Port 110 — POP3
TCP · Port 110/TCP is used for the Post Office Protocol version 3 (POP3), a protocol that allows email clients to retrieve email from a mail server. POP3 is commonly used by users who access their email from multiple devices or locations, as it enables them to download and manage their email messages remotely. This port is critical in network security as it provides a means for attackers to gain unauthorized access to user email accounts.
- Port Number
- 110
- Service Name
- POP3
- Protocol
- TCP
- Common Software
- Dovecot, Courier
Security Notes
Review IANA registry for port 110 usage. Apply principle of least privilege - only open ports that are required.
FAQ
Port 110 is used for POP3. Port 110/TCP is used for the Post Office Protocol version 3 (POP3), a protocol that allows email clients to retrieve email from a mail server. POP3 is commonly used by users who access their email from multiple devices or locations, as it enables them to download and manage their email messages remotely. This port is critical in network security as it provides a means for attackers to gain unauthorized access to user email accounts. Common software: Dovecot, Courier.
Review IANA registry for port 110 usage. Apply principle of least privilege - only open ports that are required.
Use nmap: nmap -p 110 <target> or check locally: ss -tlnp | rg 110