What are network ports?
A port is a number (0 to 65535) that identifies, within a given IP address, which service or application should receive a connection's data — like an "extension" within the "phone number" that is the IP. Ports 0 to 1023 are the "well-known ports", reserved for standardized services like HTTP (80), HTTPS (443) and SSH (22).
How to use it
Type a port number or a service name (e.g. "ssh", "mysql", "443") to filter the table instantly.
Frequently asked questions
What is the difference between TCP and UDP?
TCP is connection-oriented and guarantees packet delivery and order (used by HTTP, SSH, email) — more reliable but slower. UDP does not guarantee delivery or order, but is faster and lighter (used by DNS, streaming, online games).
Why is port 443 so important?
It's the standard HTTPS port (HTTP over TLS/SSL), used by nearly every secure website on the internet today — it's the port that ensures the connection between your browser and the server is encrypted.