Area Code +81-503-(1600000...1609999) 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 : 1600000 Subscriber Number To : 1609999 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 : KDDI 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-(1590000...1599999) next › : +81-503-(1610000...1619999) Dialling Instructions For trunk calls: 0 503 1600000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 010 81 503 1600000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 1600000 ~ 1609999 (Count: 10,000) Example: +81-503-1600000 / 01081-503-1600000 (0503-1600000 / 0-503-1600000) +81-503-1600001 / 01081-503-1600001 (0503-1600001 / 0-503-1600001) +81-503-1600002 / 01081-503-1600002 (0503-1600002 / 0-503-1600002) +81-503-1600003 / 01081-503-1600003 (0503-1600003 / 0-503-1600003) +81-503-1600004 / 01081-503-1600004 (0503-1600004 / 0-503-1600004) ...+81-503-xxxxxxx / 01081-503-xxxxxxx (0503-xxxxxxx / 0-503-xxxxxxx) ...+81-503-1609995 / 01081-503-1609995 (0503-1609995 / 0-503-1609995) +81-503-1609996 / 01081-503-1609996 (0503-1609996 / 0-503-1609996) +81-503-1609997 / 01081-503-1609997 (0503-1609997 / 0-503-1609997) +81-503-1609998 / 01081-503-1609998 (0503-1609998 / 0-503-1609998) +81-503-1609999 / 01081-503-1609999 (0503-1609999 / 0-503-1609999)