services - available services

The file contains information about the services. Each entry for a service consists of a line in the following format:

service_name  port_number/protocol  aliases  #comment

Example

tcpmux     1/tcp
echo       7/tcp
echo       7/udp
telnet     23/tcp
smtp       25/tcp     mail
snmp       161/udp                 # network management agent
login      513/udp                 # Xerox NS IDP
nfsd       2049/udp                # NFS server daemon
xserver    6000/tcp                # X-Window server display

This file is static to a large degree since most of the numbers are standardized. However, free numbers can be assigned in local networks.