Printable Common Ports Reference
Free printable common network ports reference at exact scale — well-known TCP and UDP service ports grouped by function, on one page.
This common ports reference lists the well-known TCP and UDP port numbers grouped by function — web (80, 443), email (25, 465, 587, 110, 995, 143, 993), remote access (22, 23, 3389, 5900), file transfer and sharing, DNS and directory services, databases (3306, 5432, 1433, 1521, 27017, 6379) and infrastructure services (DHCP, NTP, SNMP, syslog).
It's the reference every sysadmin and network student wants pinned to the wall, and it prints at exact scale in real millimetres on A4, Letter or any size.
Printing at exact scale
Every sheet is drawn in real millimetres and prints at exact physical scale. For accurate output, set Scale = 100% (Actual size) and Margins = None in your browser's print dialog. Not sure your printer is honest? Run the printer ruler test first to confirm 50 mm really measures 50 mm.
Frequently asked questions
Which ports are listed?
The well-known and commonly used registered ports across web, email, remote access, file, naming/directory, database, infrastructure and messaging services.
Are these TCP or UDP?
Both — each entry notes the protocol (TCP, UDP or both) alongside the port number and service.
Is it really free?
Yes. Every template on printsheet.io is completely free, with no sign-up, no account and no watermark. Generate as many sheets as you like.
How do I get an exact-scale print?
Choose your paper size, then in the print dialog set Scale to 100% or “Actual size” and Margins to None. The sheet is defined in real millimetres, so it prints at true size. Use the calibration ruler page to verify.
Which paper sizes are supported?
A4, A5, A3, A6, US Letter, Legal and Tabloid, in portrait or landscape. Pick the size that matches the paper loaded in your printer.
Can I save it as a PDF instead of printing?
Yes — choose “Save as PDF” as the printer in your browser's print dialog. The PDF keeps the exact millimetre dimensions.