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SESK: Stuff Everyone Should Know · sesk.info/aplus-pop3-port

Which port does POP3 use by default to download email?

Port 110 is the default for POP3.

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  1. 143
  2. 25
  3. 110 ✔

Why: POP3 (Post Office Protocol 3) is registered to port 110. IMAP is 143 and SMTP is 25. POP3 pulls mail down to your device.

Huh, didn't know that: The IANA entry names port 110 'Post Office Protocol - Version 3'.

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What do you get when you cross unwanted junk messages with a Dr. Seuss book? Green Eggs and Spam.
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References

Answer: 110. POP3 (Post Office Protocol 3) is registered to port 110. IMAP is 143 and SMTP is 25. POP3 pulls mail down to your device.

  1. IANA Service Name and Transport Protocol Port Number Registry CSV www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv
    pop3,110,tcp,Post Office Protocol - Version 3
    Checked 2026-10-11.

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