Email deliverability tool

Reverse DNS Checker

Find PTR records for a public IP and check whether a returned hostname resolves back to it.

Look up IPv4 or IPv6 PTR records
Check forward confirmation
Identify incomplete DNS observations

Check reverse DNS

Available

Ready to inspect public-IP reverse DNS and forward confirmation.

What this check does

Deliverlens queries the IP’s reverse DNS name and checks up to five returned hostnames using the corresponding address-record type.

How to read your result

A forward-confirmed result connects the IP to a published hostname. SMTP greeting, server ownership and acceptance by receiving systems require separate evidence.

What to do next

Ask the IP owner to review the PTR and corresponding A or AAAA records when forward confirmation fails.

Common questions

Who manages PTR records?

Usually the organization that allocates the IP address, such as your hosting or sending provider.

Does IPv6 work?

The checker supports public IPv6 reverse names and uses AAAA records for forward confirmation.

Technical references

DNS reverse mapping ↗

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