Ports and Services

Service Port
FTP (Data) TCP 20
FTP (Connection / Command / Control) TCP 21
Telnet 23
SMTP (Outgoing E-mail) TCP 25
TACACS / TACACS+ TCP/UDP 49
DNS (Queries) UDP 53
DNS (Zone Transfer) TCP 53
TFTP UDP 69
HTTP TCP 80
Kerberos 88
POP3 – Incoming E-mail (No SSL) TCP 110
NTP (Network Time Protocol) UDP 123
IMAP TCP 143
SNMP (Version 3 most secure, only use this version) 161
LDAP (Non-Secure) 389
SSL and HTTPS TCP 443
LDAP (Secure) 636 (Secured with SSL or TLS)
POP3 – Incoming E-mail (SSL Encrypted) 995
MS-SQL Database 1433
RADIUS (Authentication) UDP 1812
RADIUS (Accounting) UDP 1813
RDP TCP 3389
IRC 6667

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