Why does reverse DNS matter for sending email?

Many receiving mail servers check that a sending server's IP has a matching PTR record, and that the PTR hostname resolves back to the same IP (forward-confirmed reverse DNS). Missing or mismatched PTR records are a common reason legitimate mail gets flagged as spam.

Why is there no PTR record for my server's IP?

PTR records are managed by whoever owns the IP block — usually your hosting or VPS provider, not your domain registrar. If you need one set up, contact your hosting provider's support team directly.

Hostperl DNS Tools

Reverse DNS Checker

Run a reverse DNS lookup on any IPv4 or IPv6 address to find its associated PTR hostname.

Reverse DNS resolves an IP address back to a hostname, the opposite direction of a normal DNS lookup. It's commonly checked when diagnosing email deliverability or verifying server identity.

Frequently asked questions

A PTR (pointer) record maps an IP address back to a hostname — the reverse of a normal A record, which maps a hostname to an IP. It's set up by whoever controls the IP address, typically a hosting provider or ISP.