All available North American Numbering Plan Administration prefixes for 473 September 16, 2014 Tim 473-269 473-328 473-329 473-406 473-407 473-408 473-409 473-435 473-436 473-437 473-438 473-439 473-440 473-441 473-442 473-443 473-444 473-449 473-468 473-473 473-555 473-636 473-938