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Commonly Used Well-Known Ports

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coffeejoe's version from 2015-06-22 14:48

Section

Question Answer
FTP – File Transport Protocol Data20
FTP – File Transport Protocol Control21
SSH – Secure Shell22
SFTP – Secure File Transport Protocol (uses SSH)22
SCP – Secure Copy (uses SSH)22
Telnet23
SMTP – Simple Mail Transport Protocol25
TACACS – Terminal Access Controller Access-Control System49
DNS – Domain Name System53
DHCP – Dynamic Host Configuration Protocol67-68
TFTP – Trivial File Transport Protocol69
HTTP – Hypertext Transfer Protocol80
Kerberos88
POP3 – Post Office Protocol version 3110
SFTP - Simple File Transfer Protocol115
NNTP – Network News Transfer Protocol119
NTP - Network Time Protocol123
NetBIOS - Network Basic Input/Output System137 - 139
IMAP4 – Internet message access protocol version 4143
SNMP – Simple Network Management Protocol161
SNMP Trap – Simple Network Management Protocol Trap162
LDAP – Lightweight Directory Access Protocol (unencrypted)389
HTTPS – Hypertext Transfer Protocol Secure443
SSL VPN – Secure Sockets Layer virtual private network443
IPSec - Internet Protocol Security500
ISAKMP (VPN) – Internet Security Association and Key Management Protocol (virtual private network)500
Syslog514
LDAP – Lightweight Directory Access Protocol (encrypted)636
TLS - Transport Layer Security636
FTPS - FTP Secure Data989
FTPS - FTP Secure Control990
L2TP – Layer 2 Tunneling Protocol1701
PPTP – Point-to-Point Tunneling Protocol1723
RDP – Remote Desktop Protocol3389
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