Germany phone number validator
How the phone number format works
- Format
- Germany phone number in national or international (+49) format
- Example
- +4915123456789
Things to watch for
- Accepts national or international (E.164, e.g. +49...) 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 German phone number doesn’t have one fixed length — unlike most of its neighbors, Germany’s numbering plan allows area codes from 2 to 5 digits and local numbers of varying length, so a Berlin landline and a small-town landline can differ by several digits even though both are valid. Mobile numbers are more consistent: a 015x, 016x, or 017x prefix followed by 7 to 8 digits, e.g. 0151 23456789. The one constant is the leading 0, a national trunk prefix dropped the moment +49 is added.
How this validator works
Type the number in national form (0151 23456789) or full international form (+4915123456789); the check runs Google’s libphonenumber against Germany’s real numbering-plan ranges — area code lengths, mobile prefixes, and total digit-count bounds — entirely client-side. Because Germany’s landline lengths vary so much, this validator can’t rely on a single digit-count rule the way an 8-digit-fixed country like Denmark can; it checks the specific range tied to each prefix instead.
What a pass doesn’t tell you
A pass means the digit count and prefix combination is possible under Germany’s real numbering plan — it doesn’t mean the number is currently connected. Given how many valid-length combinations exist, format validation is especially useful here for catching a genuinely malformed entry, but it can’t catch a correctly-shaped number that was simply mistyped into a different valid one.
Scope: use this to filter out impossible German numbers — wrong digit count for the prefix, a stray digit, a kept trunk 0 after +49 — before they reach a form or CRM. It won’t confirm the person on the other end picks up.
Content last reviewed 2026-07-07.
phone number FAQ
Why don't all German phone numbers have the same number of digits?
Germany's area codes range from 2 to 5 digits and local numbers vary in length too, a legacy of how the numbering plan was built out region by region — so a valid Munich landline and a valid rural landline can have different total lengths.
What happens to the leading 0 when converting a German number to +49 format?
It's dropped. The 0 in 0151 23456789 is a national trunk prefix, not part of the number itself, so the international form is +4915123456789 — no 0 after the country code.
Can a German mobile prefix like 015x also appear in a landline number?
No. Mobile numbers are reserved to the 015x, 016x, and 017x prefix ranges specifically; landline numbers use area-code prefixes tied to a geographic region instead, so the two ranges don't overlap.