Full Email Infrastructure Suite

Email Record Generators & DNS Diagnostics

Instantly generate SPF, DMARC, and DKIM key pairs (Private + Public) or perform real-time DNS & blacklist checks.

Record Generators
SPF Generator Build custom v=spf1 records
DMARC Generator Build v=DMARC1 compliance rule
DKIM Key Pair Generator Generate Private & Public RSA Keys
Live Lookup & Diagnostics
SPF Lookup Verify sender policy framework
DMARC Checker Inspect domain auth policies
DKIM Lookup Query public key records
MX Records Lookup Check mail exchange routing
IP Blacklist Checker Multi-DNSBL real-time check
Reverse DNS (PTR) Resolve IP hostnames
Email Header Analyzer Extract hop paths & auth results
Disposable Email Check Detect temp email addresses

Reverse DNS (PTR) Lookup

Check if an IP address properly resolves to its target host domain name.

About Reverse DNS (PTR) Lookup

A Pointer (PTR) record maps an IP address back to a host domain name (Reverse DNS). Most major ISPs reject inbound mail from IPs that lack a valid PTR record.

How to Use This Tool:
  • Type in your public server IP address.
  • Click "Lookup PTR".
  • Verify that the resolved hostname matches your sending domain identity.
Frequently Asked Questions

PTR records can only be configured by the owner of the IP address, which is typically your VPS provider, web host, or ISP (e.g., DigitalOcean, AWS, Linode).

Need High-Volume Email Infrastructure?

We deploy high-deliverability SMTP servers, PowerMTA setups, custom DNS authentications, and IP warmups.

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