Which port does the Post Office Protocol Version 3 (POP3) make use of?

The correct answer is A. 110. POP3 uses TCP port 110 for unencrypted communication. The other ports listed serve different protocols: port 109 was used by the older POP2 standard, port 139 is used by NetBIOS Session Service (Windows file/printer sharing), and port 119 is used by NNTP (Network News Transfer…

Submitted by emma.c· Apr 18, 2026Network and Communications Security

Question

Options

A110
B109
C139
D119

How the community answered

(20 responses)

A
90% (18)
B
5% (1)
C
5% (1)

Explanation

POP3 uses TCP port 110 for unencrypted communication. The other ports listed serve different protocols: port 109 was used by the older POP2 standard, port 139 is used by NetBIOS Session Service (Windows file/printer sharing), and port 119 is used by NNTP (Network News Transfer Protocol) for Usenet newsgroups. POP3 over SSL/TLS (POP3S) uses port 995.

Topics

#POP3#Port numbers#Network protocols

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