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Verify PTR records and forward-confirmed reverse DNS for any IP address. Essential for email deliverability.
Enter an IP address to look up its PTR record and verify forward-confirmed reverse DNS.
A PTR (Pointer) record maps an IP address to a hostname — the reverse of an A record. It is stored in a special DNS zone managed by whoever controls the IP address (usually your hosting provider or ISP). PTR records are essential for reverse DNS lookups, which mail servers use to verify the identity of sending servers.
Email servers routinely check PTR records to verify that the sending IP belongs to a legitimate mail server. Missing or mismatched PTR records are treated as a strong spam signal. Google and Yahoo require valid PTR records for all bulk senders as part of their 2024 email authentication requirements. Without a proper PTR record, your emails may be rejected or routed to spam.
FCrDNS is a two-step verification: first, the PTR record for an IP is looked up to find the hostname; then, an A record lookup on that hostname is performed to check if it resolves back to the original IP. When both match, it proves the IP and hostname genuinely belong together. This is considered a strong trust signal by mail servers and anti-spam systems.
PTR records are managed by your IP address provider, not your domain registrar. Contact your hosting provider or ISP and request a PTR record pointing your server's IP to a hostname you control (typically your mail server's hostname). After it's set, add a matching A record on your DNS to complete the forward-confirmed reverse DNS chain.
Unboxd reads every email and gives you a daily briefing with only what matters.