Intel ER8100STUS - Express 8100 Router, Reference Manual

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Reference.bok : AppendixB 119 Wed Apr 22 10:58:08 1998
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Appendix B
TCP and UDP Port Numbers
Introduction
Ports are used by the Transport Control Protocol (TCP) and User Data Protocol
(UDP) to name the ends of logical connections which carry long-term associa-
tions. For the purpose of providing services to unknown callers, a service contact
port is defined. The following list specifies the ports used by the server process
as its contact port. The contact port is sometimes called the ‘well-known port’.
The assigned ports use a small portion of the possible port numbers. The as-
signed ports have all bits set to zero except the low-order eight bits
Port assignments
The following table provides an extract of RFC 1700 of the most-used port num-
bers—low-order eight bits of the port are specified. Additional port numbers are
listed in RFC 1700.
Decimal Keyword Protocol Description
20 FTP-DATA TCP File Transfer [Default Data]
21 FTP TCP File Transfer [Control]
23 TELNET TCP Telnet
25 SMTP TCP Simple Mail Transfer Protocol
49 LOGIN TCP Login Host Protocol
53 DNS TCP /
UDP Domain Name Service
63 VIA-FTP TCP VIA Systems—FTP
67 BOOTPS UDP Bootstrap Protocol Server
68 BOOTPC UDP Bootstrap Protocol Client
69 TFTP UDP Trivial File Transfer
70 Gopher TCP Gopher file service.
80 WWW TCP World Wide Web services.
161 SNMP UDP Simple Network Management Protocol.