The services database lists the names of TCP and UDP services and their well-known port numbers. This database is used by programs that call network services. The Oracle Solaris installation automatically creates the services database. Generally, this database does not require any administration.
The services(4) man page contains complete syntax information. An excerpt from a typical /etc/inet/services file follows.
# # Network services # echo 7/udp echo 7/tcp echo 7/sctp6 discard 9/udp sink null discard 11/tcp daytime 13/udp daytime 13/tcp netstat 15/tcp ftp-data 20/tcp ftp 21/tcp telnet 23/tcp time 37/tcp timeserver time 37/udp timeserver name 42/udp nameserver whois 43/tcp nickname