Use the Reverse PTR Tool for:
- Discover PTR records on the same subnet or provider.
- Find all PTR records for a single domain.
- Explore the PTR history of an IP address or domain name.
- Find PTR records by wildcard keyword.
Our Statistics
Premium Only
1+ billion PTR Records
Premium Only
2+ billion Historical PTR Records
Premium Only
10+ years of historical data
Premium Only
30 days refresh interval
Frequently Asked Questions
What is a PTR record?
A PTR (Pointer) record is a DNS record used for reverse DNS lookups, mapping an IP address to its associated domain name. It is commonly used for verifying the legitimacy of email sources and in network diagnostics.
Do you support PTR records for IPv6 addresses?
No, at this moment only IPv4 addresses are supported.
How often do you resolve PTR records for an IP address?
Our DNS crawlers attempt to resolve each PTR record every 30 days.
Timeline collecting RDNS / PTR data
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Start collecting RDNS / PTR data
September 2013
Start collecting RDNS data based on Open Data from Rapid7 Labs. Data is collected every quarter.
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Start storing historical RDNS Data
Januari 2014
Start storing historical RDNS records. Historical records are stored with a first and last seen date.
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Increased frequency RDNS data
May 2016
RDNS data is now refreshed every month.
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Extending RDNS data
October 2018
RDNS data now includes additional data like ASN, provider and GEO data.
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Start using our own DNS crawler
June 2021
Stop using the Open Data from Rapid7 Labs and integrate our own DNS crawler. No changes in the frequency and data collected.