Free API

This is the first version of an API to allow simple JSON queries Currently, its usage is limited to 500 requests per hour to prevent servers overload.

Terms and conditions


The API is free, but rate limited. Limiting does not take into account client's IP address, usernames, it's implemented for whole service.


CC BY 4.0 license (Creative Commons Attributions License). You should give credit to when using data or web services with a link or another reference to

No warranty

The data is provided "as is" without warranty or any representation of accuracy, timeliness or completeness.

Service Level Agreement

Service Level Agreement will be available for premium API services.


Get list of known PTR records for IP /24 network
Get list of known PTR records by domain