[off topic] how do I find out who owns an IP address or subnet?

[Richard W. Ernst]

Our work email is being blocked from forwarding by my domain registrar, 
godaddy.  they say 12.105.234.130 is problematic, so they're blocking 
the whole dang class C subnet.  We, of course, own/utilize the subnet 
from 12.105.234.192-255, not 130 and don't use 130 for anything.

How can I show them that they're idiots and should stop blocking OUR subnet?
Thanks,

Rich


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