710 is reserved for the United States federal government. In service since January 1984.
US Government
Area code 710 · 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/7105550100" \ -H "X-Api-Key: $PARSEAPI_KEY"