1/13
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20/21
Protocol: FTP
Transport: TCP
Use: file transfer
22
Protocol: SSH
Transport: TCP
Use: Secure command line access
23
Protocol/ service: Telnet
Transport: TCP
Use: unsecure command line access
25
Protocol/ service: SMTP
Transport: TCP
Use: sending email
53
Protocol/ service: DNS
Transport: TCP + UDP
Use: name resolution
67/68
Protocol/ service: DHCP
Transport: UDP
Use: IP address assignment
80
Protocol/ service: HTTP
Transport: TCP
Use: web
110
Protocol/ service: POP3
Transport: TCP
Use: email retrieval
137/139
Protocol/ service: NetBIOS/NetBT
Transport: UDP (137), TCP (139)
Use: NetBIOS over TCP/IP
143
Protocol/ service: IMAP4
Transport: TCP
Use: email retrieval/ sync
389
Protocol/ service: LDAP/ LDAPS
Transport: TCP
Use: directory services
443
Protocol/ service: HTTPS
Transport: TCP
Use: secure web
445
Protocol/ service: SMB (NetBIOS-less)
Transport: TCP
Use: direct SMB communication over TCP without NetBIOS transport
3389
Protocol/ service: RDP
Transport: TCP
Use: Windows remote desktop