What is the difference between TCP and UDP ports?

TCP is connection-oriented and guarantees ordered, reliable delivery, which suits web pages, email and databases. UDP is connectionless and faster but without delivery guarantees, which suits DNS lookups, time sync and streaming. Some services such as DNS use both.

What are well-known ports?

Well-known ports are the numbers from 0 to 1023 reserved by IANA for common services such as HTTP on 80 and HTTPS on 443. Ports 1024 to 49151 are registered ports, and 49152 to 65535 are dynamic or ephemeral ports used for temporary client connections.

Is anything I search sent to a server?

No. The full port list and the search both run entirely in your browser — nothing you type is uploaded anywhere.

Port Numbers Reference

Network ports — searchable reference

A grouped, searchable list of the network ports you actually run into: web (80 HTTP, 443 HTTPS), email (25, 587, 993), remote access (22 SSH, 3389 RDP), databases (3306 MySQL, 5432 PostgreSQL, 6379 Redis), plus networking and messaging services — each with its protocol and a plain-English description.

Search by port number, service name, or keyword to find the right one instantly. Everything runs in your browser; nothing is uploaded.