Area Code +31-71-(4010000...4019999) located in Leiden, Zuid-Holland (ZH), more detail is as below. Place International Dialing Code : 31 International Prefix : 00 National Prefix : 0 National Destination Code : 71 Subscriber Number From : 4010000 Subscriber Number To : 4019999 National Destination Code Length : 2 Uses National Destination Code : Yes National Significant Number Length : 9 Number Type : G (Geographic Land Line, Fixed Line) Carrier Name : KPN B.V. Click here to buy Netherlands Area Code Database Other Information Language Code : nl (Dutch) Country Number : 528 (Netherlands) Country Code : NL (Netherlands) Region Code : ZH Region Name : Zuid-Holland City : Leiden Timezone : Europe/Amsterdam Coordinated Universal Time : +01:00 Daylight Saving Time : Yes National Significant Number Minimum Length : 9 Latitude : 52.1600 Longitude : 4.4900 ‹ previous : +31-71-(4004000...4008999) next › : +31-71-(4020000...4029999) Dialling Instructions For trunk calls: 0 71 4010000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 00 31 71 4010000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 4010000 ~ 4019999 (Count: 10,000) Example: +31-71-4010000 / 0031-71-4010000 (071-4010000 / 0-71-4010000) +31-71-4010001 / 0031-71-4010001 (071-4010001 / 0-71-4010001) +31-71-4010002 / 0031-71-4010002 (071-4010002 / 0-71-4010002) +31-71-4010003 / 0031-71-4010003 (071-4010003 / 0-71-4010003) +31-71-4010004 / 0031-71-4010004 (071-4010004 / 0-71-4010004) ...+31-71-xxxxxxx / 0031-71-xxxxxxx (071-xxxxxxx / 0-71-xxxxxxx) ...+31-71-4019995 / 0031-71-4019995 (071-4019995 / 0-71-4019995) +31-71-4019996 / 0031-71-4019996 (071-4019996 / 0-71-4019996) +31-71-4019997 / 0031-71-4019997 (071-4019997 / 0-71-4019997) +31-71-4019998 / 0031-71-4019998 (071-4019998 / 0-71-4019998) +31-71-4019999 / 0031-71-4019999 (071-4019999 / 0-71-4019999)