// Tool
Reverse DNS / PTR Lookup
Look up the PTR record for any IPv4 or IPv6 address. Queries are sent over DoH to Cloudflare (1.1.1.1) and Google (8.8.8.8) for verification.
Accepts IPv4 or IPv6. The address is converted to its
.in-addr.arpa or .ip6.arpa form before query.Frequently Asked Questions
What is a PTR record?
A PTR record maps an IP address back to a hostname — the reverse of an A/AAAA record. It lives under in-addr.arpa for IPv4 or ip6.arpa for IPv6.
Why does reverse DNS matter for email?
Many mail servers reject or down-score senders whose IP lacks a PTR record or whose PTR does not match the sending hostname (forward-confirmed reverse DNS). Proper rDNS improves deliverability.
Who controls the PTR record for my IP?
The owner of the IP block — usually your ISP or hosting provider — not the domain owner. To set a custom PTR you typically request it from whoever assigned the address.
