Area Code +81-503-(4530000...4539999) 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 : 4530000 Subscriber Number To : 4539999 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-(4520000...4529999) next › : +81-503-(4540000...4549999) Dialling Instructions For trunk calls: 0 503 4530000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 010 81 503 4530000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 4530000 ~ 4539999 (Count: 10,000) Example: +81-503-4530000 / 01081-503-4530000 (0503-4530000 / 0-503-4530000) +81-503-4530001 / 01081-503-4530001 (0503-4530001 / 0-503-4530001) +81-503-4530002 / 01081-503-4530002 (0503-4530002 / 0-503-4530002) +81-503-4530003 / 01081-503-4530003 (0503-4530003 / 0-503-4530003) +81-503-4530004 / 01081-503-4530004 (0503-4530004 / 0-503-4530004) ...+81-503-xxxxxxx / 01081-503-xxxxxxx (0503-xxxxxxx / 0-503-xxxxxxx) ...+81-503-4539995 / 01081-503-4539995 (0503-4539995 / 0-503-4539995) +81-503-4539996 / 01081-503-4539996 (0503-4539996 / 0-503-4539996) +81-503-4539997 / 01081-503-4539997 (0503-4539997 / 0-503-4539997) +81-503-4539998 / 01081-503-4539998 (0503-4539998 / 0-503-4539998) +81-503-4539999 / 01081-503-4539999 (0503-4539999 / 0-503-4539999)