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Most common services and their ports (all TCP unless stated otherwise):

Port(s) Service
21 FTP
22 SSH
23 Telnet
25 SMTP (mail)
587 secure SMTP
53 (UDP) DNS
67 (UDP) and 68 (UDP) DHCP
69 (UDP) TFTP
80 HTTP
443 HTTPS
110 POP3 (mail)
111 ONC RPC
143 IMAP (mail)
161 (UDP) SNMP
139 and 445 SMB
1433 MSSQL
1978 WiFi Mouse
2049 NFS
3306 MySQL
3389 Windows Remote Desktop (RDP)
5900 VNC
5985 WinRM HTTP
5986 WinRM HTTPS

Most common Active Directory (AD) services and their ports:

Port(s) Service
53 DNS
88 Kerberos Authentication
135 WMI RPC
138, 139, and 445 SMB
389 LDAP
636 LDAPS
5355 LLMNR
8530 and 8531 WSUS

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