About the Port Number Lookup
Network traffic is addressed to a computer and to a port on it, a number that selects which program receives the data. Many services have well-known default ports: 80 for web pages, 443 for secure web pages, 22 for SSH. This lookup lists 71 common ports with the service and the protocol. Search for a port number or a name, or leave the box empty to see them all. Type a port number or a service name and the port numbers appears at once, with a few related figures underneath, and you can copy the result with one tap. The sums run in your browser, so nothing you enter is uploaded.
Updated October 2026
How to use the Port Number Lookup
- 1Enter a port number or a service name.
- 2Pick the units or options from the menus if the port numbers tool offers them.
- 3Read the port numbers in the large result box.
- 4Look at the extra rows for related figures.
- 5Press Copy result to keep the answer.
When you need the port numbers
System administrators use it when they set up firewalls and routers, developers when they connect to databases and services, and security staff when they read a scan report. It also answers the everyday question of what an unknown open port is.
The numbers are defaults. A service can run on any port, and many servers use unusual ones for safety or because the usual one is taken. An open port also does not tell you what program is really behind it.
How the port numbers is worked out
A port is a number from 0 to 65,535. Ports 0 to 1,023 are well known, 1,024 to 49,151 are registered and the rest are dynamic or private. Port 443 is HTTPS, port 22 is SSH and SFTP, port 3306 is MySQL and MariaDB, port 5432 is PostgreSQL, port 6379 is Redis and port 27017 is MongoDB. Port 53 is DNS and uses both TCP and UDP. Port 123 is NTP time over UDP.
Every answer on this page comes from that one rule, so you can check any result by hand with a calculator. The figures shown underneath, such as other units, are conversions of the same answer.
- 71 common ports
- Protocol shown
- Search by number or name
Mistakes to avoid with port numbers
Opening a port in a firewall exposes the service to the network, so open only what you need and keep the software updated. Do not scan networks that you do not own or have permission to test. The list does not claim to be complete.
On phone and computer
On a phone, type into the boxes one after another and read the port numbers underneath; Copy result puts it on the clipboard for a message or a note. On a computer the inputs sit on the left and the answer on the right, so you can change one figure and watch the port numbers move. The port number lookup works the same on both. A port is one part of a network address. Work with the address using the IP Address Converter, plan networks with the IP Subnet Calculator, and read server replies with the HTTP Status Code Lookup.
Features
- Defaults can change
- Open only what you need
- TCP vs UDP
- Clear messages when the port numbers inputs make no sense
- Copy the result with one tap
- Private: nothing is uploaded
Frequently asked questions
How do I calculate port numbers?
A port is a number from 0 to 65,535. Ports 0 to 1,023 are well known, 1,024 to 49,151 are registered and the rest are dynamic or private. Port 443 is HTTPS, port 22 is SSH and SFTP, port 3306 is MySQL and MariaDB, port 5432 is PostgreSQL, port 6379 is Redis and port 27017 is MongoDB. Port 53 is DNS and uses both TCP and UDP. Port 123 is NTP time over UDP.
What is the formula for port numbers?
A port is a number from 0 to 65,535. Ports 0 to 1,023 are well known, 1,024 to 49,151 are registered and the rest are dynamic or private. The port number lookup applies it exactly and rounds only the displayed answer to six significant figures.
What is the difference between TCP and UDP?
TCP is reliable and ordered, used for web pages and mail. UDP is lighter and faster, used for DNS, video calls and games.
Why do some ports have two numbers like 8080 and 8443?
They are alternatives to 80 and 443, often used by development servers and proxies.
What is port 0?
A reserved port. It is not used for normal traffic.
Is this port number lookup free and private?
Yes. It is free, needs no account and runs in your browser, so the numbers you type are not uploaded or stored.