DNS & Email Trust
low Severity
Free Check

Reverse DNS / PTR Record Verification

Checks whether outbound web and mail server IP addresses have matching Forward-Confirmed Reverse DNS (FCrDNS) pointers.

Test Your Website for Reverse DNS / PTR Record Verification

Run this check along with 90+ automated tests across your domain.

Why It Matters

Lack of PTR records causes email delivery to fail anti-spam filters and indicates amateur server infrastructure.

How We Check This

We perform a reverse IP lookup for PTR records and forward lookup the resulting hostname to verify match.

How to Fix & Implement

Copy-paste configuration blocks tailored for your web server or edge proxy.

nginx snippet
# Set PTR record in your cloud hosting provider console (AWS Route53, DigitalOcean, Hetzner)

Frequently Asked Questions

What is FCrDNS?

Forward-Confirmed reverse DNS means IP -> Hostname and Hostname -> IP point to each other symmetrically.