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File dns-client-subnet-scan

Script types: prerule, portrule
Categories: discovery, safe
Download: http://nmap.org/svn/scripts/dns-client-subnet-scan.nse

User Summary

Performs a domain lookup using the edns-client-subnet option which allows clients to specify the subnet that queries supposedly originate from. The script uses this option to supply a number of geographically distributed locations in an attempt to enumerate as many different address records as possible. The script also supports requests using a given subnet.

Script Arguments

dns-client-subnet.mask

[optional] The number of bits to use as subnet mask (default: 24)

dns-client-subnet.address

The client subnet address to use

dns-client-subnet.domain

The domain to lookup eg. www.example.org

dns-client-subnet.nameserver

[optional] nameserver to use. (default = host.ip)

Example Usage

  nmap -sU -p 53 --script dns-client-subnet-scan  --script-args \
    dns-client-subnet-scan.domain=www.example.com, \
    dns-client-subnet-scan.address=192.168.0.1 \
    [,dns-client-subnet.nameserver=8.8.8.8] \
    [,dns-client-subnet.mask=24] <target>
  nmap --script dns-client-subnet-scan --script-args \
    dns-client-subnet-scan.domain=www.example.com, \
    dns-client-subnet-scan.address=192.168.0.1 \
    dns-client-subnet.nameserver=8.8.8.8, \
    [,dns-client-subnet.mask=24]

Script Output

53/udp open  domain  udp-response
| dns-client-subnet-scan:
| www.google.com
|   1.2.3.4
|   5.6.7.8
|   9.10.11.12
|   13.14.15.16
|   .
|   .
|_  .

Requires


Author: John R. Bond

License: Simplified (2-clause) BSD license--See http://nmap.org/svn/docs/licenses/BSD-simplified

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