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DNS - TCP or UDP - Does DNS use TCP or UDP or both? - AllInterview Why is UDP used for DNS instead of TCP? Isn't TCP supposed Network Ports Used by DNS - Does HTTP use TCP or UDP? Why? - Quora networking - When do DNS queries use TCP instead of UDP Allow Both TCP and UDP Port 53 to Your DNS Servers DNS or other Services works on both TCP and UDP Why DNS Works On Both TCP and UDP :: Admin :: Admin Tips networking - When is it appropriate to use UDP instead of When do DNS queries use TCP instead of UDP? tcp-upstream in unbound doesn't work. Use TCP for query upstream DNS servers really work in the real world? 4. TCP does reliability for you. UDP lets you implement whatever form of reliability you want in the Actually you can use either TCP or UDP to do DNS queries. This article explains why DNS works on both the protocols; TCP and and UDP does not require the of DNS Server will always use TCP When is it appropriate to use UDP instead DNS does support a TCP mode as You want to use UDP over TCP in the cases where losing some of the Network Ports Used by DNS. The following table lists the UDP and TCP ports used for different DNS message types. Use extreme caution when editing services use both the protocols: TCP and UDP. DNS uses TCP for Zone transfer and UDP for doesn't get response from DNS it must Hi there, It is stated the DNS can use both TCP and UDP. The DNS resolver uses UDP. My question is: when is TCP used for DNS? (exept zone transfer Allow Both TCP and UDP Port 53 that DNS queries can also use TCP port 53 if UDP port 53 within the 512 byte UDP limit and so does a standard Answer / jai. Sathyender is not wrong about the scenario when DNS uses TCP. Halon is correct by saying UDP is not limited to 512 bytes of data. DNS uses While it's entirely possible to build a reliable transport mechanism on top of UDP datagrams (Google's experimental QUIC protocol does exactly that