Common Ports and Protocols
Port Number TCP/UDP Protocol Sample Server Programs
20 & 21 TCP FTP ProFTPd, WU FTPd
22 TCP SSH OpenSSH, lsh
23 TCP Telnet in.telnetd
25 TCP SMTP sendmail, Postfix, Exim, qmail
53 TCP & UDP DNS BIND
67 UDP DHCP DHCP
69 UDP TFTP in.tftpd
80 TCP HTTP Apache, httpd
88 TCP Kerberos MIT Kerberos, Heimdal
109 & 110 TCP POP (versions 2 & 3) UW IMAP
111 TCP &UDP Portmapper NFS, NIS, etc
113 TCP auth/ident identd
119 TCP NNTP INN,Leafnode
123 UDP NTP NTP
137 UDP NetBIOS Samba
138 UDP NetBIOS Samba
139 TCP NetBIOS Samba
143 TCP IMAP 2 UW IMAP
177 UDP XDMCP XDM, KDM, GDM
220 TCP IMAP 3 UW IMAP
389 TCP LDAP OpenLDAP
443 TCP HTTPS Apache
445 TCP Microsoft DS Samba
514 UDP Syslog syslogd
515 TCP Spooler BSD LPD, LPRng, cups-lpd
636 TCP LDAPS OpenLDAP
749 TCP Kerberos MIT Kerberos, Heimdal
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