~ dns tools

Reverse DNS Lookup

Reverse DNS checks the PTR record for an IP address. It is commonly used for mail reputation, server identification, and quick network breadcrumbs.

What It Checks

• PTR records for public IPv4 and IPv6 addresses.
• Hostname clues tied to mail servers, cloud instances, and provider infrastructure.
• Whether reverse DNS exists at all.

Common Uses

Use it when reviewing email deliverability, checking server identity, investigating logs, or confirming whether a mail server has a meaningful reverse DNS name.

Gotchas

• No PTR record does not always mean a host is broken.
• PTR records are controlled by the IP owner, not the domain owner.
• A PTR should match forward DNS for stricter mail hygiene.