 8 FTP File Transfer Protocol Rec 959 9 SMTP Simple Mail Transfer Protocol Rec 821 10