109
POP2
Medium RiskTCP — Email
Port Overview
Port Number
109
Service Name
POP2
Transport Protocol
TCP
Category
Email
Security Risk
Medium
Port Range
Well-Known (0-1023)
What is Port 109?
POP2 (Post Office Protocol version 2) is the predecessor to POP3, defined in RFC 937. It is completely obsolete; all modern email clients use POP3 (port 110) or IMAP (port 143).
TCP
Email
Security Considerations
Port 109 (POP2) is classified as medium risk. While this service is commonly exposed, consider using encrypted alternatives where available.
Recommendation: Keep the service updated. Monitor logs for unusual activity.