randomly missing some domains from provided list about dnscan

[tahseen2k8]

i have realized that the issue is happening on increasing threads .
so as per code maximum threads are 32 i have set them 500 so if i am running on 32 the results are as per expectations but if i run same script with 500 threads the result is missing for same domain .
your quick guide/response will highly appreciated

[rbsec]

Thanks for coming back with some more details - it sounds like threads are definitely the problem.

The max thread limit of 32 is there for a reason - even on a LAN most DNS servers are going to start dropping requests if you're trying to make 500 requests at once. You might be able to go a bit above 32, but it completely depends on the server and your internet connection. I'd recommend leaving the cap where it is.