Port
Port 110 — POP3
Port 110 (TCP) is used by POP3. Post Office Protocol v3 — downloads email from a server.
Port 110 at a glance
| Property | Value |
|---|---|
| Port number | 110 |
| Transport | TCP |
| Service | POP3 |
| Category | Well-known port |
What it is used for
Post Office Protocol v3 — downloads email from a server.
Security considerations
Clear text unless POP3S (995). Prefer IMAP over TLS.
See our full TCP/UDP port reference and learn how firewalls filter ports in the CyberOps course.
Frequently asked questions
What is port 110 used for?
Port 110 (TCP) is used by POP3. Post Office Protocol v3 — downloads email from a server.
Is port 110 TCP or UDP?
Port 110 uses TCP.
Is it safe to open port 110?
Clear text unless POP3S (995). Prefer IMAP over TLS.
Related
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