Common TCP and UDP Ports

Question 1

TCP Ports

Answer 1

• 21: FTP
• 22: SSH / SFTP
• 23: Telnet
• 25: SMTP
• 53: DNS for zone transfers
• 80: HTTP
• 110: POP3
• 111: RPCBIND (Maps remote procedure call services to ports, dead giveaway server is running a Unix environment)
• 135: MSRPC (Remote pocedure call services for Windows)
• 139: NetBIOS-SSN (Windows file sharing with pre-Windows 2000 hosts)
• 143: IMAP
• 443: HTTPS
• 445: Microsoft-ds (Windows file sharing over SMB on current Windows networks)
• 993: IMAPS
• 995: POP3S
• 1723: PPTP (Point-to-point tunneling protocl, deprecated VPN protocl with weak security)
• 3306: MySQL
• 3389: RDP
• 5900: VNC (Virtual network computing remote access service, open source, all systems)
• 8080: HTTP-PROXY (Web proxy or alt port for HTTP)

Question 2

UDP Ports

Answer 2

• 53: DNS for queries
• 67: DCHPS (Server)
• 68: DHCPC (Client)
• 69: TFTP (Trivial file transfer protocol)
• 123: NTP
• 135: MSRPC (Advertises what RPC services are available in a Windows environment)
• 137: NetBIOS-NS (NetBIOS Name Service, supports Windows file sharing with pre-Windows 2000 version hosts)
• 138: NetBIOS-DGM (NetBIOS Datagram Service, supports Windows file sharing with pre-Windows 2000 version hosts)
• 139: NetBIOS-SSN (NetBIOS Session Service, supports Windows file sharing with pre-Windows 2000 version hosts)
• 161: SNMP (Agent port for simple network management protocol)
• 162: SNMP (Management station port for receiving SNMP trap messages)
• 445: Microsoft-DS (Supports Windows file sharing over SMB on current Windows networks)
• 500: ISAKMP (Internet Security Association and Key Management Protocol, used to set up IPSec tunnels)
• 514: Syslog
• 520: RIP (Routing information protocol)
• 631: IPP (Internet printing protocol)
• 1434: MS-SQL (Microsoft SQL Server)
• 1900: UPNP (Universal plug and play)
• 4500: NAT-T-IKE (Network address translation to internet key exchange)