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Find the hostname behind an IP address and check that it points back to the same IP. Mail servers check this before they trust your email.
The hostname the IP address gives for itself.
Whether that hostname points back to the same IP. This is called forward-confirmed reverse DNS.
Servers that send email need a matching PTR record, or their mail is more likely to land in spam.
Straight answers about your results.
Normal DNS turns a name into an IP address. Reverse DNS turns an IP address back into a name, using a PTR record.
Many mail servers check that the sending IP has a PTR record that points back to the same IP. If it doesn’t, your mail may be rejected or sent to spam.
Only the company that owns the IP address, usually your host or internet provider. You can’t set it in your normal DNS records.
Yes. It’s free and there’s nothing to sign up for.
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A dedicated IP gives your site its own sending reputation, safe from bad neighbors.