Default Ports

A default port is a port number that is configured by default to accept internet connections and packets from specific services, using protocols like User Datagram Protocol (UDP) or Transmission Control Protocol (TCP).

For instance, to access web servers, port 80 is mostly open by default. Most devices enable HTTP Protocol communications between web servers and browsers over port 80 by default.

Some common ports and services include:

Port	Service \
21	File Transfer Protocol
22	Secure Shell
23	Telnet
25	Simple Mail Transfer Protocol
53	DNS
69	Trivial File Transfer Protocol
80	HTTP Protocol
88	Kerberos Authentication
110	Post Office Protocol
111	RPC Protocol
119	Network Time Protocol
135	Microsoft Remote Procedure Call
139/445	Server Message Block
143/993	Internet Message Access Protocol
161/162	Simple Network Management Protocol
389/636	Lightweight Directory Access Protocol
443	HTTPS Protocol
995	Post Office Protocol Secure
1433	Microsoft SQL Server
1521	Oracle Database
2049	Network File Share
3306	MySQL (KB)
3389	Remote Desktop Protocol
5900	Virtual Network Computing
8080	HTTP Protocol/Web Services