DNS enumeration using fierce.pl

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I have seen fierce is a powerful tool for Dns Enumeration. Often I use it for Enumerating DNS. First this tool will check that if the site allow any zone transfer or not . If the Target site does not allow Zone transfer then it will start Brute forcing using a default wordlist came with the tool. But believe it or not most of time i got very good result from this tool. Try it out yourself please!!!.

This tool is written in perl:

fierce.pl (C) Copywrite 2006,2007 – By RSnake at http://ha.ckers.org/fierce/

        Usage: perl fierce.pl [-dns example.com] [OPTIONS]

        Fierce is a semi-lightweight scanner that helps locate non-contiguous
        IP space and hostnames against specified domains.  It’s really meant
        as a pre-cursor to nmap, unicornscan, nessus, nikto, etc, since all
        of those require that you already know what IP space you are looking
        for.  This does not perform exploitation and does not scan the whole
        internet indiscriminately.  It is meant specifically to locate likely
        targets both inside and outside a corporate network.  Because it uses
        DNS primarily you will often find mis-configured networks that leak
        internal address space. That’s especially useful in targeted malware.

        -connect        Attempt to make http connections to any non RFC1918
                (public) addresses.  This will output the return headers but
                be warned, this could take a long time against a company with
                many targets, depending on network/machine lag.  I wouldn’t
                recommend doing this unless it’s a small company or you have a
                lot of free time on your hands (could take hours-days). 
                Inside the file specified the text “Host:n” will be replaced
                by the host specified. Usage:

        perl fierce.pl -dns example.com -connect headers.txt

        -delay          The number of seconds to wait between lookups.
        -dns            The domain you would like scanned.
        -dnsfile        Use DNS servers provided by a file (one per line) for
                reverse lookups (brute force).
        -dnsserver      Use a particular DNS server for reverse lookups
                (probably should be the DNS server of the target).  Fierce
                uses your DNS server for the initial SOA query and then uses
                the target’s DNS server for all additional queries by default.
        -file           A file you would like to output to be logged to.
        -fulloutput     When combined with -connect this will output everything
                the webserver sends back, not just the HTTP headers.
        -help           This screen.
        -nopattern      Don’t use a search pattern when looking for nearby
                hosts.  Instead dump everything.  This is really noisy but
                is useful for finding other domains that spammers might be
                using.  It will also give you lots of false positives,
                especially on large domains.
        -range          Scan an internal IP range (must be combined with
                -dnsserver).  Note, that this does not support a pattern
                and will simply output anything it finds.  Usage:

        perl fierce.pl -range 111.222.333.0-255 -dnsserver ns1.example.co

        -search         Search list.  When fierce attempts to traverse up and
                down ipspace it may encounter other servers within other
                domains that may belong to the same company.  If you supply a
                comma delimited list to fierce it will report anything found.
                This is especially useful if the corporate servers are named
                different from the public facing website.  Usage:

        perl fierce.pl -dns examplecompany.com -search corpcompany,blahcompany

                Note that using search could also greatly expand the number of
                hosts found, as it will continue to traverse once it locates
                servers that you specified in your search list.  The more the
        -suppress       Suppress all TTY output (when combined with -file).
        -tcptimeout     Specify a different timeout (default 10 seconds).  You
                may want to increase this if the DNS server you are querying
                is slow or has a lot of network lag.
        -threads  Specify how many threads to use while scanning (default
          is single threaded).
        -traverse       Specify a number of IPs above and below whatever IP you
                have found to look for nearby IPs.  Default is 5 above and
                below.  Traverse will not move into other C blocks.
        -version        Output the version number.
        -wide           Scan the entire class C after finding any matching
                hostnames in that class C.  This generates a lot more traffic
                but can uncover a lot more information.
        -wordlist       Use a seperate wordlist (one word per line).  Usage:

        perl fierce.pl -dns examplecompany.com -wordlist dictionary.txt

Download: http://ha.ckers.org/fierce/fierce.pl

Run: perl fierce.pl -dns yourtarget.net

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