Fails to discover/report IPv6 hosts

[bert128]

Describe the bug
Fails to find IPv6 hosts.

To Reproduce
Steps to reproduce the behavior:

1. Find or create a domain which has some IPv6-only or dual stack hosts, eg google (www.google.com = dual stack, ipv6.google.com = ipv6-only)
2. run reconftw against it in passive mode, eg: ./reconftw.sh -r -p -d google.com

Expected behavior
The IPv6 addresses of dual stack hosts should be identified, IPv6-only hosts should be identified.
Manually resolving the above hosts using the "host" command is successful and returns IPv6 addresses.

Desktop (please complete the following information):

• Architecture: x64
• OS: Ubuntu
• Version 22.04

Additional context
45% of end users actively use IPv6 (source google stats)
50% of the top 1000 websites support IPv6 (source https://whynoipv6.com)
86% of the top 1000 sites have DNS servers supporting IPv6, so at least some of their infra is v6 capable and should be found by recon tools. (source https://whynoipv6.com)

[kheuser]

Could I take a crack at this one?