Area Code +81-257-(280000...289999) located in Kashiwazaki, Niigata (15), more detail is as below. Place International Dialing Code : 81 International Prefix : 010 National Prefix : 0 National Destination Code : 257 Subscriber Number From : 280000 Subscriber Number To : 289999 National Destination Code Length : 3 Uses National Destination Code : Yes National Significant Number Length : 9 Number Type : G (Geographic Land Line, Fixed Line) Carrier Name : NTT East Click here to buy Japan Area Code Database Other Information Language Code : ja (Japanese) Country Number : 392 (Japan) Country Code : JP (Japan) Region Code : 15 Region Name : Niigata City : Kashiwazaki Timezone : Asia/Tokyo Coordinated Universal Time : +09:00 Daylight Saving Time : No National Significant Number Minimum Length : 9 Latitude : 37.3700 Longitude : 138.5600 ‹ previous : +81-257-(270000...279999) next › : +81-257-(290000...299999) Dialling Instructions For trunk calls: 0 257 280000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 010 81 257 280000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 280000 ~ 289999 (Count: 10,000) Example: +81-257-280000 / 01081-257-280000 (0257-280000 / 0-257-280000) +81-257-280001 / 01081-257-280001 (0257-280001 / 0-257-280001) +81-257-280002 / 01081-257-280002 (0257-280002 / 0-257-280002) +81-257-280003 / 01081-257-280003 (0257-280003 / 0-257-280003) +81-257-280004 / 01081-257-280004 (0257-280004 / 0-257-280004) ...+81-257-xxxxxx / 01081-257-xxxxxx (0257-xxxxxx / 0-257-xxxxxx) ...+81-257-289995 / 01081-257-289995 (0257-289995 / 0-257-289995) +81-257-289996 / 01081-257-289996 (0257-289996 / 0-257-289996) +81-257-289997 / 01081-257-289997 (0257-289997 / 0-257-289997) +81-257-289998 / 01081-257-289998 (0257-289998 / 0-257-289998) +81-257-289999 / 01081-257-289999 (0257-289999 / 0-257-289999)