๐ Port Number Reference
65 ports
A searchable reference of common TCP/UDP port numbers โ HTTP, SSH, DNS, and more โ along with what each one is used for. Handy for network configuration, checking firewall rules, or studying for a networking certification.
How to use
- Type a port number (e.g. 443), service name (e.g. SSH), or protocol into the search box.
- The list filters in real time as you type.
- Click any row to copy the port number or details.
How the calculation works
A port number, from 0 to 65535, tells a computer which program (service) incoming traffic is for. If an IP address is the address of a building, the port is the room number. Assignments are managed by IANA (the Internet Assigned Numbers Authority) and fall into three ranges. 0โ1023 are the well-known ports, used for fundamental services such as HTTP (80), HTTPS (443) and SSH (22). 1024โ49151 are registered ports, and 49152โ65535 are dynamic or private ports, used temporarily for individual connections. TCP confirms delivery and keeps data in order; UDP skips the confirmation in favour of speed. The same number is treated separately for TCP and UDP, and some services, such as DNS (53), use both.
Worked example
Searching for "443" The result is HTTPS (TCP). Addresses beginning "https://" connect to port 443 unless another port is specified. If an SSH connection to a server fails, check whether the firewall allows port 22 (TCP).
Things to be aware of
- The list covers common ports; it is not every assignment.
- Port assignments are conventions โ a server can be configured to use a different number.
- Opening a port in a firewall allows outside connections. Open only the ports you need.
- For the current official assignments, see the IANA registry.
FAQ
Which ports are included?
Widely used ports such as HTTP (80), HTTPS (443), SSH (22), DNS (53), and many other common services.
Can I search by service name as well as port number?
Yes โ search by number (e.g. 443) or by service name (e.g. SSH).
Is this useful for setting up firewall rules?
Yes โ it's a quick reference for what each port is used for while deciding which ports to open or block.
Can I check whether a port is TCP or UDP?
Yes โ the list shows which protocol (or both) each port typically uses.
Is it useful for studying for a networking exam?
Yes โ it's a fast way to review common port-to-service mappings while studying for networking certifications.