Ports That Are Commonly Targeted By Hackers

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Common ports, such as TCP port 80 (HTTP), may be locked down — but other ports may get overlooked and be vulnerable to hackers. In your security tests, be sure to check these commonly hacked TCP and UDP ports:

TCP port 21 – FTP (File Transfer Protocol)

TCP port 22 – SSH (Secure Shell)

TCP port 23 – telnet

TCP port 25 – SMTP (Simple Mail Transfer Protocol)

TCP and UDP port 53 – DNS (Domain Name System)

TCP port 443 – HTTP (Hypertext Transport Protocol) and HTTPS (HTTP over SSL)

TCP port 110 – POP3 (Post Office Protocol version 3)

TCP and UDP port 135 – Windows RPC

TCP and UDP ports 137–139 – Windows NetBIOS over TCP/IP

TCP port 1433 and UDP port 1434 – Microsoft SQL Serve