21
FTP- file transfer protocol
22
SSH- Secure Shell
23
Telnet- terminal network
25
SMTP- simple mail transfer protocol
53
DNS- domain name system
80
HTTP- hypertext transfer protocol
88
Kerberos
110
POP3- post office protocol version 3
119
NNTP- network news transfer protocol
137-139
NetBIOS- NetBIOS name, datagram, and session services
143
IMAP- internet access message protocol
161
SNMP- simple network management protocol
389
LDAP- lightweight directory access protocol
443
HTTPS- hypertext transfer protocol secure
445
SMB- server message block
1701
L2TP- layer 2 tunneling protocol
1723
PPTP- point-to-point tunneling protocol
3389
RDP- remote desktop protocol (Microsoft terminal server)