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arin will only audit when you request IP space. They want to know if your A moving to your own IP space or b currently utilized what you have been assigned.
beware hosting companies that don't own their IP space will give out what they are alloted, and then they will request more from their upstream and they will ask for justification. And of course get denied. I wouldn't lie to an upstream they will catch you.
You pretty much can't use the old "dns server" for justification you can use the same IP for a dns server for multiple hosts.. a few reasons why you absolutely need your own IP space per domain/host.
SSL, (most common)
Any load balancing device that requires one ip per hsotname(old F5 BigIPs needed this not sure on the newer ones)
Mailserver/dns server that needs a Reverse record, more so applies to just a base mailserver due to rdns.
base host machines
those are the bigger/more valid reasons for IP justification.
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