How do I get a list of all subdomains of a domain

Question

I want to find out all the subdomains of a given domain  I found a hint which tells me to dig the authoritative Nameserver with the following option   dig  ns1 foo bar some domain com axfr   But this never works  Has anyone a better idea approach

User · Answer

dig somedomain com soa dig  ns SOA com somedomain com axfr

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You can use     host -l domain com  Under the hood  this uses the AXFR query mentioned above  You might not be allowed to do this though  In that case  you ll get a transfer failed message

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In Windows nslookup the command is  ls -d somedomain com  gt  outfile txt   which stores the subdomain list in outfile txt  few domains these days allow this

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The hint  using axfr  only works if the NS you re querying  ns1 foo bar in your example  is configured to allow AXFR requests from the IP you re using  this is unlikely  unless your IP is configured as a secondary for the domain in question   Basically  there s no easy way to do it if you re not allowed to use axfr   This is intentional  so the only way around it would be via brute force  i e  dig a some domain com  dig b some domain com        which I can t recommend  as it could be viewed as a denial of service attack

User · Answer

robotex tools which are free will let you do this but they make you enter the ip of the domain first    find out the ip  there s a good ff plugin which does this but I can t post the link cos this is my first post here   do an ip search on robotex  http   www robtex com ip  in the results page that follows click on the domain you re interested in  you are taken to a page that lists all subdomains   a load of other information such as mail server info

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If you can t get this information from DNS  e g  you aren t authorized  then one alternative is to use Wolfram Alpha     Enter the domain into the search box and run the search   E g  stackexchange com       In the 3rd section from the top  named  Web statistics for all of stackexchange com   click Subdomains      In the Subdomains section click More     You will be able to see a list of sub-domains there  Although I suspect it does not show ALL sub-domains

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If the DNS server is configured properly  you won t be able to get the entire domain   If for some reason is allows zone transfers from any host  you ll have to send it the correct packet to make that request   I suspect that s what the dig statement you included does

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You can only do this if you are connecting to a DNS server for the domain -and- AXFR is enabled for your IP address  This is the mechanism that secondary systems use to load a zone from the primary  In the old days  this was not restricted  but due to security concerns  most primary name servers have a whitelist of  secondary name servers   a couple special systems   If the nameserver you are using allows this then you can use dig or nslookup   For example    nslookup   gt ls domain com   NOTE  because nslookup is being deprecated for dig and other newere tools  some versions of nslookup do not support  ls   most notably Mac OS X s bundled version

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You can use this site to find subdomains Find subdomains  This tool will try a zone transfer and also query search engines for list of subdomains

[dns] How do I get a list of all subdomains of a domain?

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