Area Code +81-501-(4370000...4379999) located in VoIP, more detail is as below. Place International Dialing Code : 81 International Prefix : 010 National Prefix : 0 National Destination Code : 501 Subscriber Number From : 4370000 Subscriber Number To : 4379999 National Destination Code Length : 3 Uses National Destination Code : Yes National Significant Number Length : 10 Number Type : V (VoIP, Location Independent fixed land line) Carrier Name : Softbank Broadband Click here to buy Japan Area Code Database Other Information Language Code : ja (Japanese) Country Number : 392 (Japan) Country Code : JP (Japan) City : VoIP Timezone : Asia/Tokyo Coordinated Universal Time : +09:00 Daylight Saving Time : No National Significant Number Minimum Length : 10 Latitude : None Longitude : None ‹ previous : +81-501-(4360000...4369999) next › : +81-501-(4380000...4389999) Dialling Instructions For trunk calls: 0 501 4370000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 010 81 501 4370000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 4370000 ~ 4379999 (Count: 10,000) Example: +81-501-4370000 / 01081-501-4370000 (0501-4370000 / 0-501-4370000) +81-501-4370001 / 01081-501-4370001 (0501-4370001 / 0-501-4370001) +81-501-4370002 / 01081-501-4370002 (0501-4370002 / 0-501-4370002) +81-501-4370003 / 01081-501-4370003 (0501-4370003 / 0-501-4370003) +81-501-4370004 / 01081-501-4370004 (0501-4370004 / 0-501-4370004) ...+81-501-xxxxxxx / 01081-501-xxxxxxx (0501-xxxxxxx / 0-501-xxxxxxx) ...+81-501-4379995 / 01081-501-4379995 (0501-4379995 / 0-501-4379995) +81-501-4379996 / 01081-501-4379996 (0501-4379996 / 0-501-4379996) +81-501-4379997 / 01081-501-4379997 (0501-4379997 / 0-501-4379997) +81-501-4379998 / 01081-501-4379998 (0501-4379998 / 0-501-4379998) +81-501-4379999 / 01081-501-4379999 (0501-4379999 / 0-501-4379999)