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dnstracesort - Online in the Cloud

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This is the command dnstracesort that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



dnstrace - dns lookup tool


dnstrace t fqdn r


dnstrace searches for all DNS servers that can affect the resolution of records of type t
under the domain name fqdn, starting from the root server r. You can list more than one
root server.

dnstrace uses the standard DNS resolution algorithm, but follows all possible paths in the
algorithm. It prints all responses it receives from DNS servers; it also prints warnings
about slow servers, dead servers, misdelegated (``lame'') servers, and misformatted
packets. dnstrace is similar in spirit to DOC and dnswalk but is much more effective than
those tools at debugging resolution problems.

In versions 1.03 and above: You can pipe dnstrace through dnstracesort(1) for human-
friendly output. dnstrace can take a long time to run, so standard procedure is to save
its output in a file:

dnstrace any www.aol.com a.root-servers.net > AOL &

Then you can run dnstracesort(1) to see the results so far:

dnstracesort < AOL | less

The dnstracesort(1) output uses ul codes for boldface and underline; these codes are
displayed properly by less(1).

Beware that, as of January 2001, dnstrace produces more than 5 megabytes of output for the
complete trace of cr.yp.to starting from all the root servers. It ends up sending more
than 6000 queries to more than 200 different servers.

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