FreeCNAM

We wanted to provide the community with a free and simple way to access telcom CNAM data, so we've launched this resource.

Using this free API is simple: Just make a normal (GET) request to https://freecnam.org/dip with a phone number set to the "q" query parameter

Example: https://freecnam.org/dip?q=2125551234
The response to this request is a standard 15-character CNAM result.

It is really as simple as that.
Since this is a free community service, there are common sense rate limits to prevent abuse.

If you need something more substantial, take a look at Telephony Research.