Area Code +81-503-(5700000...5709999) located in VoIP, more detail is as below. Place International Dialing Code : 81 International Prefix : 010 National Prefix : 0 National Destination Code : 503 Subscriber Number From : 5700000 Subscriber Number To : 5709999 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 : NTT Communications 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 : +81-503-(5690000...5699999) next › : +81-503-(5710000...5719999) Dialling Instructions For trunk calls: 0 503 5700000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 010 81 503 5700000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 5700000 ~ 5709999 (Count: 10,000) Example: +81-503-5700000 / 01081-503-5700000 (0503-5700000 / 0-503-5700000) +81-503-5700001 / 01081-503-5700001 (0503-5700001 / 0-503-5700001) +81-503-5700002 / 01081-503-5700002 (0503-5700002 / 0-503-5700002) +81-503-5700003 / 01081-503-5700003 (0503-5700003 / 0-503-5700003) +81-503-5700004 / 01081-503-5700004 (0503-5700004 / 0-503-5700004) ...+81-503-xxxxxxx / 01081-503-xxxxxxx (0503-xxxxxxx / 0-503-xxxxxxx) ...+81-503-5709995 / 01081-503-5709995 (0503-5709995 / 0-503-5709995) +81-503-5709996 / 01081-503-5709996 (0503-5709996 / 0-503-5709996) +81-503-5709997 / 01081-503-5709997 (0503-5709997 / 0-503-5709997) +81-503-5709998 / 01081-503-5709998 (0503-5709998 / 0-503-5709998) +81-503-5709999 / 01081-503-5709999 (0503-5709999 / 0-503-5709999)