Packages 
Package Description
examples  
org.apache.commons.net
Common socket classes and protocol command utility classes
org.apache.commons.net.bsd
Classes for rcommand, rexec, rlogin
org.apache.commons.net.chargen
Chargen over TCP and UDP
org.apache.commons.net.daytime
Daytime over TCP and UDP
org.apache.commons.net.discard
Discard over TCP and UDP
org.apache.commons.net.echo
Echo over TCP and UDP
org.apache.commons.net.finger
Finger implementation
org.apache.commons.net.ftp
FTP and FTPS support classes
org.apache.commons.net.ftp.parser
FTP file listing parser classes
org.apache.commons.net.imap
Basic IMAP and IMAPS support classes
org.apache.commons.net.io
Utility classes for IO support.
org.apache.commons.net.nntp
NNTP - network news transfer protocol
org.apache.commons.net.ntp
NTP - network time protocol
org.apache.commons.net.pop3
POP3 and POP3S mail
org.apache.commons.net.smtp
SMTP and SMTPS mail
org.apache.commons.net.telnet
Telnet implementation
org.apache.commons.net.tftp
TFTP cliemt implementation
org.apache.commons.net.time
Time protocol (RFC 868) over TCP and UDP
org.apache.commons.net.util
Utility classes
org.apache.commons.net.whois
Whois client