DNSCewl
A DNS Bruteforcing Wordlist Generator.
| Argument | Description |
|---|---|
| (stdin) | Specify a list of targets |
| -t | Specify a single target. |
| -tL | Specify a list of targets. |
| -sL | Specify a list of sets to substitue with |
| -eL | Specify a list of targets to exclude |
| -eX | Specify a list of domain extensions to substitute with |
| -a | Specify a file of words to append to a host |
| -p | Specify a file of words to prepend to a host |
| -v | If set then verbose output will be displayed in the terminal |
| -i | If set, original domains (from source files) are included in the output. |
| --range | Set a higher range for integer permutations. |
| --subs | If set then only subdomains will be generated. |
| --no-color | If set then any foreground or background colours will be stripped out |
| --limit | Specify a fixed word limit to output. |
| --level | Specify the level of results to output. |
| --no-repeats | Prevent repeated structures such as one.one.com |
Level
There are multiple levels of changes that can be performed, specified by "-level". A level of "1" or above modifies the results to use a - as well as everything else. A level of 0 wouldn't use -. Level defaults to level 1.
At level 2 integer substituions start to take place, using a set range.
Append
Append works by adding a new subdomain, as well as the word with a - and without (unless level is 0). So, for example:
A target list of:
example.com
help.example.com
With an append list of:
dev
test
With command line as:
DNSCewl -tL targets.txt -a append.txt
Would provide the output:
example-dev.com
example-test.com
help-dev.example.com
help-test.example.com
example.dev.com
example.test.com
help.dev.example.com
help.test.example.com
If the flag --subs was passed then this would limit results to new subdomains only, and output the following:
dev.example.com
devhelp.example.com
dev-help.example.com
dev.help.example.com
test.example.com
testhelp.example.com
test-help.example.com
test.help.example.com
Prepend
Prepend is the same as append, but at the beginning of a domain (or subdomain).
Using as:
DNSCewl -tL targets.txt -p append.txt
Would result in:
devexample.com
dev-example.com
dev.example.com
devhelp.example.com
dev-help.example.com
dev.help.example.com
testexample.com
test-example.com
test.example.com
testhelp.example.com
test-help.example.com
test.help.example.com
Level Usage Example
If level 1 was spefied, results with - wouldn't be used. For example:
DNSCewl -tL targets.txt -p append.txt --level=0
Would result in:
devexample.com
dev.example.com
devhelp.example.com
dev.help.example.com
testexample.com
test.example.com
testhelp.example.com
test-help.example.com
test.help.example.com
Subs Usage Example
Subs limits results to subdomains only. For example:
DNSCewl -tL targets.txt -p append.txt --level=0 --subs
Would result in:
dev.example.com
dev.help.example.com
test.example.com
test-help.example.com
test.help.example.com
No repeats example
No repeats prevents the same term being used twice in a domain.
For example, using test.example.com with an prepended list of:
test
With the following:
DNSCewl -tL targets.txt -p append.txt --no-repeats
Would result in:
test.example.com
test.testexample.com
Note that test.test.example.com isn't included, as it's a repeated subdomain. It's important to note that test.testexample.com is still possible here, as --no-repeats shouldn't prevent a subdomain and a top level domain from repeating.
Set List (-sL) Example
A set list is a series of words to perform a replacement on when one word in a set is discovered.
For example, an input of:
one.example.com
b.example.com
When provided a set list of:
one
two
three
Would output:
two.example.com
three.example.com
Include originals (-i)
If set than the original domains, from source lists are included in outputted results. If not then they will be excluded.
Range Example
By default if level=2 is set then any integers in a domain would be incremented and decremented by 100. For example,
101.example.com
Would generate domains from 1.example.com to 200.example.com as output.
Range allows you to override this setting. By default range will adjust to be both negative and positive. For example:
--range=10
Would generate domians from 91.example.com to 111.example.com. You can however specify + or - on range. So for example,
--range=+10
Would only generate domains from 101.example.com to 111.example.com as our output.
Domain Extensions (-eX)
Takes a list of domain extensions and replaces extensions on final results with them.
For example,
example.com
sub.example.com
When combined with a list of extentions that includes:
.com.au
.co.uk
Would result in a list of domains:
example.com.au
example.co.uk
sub.example.com.au
sub.example.co.uk