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.
dnsip(1), dnsipq(1), dnsmx(1), dnstxt(1), dnsqr(1), dnsq(1),
dnsname(1), less(1), tinydns-get(1)