File Transfer Protocol (FTP) - Data
Port 20; TCP
File Transfer Protocol (FTP) - Control
Port 21; TCP
Secure Shell (SSH) / Secure Copy Protocol (SCP)
Port 22; TCP
Telnet
Port 23; TCP
Simple Mail Transfer Protocol (SMTP)
Port 25; TCP
Terminal Access Controller Access Control System (TACACS) / TACACS+
Port 49; TCP
Domain Name Service (DNS)
Port 53; TCP for Zone Transfer / UDP for Requests
Dynamic Host Configuration Protocol (DHCP)
Server: Port 67; TCP
Client: Port 68; UDP
Trivial File Transfer Protocol (TFTP)
Port 69; UDP
Hyper Text Transfer Protocol (HTTP)
Port 80; TCP
Kerberos
Port 88; TCP
Post Office Protocol version 3 (POP3)
Port 110; TCP
Secured File Transfer Protocol (SFTP)
Port 115; TCP
Network News Transfer Protocol (NNTP)
Port 119; TCP
Network Time Protocol (NTP)
Port 123; UDP
Network Basic Input/Output System (NetBIOS)
Name Service: Port 137; TCP/UDP
Datagram Service: Port 138 UDP
Session Service: Port 139 TCP
Internet Message Access Protocol version 4 (IMAP4)
Port 143; TCP
Simple Network Management Protocol (SNMP)
Port 161/162; UDP
Lightweight Directory Access Protocol (LDAP) - Unencrypted
Port 389; TCP/UDP
Hyper Text Transfer Protocol Secure (HTTPS)
Port 443; TCP
Simple Mail transfer Protocol Secure (SMTPS)
Port 465; TCP
Internet Key Exchange (IKE) w/ IPSec
Port 500; UDP
Syslog
Port 514; UDP
Lightweight Directory Access Protocol (LDAP) - Encrypted
Port 636; TCP/UDP
File Transfer Protocol Secure (FTPS)
Data: Port 989; TCP/UDP
Control: Port 990; TCP/UDP
Telnet over SSL/TLS
Port 992; TCP/UDP
Internet Message Access Protocol (IMAP) over SSL/TLS
Port 993; TCP
Post Office Protocol version 3 (POP3) over SSL/TLS
Port 995; TCP
Layer 2 Tunneling Protocol (L2TP)
Port 1701; UDP
Point-to-Point Transfer Protocol (PPTP)
Port 1723; TCP/UDP
Remote Authentication Dial-In User Service (RADIUS)
Port 1812/1813; TCP/UDP
Remote Desktop Protocol (RDP)
Port 3389; TCP
Diameter base
Port 3868; TCP/SCTP
Session Initiation Protocol (SIP)
Port 5060; TCP/UDP
Session Initiation Protocol Secure (SIPS) over TLS
Port 5061; TCP
SYSLOG over TLS
Port 6514; TCP