Listing 1: /etc/services

#
# Network Application Services
#
# Service       Port Number/Transport Layer
echo            7/tcp
echo            7/udp
systat          11/tcp          users
daytime         13/tcp
daytime         13/udp
netstat         15/tcp
ftp             21/tcp
telnet          23/tcp
smtp            25/tcp          mail
time            37/tcp          timserver
time            37/udp          timserver
whois           43/tcp          nicname
domain          53/tcp          nameserver
domain          53/udp          nameserver
tftp            69/udp
rje             77/tcp          netrjs
finger          79/tcp
link            87/tcp          ttylink
hostnames       101/tcp         hostname
pop             109/tcp         postoffice
nntp            119/tcp         readnews untp
ntp             123/tcp
ntp             123/udp
snmp            161/udp
snmp-trap       162/udp
#
# UNIX specific services
#
exec            512/tcp
login           513/tcp
who             513/udp         whod
shell           514/tcp         cmd
syslog          514/udp
printer         515/tcp         spooler
talk            517/udp
ntalk           518/udp
route           520/udp         router routed
timed           525/udp         timeserver