Scripting URL normalization and resolution

From time to time most network and / or security engineers will need to normalize the output of a set of URLs to either IP literals or a formatted list of DNS names. This can be particularly useful for feeding intelligence feeds or creating block/allow lists. There are probably 10,000 other scripts to do this, but this one is mine. Potential use cases: Building custom pihole block / allow lists Building intelligence feeds Creating ACL lists Creating feeds for BGP filters Probably other stuff Benefits / Features