Reverse IP Lookup Tool
Resolve PTR records from IPv4 and IPv6 addresses to verify reverse DNS hostnames.
Reverse IP Lookup (PTR)
Type: PTR
Reverse hostname records
Reverse DNS Capabilities
✓
IPv4 and IPv6 support
Resolve PTR records from both modern and legacy IP formats.
✓
Resolver details
See status and answer data in structured response format.
✓
Filterable output
Search PTR answers quickly in larger resolver outputs.
Where Reverse IP Lookup Is Useful
- ✓Mail server validation
Check reverse DNS consistency for sender reputation and deliverability.
- ✓Security investigations
Map suspicious IPs to hostnames during incident triage.
- ✓Infrastructure audits
Verify PTR alignment during server provisioning and transfers.
Frequently Asked Questions
What is PTR in reverse IP lookup?
PTR records map an IP address back to a hostname, often used for server identity and email trust checks.
Does reverse IP lookup always return a hostname?
No. Some IP addresses do not have PTR records configured, so lookups can return no answer.
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