Area Code +81-503-(4180000...4189999) 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 : 4180000 Subscriber Number To : 4189999 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-(4170000...4179999) next › : +81-503-(4190000...4199999) Dialling Instructions For trunk calls: 0 503 4180000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 010 81 503 4180000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 4180000 ~ 4189999 (Count: 10,000) Example: +81-503-4180000 / 01081-503-4180000 (0503-4180000 / 0-503-4180000) +81-503-4180001 / 01081-503-4180001 (0503-4180001 / 0-503-4180001) +81-503-4180002 / 01081-503-4180002 (0503-4180002 / 0-503-4180002) +81-503-4180003 / 01081-503-4180003 (0503-4180003 / 0-503-4180003) +81-503-4180004 / 01081-503-4180004 (0503-4180004 / 0-503-4180004) ...+81-503-xxxxxxx / 01081-503-xxxxxxx (0503-xxxxxxx / 0-503-xxxxxxx) ...+81-503-4189995 / 01081-503-4189995 (0503-4189995 / 0-503-4189995) +81-503-4189996 / 01081-503-4189996 (0503-4189996 / 0-503-4189996) +81-503-4189997 / 01081-503-4189997 (0503-4189997 / 0-503-4189997) +81-503-4189998 / 01081-503-4189998 (0503-4189998 / 0-503-4189998) +81-503-4189999 / 01081-503-4189999 (0503-4189999 / 0-503-4189999)