DNSFilter

DNSFilter is a helper tool that is used to quickly filter out domains found by subdomain discovery tools that are either invalid, or out of scope. This tool is designed to be used in conjunction with tools like subfinder, assetfinder, etc.

Invalid domain names are printed to the stderr, while valid domain names are transformed according to IDNA2008 and printed to the stdout.

Installation

go install github.com/bountyhub-org/dnsfilter@latest

Usage

Help

dnsfilter -h

Example

subfinder -d example.com | sort -u | dnsfilter -scope .example.com -scope example.net -out-of-scope specific.target.example.com > output.txt