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DNS Root Server TCP/UDP Performance

The map below shows a comparison of response times for DNS SOA queries to all the DNS root servers.

For each probe, a marker shows the RTT to the server when using TCP and UDP. When comparing TCP to UDP, the marker shows the performance difference between the two protocols as a ratio of TCP to UDP (which, in general, is expected to be 2-3). It is possible to filter by protocol (IPv4, IPv6, or both) and by ASN.

We display measurement results from the last hour only.

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