nsfckup

Take a list of domains and inspect their NameServer domains which return an NXDOMAIN response to dig. This could indicate a NameServer domain takeover issue, which could be pretty impactful!

Recommended Usage

$ cat domains | nsfckup -c 50 -v

or

$ assetfinder example.com | nsfckup -c 50

or

$ nsfckup example.com

Options

  -c int
        set the concurrency level (default 20)
  -s    Be strict on CNAME, must include the target domain
  -v    Get more info on attempts

Install

go install github.com/cybercdh/nsfckup@latest

Thanks

A lot of Go concepts were taken from @tomnomnom's excellent repos, particularly httprobe