Attacking DNS - ATTACKING COMMON SERVICES

Im stuck for almost a week here.
I tried to enumerate dns by bruteforce and found 2 domains.

I tried to zone transfer to ns, but it failed.

I tried to zone transfer to main domain, but it failed too.

fierce failed too

I tried subbrute too, but it just produces error and taking forever.
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What to do now? :frowning:

EDIT: After a few seconds of posting this. I just found it out. lllllllllllllllooooooooooooolllllllllllllllllllllllllllll