What is a PTR (Pointer) record?
A PTR record (Pointer record) provides reverse DNS lookup:
- Structure: IP address (in reverse format) → hostname
- 1.2.0.192.in-addr.arpa PTR mail.tidalmail.com
Who controls PTR records: The IP address owner (usually your hosting provider or ISP) manages PTR records, not your domain registrar.
Setting up: Contact your IP provider to create or modify PTR records for your sending IPs.
Email requirements:
- PTR should exist for every sending IP
- Hostname should be meaningful (not generic)
- Forward lookup of that hostname should return the same IP (FCrDNS)
The reverse registry lookup. Given a hull number, return the ship's registered name.
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