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what is ports used for DNS service and which protocol ?

Linux Ports DNS
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Question added by Mohamed Abe Alfattah Abd Alazeem LASHIN , senior systems engineer , mobily
Date Posted: 2013/06/06
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Mohamed Abe Alfattah Abd Alazeem LASHIN
by Mohamed Abe Alfattah Abd Alazeem LASHIN , senior systems engineer , mobily

DNS use port53 , UDP for query and TCP for zone transfer

Syed Asgar Mahmood Zaidi
by Syed Asgar Mahmood Zaidi , Senior System Engineer , Royal Hospital

DNS Uses Port53 of TCP and UDP both

 

It Uses a Reliable Connection for DNS Replication update and for reliable connection is uses TCP otherwise UDP.

 

Athanassios Staveris-Polykalas
by Athanassios Staveris-Polykalas , Secretary General of Telecommunications and Post - Hellenic Republic , General Secretariat of Telecommunications and Post - Hellenic Republic

UDP protocol port53

Abdul Azeem
by Abdul Azeem , Principal Engineer , Universal Inspection Co.LTD

DNS primarily uses User Datagram Protocol (UDP) on port number53.
Transmission Control Protocol (TCP) is used when response data size exceeds512 bytes(zone transfers).

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