AhaBulbStuff Everyone Should Know
AhaBulb: Stuff Everyone Should Know · ahabulb.com/tech-dns-port-53

Which server port does DNS use with both UDP and TCP?

Start playing free

  1. Port 25
  2. Port 67
  3. Port 53

🔒 The answer is for AhaBulb members. Members see the answer, why it's right and the official sources for every card of Stuff Every Technology Expert Should Know, plus timed practice exams.

The first 50 cards of every test are free to play.

Play the free cards See membership

Like this card?
Play the game

References

  1. RFC 1035: Domain Names, Implementation and Specification www.rfc-editor.org/rfc/rfc1035.html Checked 2026-10-11.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

Tech & GadgetsHow can NAPT let many private hosts share one public address?Tech & GadgetsWhat may a DNS resolver receive when a server lacks the final answer?Tech & GadgetsWhat does a DNS record's TTL control?

That's stuff everyone should know.