SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/aplus-dhcp-server-port

Which port number does a DHCP server listen on?

Port 67 for the server, and port 68 for the client.

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  1. 68
  2. 53
  3. 67 ✔

Why: DHCP servers use port 67, the old Bootstrap Protocol server port. Clients use port 68. DNS is 53, so do not mix them up.

Huh, didn't know that: The IANA registry names port 67 'Bootstrap Protocol Server' and port 68 'Bootstrap Protocol Client'.

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References

Answer: 67. DHCP servers use port 67, the old Bootstrap Protocol server port. Clients use port 68. DNS is 53, so do not mix them up.

  1. IANA Service Name and Transport Protocol Port Number Registry CSV www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv
    bootps,67,udp,Bootstrap Protocol Server
    Checked 2026-10-11.
  2. IANA Service Name and Transport Protocol Port Number Registry CSV www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv
    bootpc,68,udp,Bootstrap Protocol Client
    Checked 2026-10-11.

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