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Date: Thu, 7 Sep 2017 17:34:15 +0100
From: RW <rwmaillists@googlemail.com>
To: freebsd-questions@freebsd.org
Subject: Re: looking for batch dns inquiry tool
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On Thu, 07 Sep 2017 11:22:44 -0400
Ernie Luzar wrote:

> What I am looking for is a command or port that I can feed it a file 
> containing domain names and for each one output a file containing the 
> extended domain names I should be blocking.
> 

It's easy to script this kind of thing. I prefer dig, e.g.

$ dig +short www.thaiheart.org
vc1.readyplanet.com.
203.151.233.134

However what you want to do seems draconian because you are blocking the
hosting  company rather than the specific site.