Area Code +31-15-(3100000...3109999) located in Delft, Zuid-Holland (ZH), more detail is as below. Place International Dialing Code : 31 International Prefix : 00 National Prefix : 0 National Destination Code : 15 Subscriber Number From : 3100000 Subscriber Number To : 3109999 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 : Delft Timezone : Europe/Amsterdam Coordinated Universal Time : +01:00 Daylight Saving Time : Yes National Significant Number Minimum Length : 9 Latitude : 52.0100 Longitude : 4.3600 ‹ previous : +31-15-(3060000...3060999) next › : +31-15-(3333000...3333999) Dialling Instructions For trunk calls: 0 15 3100000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 00 31 15 3100000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 3100000 ~ 3109999 (Count: 10,000) Example: +31-15-3100000 / 0031-15-3100000 (015-3100000 / 0-15-3100000) +31-15-3100001 / 0031-15-3100001 (015-3100001 / 0-15-3100001) +31-15-3100002 / 0031-15-3100002 (015-3100002 / 0-15-3100002) +31-15-3100003 / 0031-15-3100003 (015-3100003 / 0-15-3100003) +31-15-3100004 / 0031-15-3100004 (015-3100004 / 0-15-3100004) ...+31-15-xxxxxxx / 0031-15-xxxxxxx (015-xxxxxxx / 0-15-xxxxxxx) ...+31-15-3109995 / 0031-15-3109995 (015-3109995 / 0-15-3109995) +31-15-3109996 / 0031-15-3109996 (015-3109996 / 0-15-3109996) +31-15-3109997 / 0031-15-3109997 (015-3109997 / 0-15-3109997) +31-15-3109998 / 0031-15-3109998 (015-3109998 / 0-15-3109998) +31-15-3109999 / 0031-15-3109999 (015-3109999 / 0-15-3109999)