Area Code +31-50-(3660000...3669999) located in Groningen, Groningen (GR), more detail is as below. Place International Dialing Code : 31 International Prefix : 00 National Prefix : 0 National Destination Code : 50 Subscriber Number From : 3660000 Subscriber Number To : 3669999 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 : GR Region Name : Groningen City : Groningen Timezone : Europe/Amsterdam Coordinated Universal Time : +01:00 Daylight Saving Time : Yes National Significant Number Minimum Length : 9 Latitude : 53.2100 Longitude : 6.5700 ‹ previous : +31-50-(3650000...3659999) next › : +31-50-(3670000...3679999) Dialling Instructions For trunk calls: 0 50 3660000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 00 31 50 3660000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 3660000 ~ 3669999 (Count: 10,000) Example: +31-50-3660000 / 0031-50-3660000 (050-3660000 / 0-50-3660000) +31-50-3660001 / 0031-50-3660001 (050-3660001 / 0-50-3660001) +31-50-3660002 / 0031-50-3660002 (050-3660002 / 0-50-3660002) +31-50-3660003 / 0031-50-3660003 (050-3660003 / 0-50-3660003) +31-50-3660004 / 0031-50-3660004 (050-3660004 / 0-50-3660004) ...+31-50-xxxxxxx / 0031-50-xxxxxxx (050-xxxxxxx / 0-50-xxxxxxx) ...+31-50-3669995 / 0031-50-3669995 (050-3669995 / 0-50-3669995) +31-50-3669996 / 0031-50-3669996 (050-3669996 / 0-50-3669996) +31-50-3669997 / 0031-50-3669997 (050-3669997 / 0-50-3669997) +31-50-3669998 / 0031-50-3669998 (050-3669998 / 0-50-3669998) +31-50-3669999 / 0031-50-3669999 (050-3669999 / 0-50-3669999)