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Port 110: POP3 (Post Office Protocol v3)

POP3 is an application-layer Internet standard protocol used by local email clients to retrieve email from a remote server over TCP port 110.

Protocol
TCP
Category
Email Retrieval
Common Services
Dovecot, Courier-IMAP

What is Port 110 and How Does It Work?

POP3 is an application-layer Internet standard protocol used by local email clients to retrieve email from a remote server over TCP port 110.

Security Vulnerabilities & Attack Vectors on Port 110

Plain POP3 transmits passwords in plaintext. Enforce secure POP3S over port 995.

Auditing & Scanning Port 110 with Nmap

Run the following command to check if Port 110 is reachable and determine service fingerprints:

nmap -p 110 -sV

Frequently Asked Questions

How do I check if Port 110 is open?
Use cyber-tool.org diagnostic tools or run 'nc -zv 110' in your terminal to verify open socket connections.
Is it safe to leave Port 110 open to the internet?
Exposing Port 110 (POP3 (Post Office Protocol v3)) publicly introduces potential exposure. Protect it with IP whitelisting, firewalls, and encryption.