hakluke/hakrevdnsSmall, fast tool for performing reverse DNS lookups en masse.
Small, fast, simple tool for performing reverse DNS lookups en masse.
You feed it IP addresses, it returns hostnames.
This can be a useful way of finding domains and subdomains belonging to a company from their IP addresses.
go install github.com/hakluke/hakrevdns@latest
The most basic usage is to simply pipe a list of IP addresses into the tool, for example:
hakluke~$ prips 173.0.84.0/24 | hakrevdns
173.0.84.110 he.paypal.com.
173.0.84.109 twofasapi.paypal.com.
173.0.84.114 www-carrier.paypal.com.
173.0.84.77 twofasapi.paypal.com.
173.0.84.102 pointofsale.paypal.com.
173.0.84.104 slc-a-origin-pointofsale.paypal.com.
173.0.84.111 smsapi.paypal.com.
173.0.84.203 m.paypal.com.
173.0.84.105 prm.paypal.com.
173.0.84.113 mpltapi.paypal.com.
173.0.84.8 ipnpb.paypal.com.
173.0.84.2 active-www.paypal.com.
173.0.84.4 securepayments.paypal.com.
...
hakluke~$ hakrevdns -h
Usage:
main [OPTIONS]
Application Options:
-t, --threads= How many threads should be used (default: 8)
-r, --resolver= IP of the DNS resolver to use for lookups
-R, --resolvers-file= File containing list of DNS resolvers to use for lookups
-U, --use-default Use default resolvers for lookups
-P, --protocol=[tcp|udp] Protocol to use for lookups (default: udp)
-p, --port= Port to bother the specified DNS resolver on (default: 53)
-d, --domain Output only domains
-h, --help Show help message
Help Options:
-h, --help Show this help message
-U, --use-default:
When specified, this flag tells the program to use a predefined list of default DNS resolvers for lookups. This is useful for ensuring consistent DNS resolution across various environments, especially if no custom resolvers are provided.
-R, --resolvers-file:
This flag allows you to specify a file containing a list of custom DNS resolvers. Each line in the file should contain a single resolver IP address. If both -R and -r are provided, the resolver specified by -r is added to the list of resolvers from the file.
If you want to use a resolver not specified by your OS, say: 1.1.1.1, try this:
hakluke~$ echo "173.0.84.110" | hakrevdns -r 1.1.1.1
173.0.84.110 he.paypal.com.
If you wish to obtain only a list of domains without IP addresses, you can use -d:
$ echo "173.0.84.110" | hakrevdns -d
This tool is designed to be easily piped into other tools, for example:
$ echo "173.0.84.110" | hakrevdns -d | httprobe
Built by hakluke (Luke Stephens), founder and CEO of Haksec, a group of cybersecurity companies:
I write about hacking and the security industry at hakluke.com.