Area Code +31-50-(3010000...3019999) 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 : 3010000 Subscriber Number To : 3019999 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-(3000000...3009999) next › : +31-50-(3020000...3029999) Dialling Instructions For trunk calls: 0 50 3010000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 00 31 50 3010000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 3010000 ~ 3019999 (Count: 10,000) Example: +31-50-3010000 / 0031-50-3010000 (050-3010000 / 0-50-3010000) +31-50-3010001 / 0031-50-3010001 (050-3010001 / 0-50-3010001) +31-50-3010002 / 0031-50-3010002 (050-3010002 / 0-50-3010002) +31-50-3010003 / 0031-50-3010003 (050-3010003 / 0-50-3010003) +31-50-3010004 / 0031-50-3010004 (050-3010004 / 0-50-3010004) ...+31-50-xxxxxxx / 0031-50-xxxxxxx (050-xxxxxxx / 0-50-xxxxxxx) ...+31-50-3019995 / 0031-50-3019995 (050-3019995 / 0-50-3019995) +31-50-3019996 / 0031-50-3019996 (050-3019996 / 0-50-3019996) +31-50-3019997 / 0031-50-3019997 (050-3019997 / 0-50-3019997) +31-50-3019998 / 0031-50-3019998 (050-3019998 / 0-50-3019998) +31-50-3019999 / 0031-50-3019999 (050-3019999 / 0-50-3019999)