Austria phone number validator
How the phone number format works
- Format
- Austria phone number in national or international (+43) format
- Example
- +43664123456
Things to watch for
- Accepts national or international (E.164, e.g. +43...) 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,}$An Austrian phone number is trickier to validate by eye than most, because Austria doesn’t enforce a single fixed length for subscriber numbers the way, say, Australia or Belgium does — a Vienna landline behind the short area code “1” can run longer than a landline in a region with a longer area code. Mobile numbers are more consistent, typically starting 06 (0650–0699) followed by a variable-length subscriber block.
How this validator works
Paste the number either in local form (0664 123456) or full international form (+43664123456); this tool checks both against Austria’s real numbering-plan rules via Google’s libphonenumber library, running entirely in your browser. Because Austrian subscriber numbers vary in length by region, a simple fixed-digit-count regex would wrongly reject valid Viennese landlines or wrongly accept malformed regional ones — libphonenumber’s per-area-code rules handle that variability correctly. As with most European numbering plans, the leading 0 is a trunk prefix dropped when the +43 country code is added.
What a pass doesn’t tell you
A pass means the number’s shape — area code plus subscriber number — matches a real Austrian pattern; it says nothing about whether the number is currently connected, ported, or the same person’s number it was a year ago.
Scope: this catches format mistakes — wrong area code, malformed mobile prefix, a stray digit from a copy-paste — before the number reaches a form or a dialer. It is not a line-status or ownership check.
Content last reviewed 2026-07-07.
phone number FAQ
Why do two valid Austrian numbers sometimes have a different number of digits?
Austria's numbering plan doesn't fix subscriber number length the way many countries do. Vienna's short area code (1) leaves room for longer local numbers, while longer regional area codes pair with shorter local numbers — so two correctly formed Austrian numbers can legitimately differ in total digit count.
Does a valid result mean the Austrian number is reachable?
No. It confirms the area code and subscriber number combination fits a real Austrian pattern, not that the line is connected or still assigned to anyone. Reachability can only be confirmed by placing a call or checking with the carrier.
What's the difference between the 0 in 0664... and the +43 in +43664...?
The 0 is Austria's national trunk prefix, used only for calls placed from inside Austria. It's dropped when you switch to the +43 international format, so 0664 123456 domestically becomes +43664123456 internationally — never +430664123456.