Area Code +31-223-(540000...549999) located in Den Helder, Noord-Holland (NH), more detail is as below. Place International Dialing Code : 31 International Prefix : 00 National Prefix : 0 National Destination Code : 223 Subscriber Number From : 540000 Subscriber Number To : 549999 National Destination Code Length : 3 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 : NH Region Name : Noord-Holland City : Den Helder Timezone : Europe/Amsterdam Coordinated Universal Time : +01:00 Daylight Saving Time : Yes National Significant Number Minimum Length : 9 Latitude : 52.9600 Longitude : 4.7600 ‹ previous : +31-223-(530000...539999) next › : +31-223-(610000...619999) Dialling Instructions For trunk calls: 0 223 540000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 00 31 223 540000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 540000 ~ 549999 (Count: 10,000) Example: +31-223-540000 / 0031-223-540000 (0223-540000 / 0-223-540000) +31-223-540001 / 0031-223-540001 (0223-540001 / 0-223-540001) +31-223-540002 / 0031-223-540002 (0223-540002 / 0-223-540002) +31-223-540003 / 0031-223-540003 (0223-540003 / 0-223-540003) +31-223-540004 / 0031-223-540004 (0223-540004 / 0-223-540004) ...+31-223-xxxxxx / 0031-223-xxxxxx (0223-xxxxxx / 0-223-xxxxxx) ...+31-223-549995 / 0031-223-549995 (0223-549995 / 0-223-549995) +31-223-549996 / 0031-223-549996 (0223-549996 / 0-223-549996) +31-223-549997 / 0031-223-549997 (0223-549997 / 0-223-549997) +31-223-549998 / 0031-223-549998 (0223-549998 / 0-223-549998) +31-223-549999 / 0031-223-549999 (0223-549999 / 0-223-549999)