Port
Port 143 — IMAP
Port 143 (TCP) is used by IMAP. Internet Message Access Protocol — reads email kept on the server.
Port 143 at a glance
| Property | Value |
|---|---|
| Port number | 143 |
| Transport | TCP |
| Service | IMAP |
| Category | Well-known port |
What it is used for
Internet Message Access Protocol — reads email kept on the server.
Security considerations
Clear text unless IMAPS (993). Always use TLS.
See our full TCP/UDP port reference and learn how firewalls filter ports in the CyberOps course.
Frequently asked questions
What is port 143 used for?
Port 143 (TCP) is used by IMAP. Internet Message Access Protocol — reads email kept on the server.
Is port 143 TCP or UDP?
Port 143 uses TCP.
Is it safe to open port 143?
Clear text unless IMAPS (993). Always use TLS.
Related
Learn networking hands-on
Master IP addressing, subnetting and Cisco configuration on real lab devices with placement support at Attila Technologies, Ahmedabad.