523 is a non-geographic service code. It is not tied to any place. In service since November 2018.
Not geographic
Area code 523 · Works across the North American Numbering Plan
Send any number and the line type comes back with validity and clean formats. A toll-free or service number is called out by type.
curl -s "https://api.parseapi.com/phone/5235550100" \ -H "X-Api-Key: $PARSEAPI_KEY"