Area Code +52-81-(10010000...10019999) located in Monterrey, Nuevo León (NLE), more detail is as below. Place International Dialing Code : 52 International Prefix : 00 National Prefix : 01 National Destination Code : 81 Subscriber Number From : 10010000 Subscriber Number To : 10019999 National Destination Code Length : 2 Uses National Destination Code : Yes National Significant Number Length : 10 Number Type : G (Geographic Land Line, Fixed Line) Carrier Name : ALESTRA, S. DE R.L. DE C.V. Click here to buy Mexico Area Code Database Other Information Language Code : es (Spanish) Country Number : 484 (Mexico) Country Code : MX (Mexico) Region Code : NLE Region Name : Nuevo León City : Monterrey Timezone : America/Monterrey Coordinated Universal Time : -06:00 Daylight Saving Time : Yes National Significant Number Minimum Length : 10 Latitude : 25.6700 Longitude : -100.3100 ‹ previous : +52-81-(10000000...10009999) next › : +52-81-(10020000...10029999) Dialling Instructions For trunk calls: 1 81 10010000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 00 52 81 10010000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 10010000 ~ 10019999 (Count: 10,000) Example: +52-81-10010000 / 0052-81-10010000 (0181-10010000 / 01-81-10010000) +52-81-10010001 / 0052-81-10010001 (0181-10010001 / 01-81-10010001) +52-81-10010002 / 0052-81-10010002 (0181-10010002 / 01-81-10010002) +52-81-10010003 / 0052-81-10010003 (0181-10010003 / 01-81-10010003) +52-81-10010004 / 0052-81-10010004 (0181-10010004 / 01-81-10010004) ...+52-81-xxxxxxxx / 0052-81-xxxxxxxx (0181-xxxxxxxx / 01-81-xxxxxxxx) ...+52-81-10019995 / 0052-81-10019995 (0181-10019995 / 01-81-10019995) +52-81-10019996 / 0052-81-10019996 (0181-10019996 / 01-81-10019996) +52-81-10019997 / 0052-81-10019997 (0181-10019997 / 01-81-10019997) +52-81-10019998 / 0052-81-10019998 (0181-10019998 / 01-81-10019998) +52-81-10019999 / 0052-81-10019999 (0181-10019999 / 01-81-10019999)