🔍 PTR Record Lookup

PTR Record Lookup

Reverse DNS lookups reveal the hostname bound to an IP address. They are essential for email deliverability, network reputation checks, and troubleshooting mismatched infrastructure. Use the steps below to confirm PTR records resolve as expected.

1. Enter an IPv4 or IPv6 address. We automatically transform it into the correct in-addr.arpa orip6.arpa format for the query.
2. Review the returned hostname and verify it maps back to the same IP with an A or AAAA lookup.
3. Repeat for every outbound IP your application uses so logs and email headers stay trustworthy.

Reverse DNS best practices

• Match forward and reverse records — the hostname in the PTR should resolve back to the originating IP address to avoid anti-spam penalties.
• Use branded hostnames so receiving systems can quickly identify your organization in connection logs.
• Coordinate with your ISP or cloud provider if you do not control the reverse zone directly. Many will set PTR entries for you after verifying ownership.

Troubleshooting missing PTR records

If no PTR record is returned, check that the address lives on a block delegated to you. Some providers maintain PTR DNS on separate nameservers or require requests through their control panel. Also ensure IPv6 addresses are fully expanded — shorthand notation can lead to mismatched reverse lookups if typed incorrectly.