Area Code +31-23-(2001000...2001999) located in Haarlem, Noord-Holland (NH), more detail is as below. Place International Dialing Code : 31 International Prefix : 00 National Prefix : 0 National Destination Code : 23 Subscriber Number From : 2001000 Subscriber Number To : 2001999 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 : NH Region Name : Noord-Holland City : Haarlem Timezone : Europe/Amsterdam Coordinated Universal Time : +01:00 Daylight Saving Time : Yes National Significant Number Minimum Length : 9 Latitude : 52.3800 Longitude : 4.6400 ‹ previous : +31-23-(2000000...2000999) next › : +31-23-(2002000...2002999) Dialling Instructions For trunk calls: 0 23 2001000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 00 31 23 2001000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 2001000 ~ 2001999 (Count: 1,000) Example: +31-23-2001000 / 0031-23-2001000 (023-2001000 / 0-23-2001000) +31-23-2001001 / 0031-23-2001001 (023-2001001 / 0-23-2001001) +31-23-2001002 / 0031-23-2001002 (023-2001002 / 0-23-2001002) +31-23-2001003 / 0031-23-2001003 (023-2001003 / 0-23-2001003) +31-23-2001004 / 0031-23-2001004 (023-2001004 / 0-23-2001004) ...+31-23-xxxxxxx / 0031-23-xxxxxxx (023-xxxxxxx / 0-23-xxxxxxx) ...+31-23-2001995 / 0031-23-2001995 (023-2001995 / 0-23-2001995) +31-23-2001996 / 0031-23-2001996 (023-2001996 / 0-23-2001996) +31-23-2001997 / 0031-23-2001997 (023-2001997 / 0-23-2001997) +31-23-2001998 / 0031-23-2001998 (023-2001998 / 0-23-2001998) +31-23-2001999 / 0031-23-2001999 (023-2001999 / 0-23-2001999)