Network Port Number Lookup
Look up common network ports. Search by port number or service name to find the protocol (TCP, UDP or both), the service that uses it and a short description.
How to look up a port number
- Type a port number like 443 or a service name like SSH.
- Read the protocol column to see TCP, UDP or both.
- Use the description to confirm the service.
Examples
What runs on port 443?
443
HTTPS over TCP (secure web)
Which port does SSH use?
ssh
Port 22, TCP
Frequently asked questions
What port does HTTPS use?
HTTPS uses TCP port 443 by default. Plain HTTP uses TCP port 80.
What is the difference between well-known and registered ports?
Well-known ports are 0 to 1023 and are reserved for core services. Registered ports are 1024 to 49151 and are assigned to specific applications. Ports 49152 and above are dynamic or private.
Why does DNS use both TCP and UDP?
DNS uses UDP port 53 for most queries because it is fast and lightweight, and TCP port 53 for larger responses such as zone transfers.
What ports do databases use?
Common defaults are MySQL 3306, PostgreSQL 5432, Microsoft SQL Server 1433, MongoDB 27017, Redis 6379 and Oracle 1521.
Can I change a service to use a different port?
Yes. These are conventional defaults, not hard rules. Many services let you bind to a custom port, which can reduce automated scanning noise.
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