Fixed-number family historically associated with Île-de-France. This guide separates the geographic code or numbering range from country calling code +33 and explains domestic and international formats.
Since 1 January 2023, 01 does not prove a current Île-de-France location.
Since 1 January 2023, this fixed prefix can be assigned or retained anywhere in Metropolitan France. The schematic shows its traditional association, not a verified caller location.
Fixed-number family historically associated with Île-de-France
Area code 01 is a fixed-number family historically associated with Île-de-France; it can now be assigned or retained anywhere in Metropolitan France in France.
It should be interpreted as a numbering-plan association, not a live geolocation result.
Central European Time (UTC+1) and Central European Summer Time (UTC+2)
Europe/Paris: Calculated in your browser
Where a code spans several zones, confirm the destination city before calling.
Metropolitan France’s ten-digit national numbering plan became operational on 18 October 1996. It organised fixed numbers into five broad prefix families: 01 for Île-de-France, 02 for the north-west, 03 for the north-east, 04 for the south-east and 05 for the south-west. Arcep later relaxed these geographic rules in stages, ending location-based assignment restrictions for 01–05 numbers on 1 January 2023.
Since 1 January 2023, 01 does not prove a current Île-de-France location.
“Nearby” means related entries in this country directory, not a guarantee of a shared physical border.
Fixed-number family historically associated with north-western Metropolitan France
FranceFixed-number family historically associated with north-eastern Metropolitan France
FranceFixed-number family historically associated with south-eastern Metropolitan France and Corsica
FranceFixed-number family historically associated with south-western Metropolitan France
FranceHistorically associated with Paris; not a reliable current-location indicator
FranceHistorically associated with Marseille and part of Bouches-du-Rhône
Administrative units and telephone zones are different entity types; the list reflects featured city associations only.
The directory includes verified or clearly qualified city associations and does not claim exhaustive coverage.
Current operator and market-share data are dynamic. This page avoids assigning a specific number to a carrier from its area code alone.
Area code 01 is presented as a geographic fixed-line identifier. Consult Autorité de régulation des communications électroniques, des postes et de la distribution de la presse (Arcep) for current allocation or licensing information.
Wireless numbers commonly use separate ranges. Number portability prevents reliable current-carrier identification from a prefix alone.
Domestic code: 01
International prefix: +33 1
A number beginning +33 1 matches this numbering pattern. Keep the remaining subscriber digits intact. This directory does not perform reverse lookup or identify a private subscriber.
01 is a fixed-number family historically associated with Île-de-France; it can now be assigned or retained anywhere in Metropolitan France in France.
Use +33 1 followed by the subscriber number; remove the domestic trunk prefix where applicable.
No. It describes a numbering-plan association, while portability, forwarding and internet calling can separate a number from the caller’s current location.