What is a port number?
GeneralClass 10CBSEAnswered 25 May 2026
Answer
A port number lets your computer handle many types of network communication simultaneously by labelling each type with a number.
Your IP address is like a building's street address. Port numbers are like apartment numbers they tell the operating system which program should receive incoming data.
Common standardised ports:
- Port 80: regular web (HTTP)
- Port 443: secure web (HTTPS)
- Port 22: SSH (remote access)
- Port 25: email (SMTP)
- Port 3306: MySQL database
Port numbers range from 0 to 65,535. Ports below 1024 are reserved for well-known services.
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