Not quite that many, the NANP only allows NXX numbers that would match this Regex: [2-9](?!11)[0-9]{2} So there's only 7,200,000 numbers allowable within a si

Not quite that many, the NANP only allows NXX numbers that would match this Regex: [2-9](?!11)[0-9]{2} So there's only 7,200,000 numbers allowable within a singe NANP area code.