+1 on HULK's info. I wanted to add that, It depends on the FQDN.
Don't use FQDN's for large corporations, where they either use CDN's or round robin DNS. Because the frequency is a 15 minute refresh, there's no real time DNS resolution for FQDN's. This may lead to incorrect or unexpected behaviors.
There's also another practice, that is, to give you a long list of possible IP's on a single A record. The firewall will only grab the first ten provided on that long list.
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