Home phone number Monaco
Monaco Phone Number validator
How the phone number format works
- Format
- Monaco phone number in national or international (+377) format
- Example
- +377612345678
Things to watch for
- Accepts national or international (E.164, e.g. +377...) format
- Validated with Google's libphonenumber; confirms the number is possible/valid for this country, not that it is currently assigned or reachable
^[+]?[0-9 ()\-]{6,}$A Monaco phone number is 9 digits under the country code +377 — a mobile number starts with 6 (612 345 678). Monaco is a sovereign city-state on the French Riviera, bordered on every landward side by France, but it is not part of France’s telephone system: +377 is a fully independent country code, distinct from the +33 used just across the border.
How this validator works
Enter the 9 digits alone (612345678), the domestic form with its leading 0 (0612345678), or the full international form (+377612345678) — this tool checks the digit count and leading-digit range against Monaco’s real numbering plan using Google’s libphonenumber, entirely in your browser. Because Monaco shares no numbering with neighbouring France, a number that looks plausible for French mobile ranges can still fail here if it doesn’t match Monaco’s own assigned ranges, and vice versa.
What a pass doesn’t tell you
A pass confirms the 9 digits fall within a real Monaco numbering range — it doesn’t confirm the line is connected or the mobile SIM active. Format validity and current reachability are separate questions this tool doesn’t try to answer.
Scope: useful for catching a mistyped digit or a wrong-country assumption before a Monaco number reaches a form or SMS gateway — not a substitute for a real lookup service.
Content last reviewed 2026-08-09.
phone number FAQ
Is a Monaco number part of France's +33 numbering plan?
No — despite being an enclave entirely surrounded by French territory on its landward side, Monaco has its own country code, +377, completely separate from France's +33. It's a common mix-up given how small and embedded in France the principality is.
Is there a trunk 0 to drop when converting to +377?
Yes, for mobile numbers. Domestically a Monaco mobile is dialled as 06 12 34 56 78; that leading 0 is dropped when the +377 country code is added, leaving the 9 digits 612345678 after the prefix.
Does a valid check confirm the Monaco line is currently active?
No. It only confirms the 9 digits match a real Monaco numbering range — not that the SIM is active or the line connected, which needs a carrier-side lookup this tool doesn't perform.