Does PTR pointing to domain is forbidden? If so - which RFC states that. The same with A record pointing at the domain. As I see, usually, people are trying to avoid such configurations. But I would like to be precise here. Is it forbidden or not. Thanks.
Example: funnydomain.com. 3600 IN A 18.104.22.168
22.214.171.124.in-addr.arpa. 7200 IN PTR funnydomain.com.