DNStracer – Trace DNS queries to the source

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DNStracer determines where a given Domain Name Server (DNS) gets its information from, and follows the chain of DNS servers back to the servers which know the data.

Install DNStracer on ubuntu

Open the terminal and run the following command

sudo apt-get install dnstracer

Using DNStracer

Syntax

dnstracer [options] name

Available Options

-c -- Disable local caching.

-C -- Enable negative caching.

-o -- Enable overview of received answers at the end.

-q q>u>e>r>y>c>l>a>s>s> -- Change the query-class, default is A. You can either specify a number of the type (if you're brave) or one of the following

strings: a, aaaa, a6, soa, cname, hinfo, mx, ns, txt and ptr.

-r r>e>t>r>i>e>s> -- Number of retries for DNS requests, default 3.

-s s>e>r>v>e>r> -- DNS server to use for the initial request, default is aquired from the system. If a dot is specified (.), A.ROOT-SERVERS.NET will be used.

-v -- Be verbose on what sent or received.

-4 -- use only IPv4 servers, don't query IPv6 servers (only available when IPv6 support hasn't been disabled)

-S s>o>u>r>c>e>a>d>d>r>e>s>s> -- Use this as source-address for the outgoing packets.

DNStracer Examples

Search for the A record of www.ubuntugeek.com on your local nameserver

dnstracer www.ubuntugeek.com

Search for PTR record of x.x.x.x

dnstracer "-q" ptr x.x.x.x.in-addr.arpa

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