Area Code +31-15-(7991000...7991999) 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 : 7991000 Subscriber Number To : 7991999 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 : ACM 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-(7990000...7990999) next › : +31-15-(7992000...7992999) Dialling Instructions For trunk calls: 0 15 7991000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 00 31 15 7991000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 7991000 ~ 7991999 (Count: 1,000) Example: +31-15-7991000 / 0031-15-7991000 (015-7991000 / 0-15-7991000) +31-15-7991001 / 0031-15-7991001 (015-7991001 / 0-15-7991001) +31-15-7991002 / 0031-15-7991002 (015-7991002 / 0-15-7991002) +31-15-7991003 / 0031-15-7991003 (015-7991003 / 0-15-7991003) +31-15-7991004 / 0031-15-7991004 (015-7991004 / 0-15-7991004) ...+31-15-xxxxxxx / 0031-15-xxxxxxx (015-xxxxxxx / 0-15-xxxxxxx) ...+31-15-7991995 / 0031-15-7991995 (015-7991995 / 0-15-7991995) +31-15-7991996 / 0031-15-7991996 (015-7991996 / 0-15-7991996) +31-15-7991997 / 0031-15-7991997 (015-7991997 / 0-15-7991997) +31-15-7991998 / 0031-15-7991998 (015-7991998 / 0-15-7991998) +31-15-7991999 / 0031-15-7991999 (015-7991999 / 0-15-7991999)