This free Austrian phone number checker shows whether a number is valid.
An Austrian phone number checker tells you whether a number is real, which means it follows Austria's numbering rules and is assigned. Enter a +43 number above and 1Lookup's free checker returns valid or invalid in seconds, with the line type and country, checked against Austria's numbering plan.
Pick the country, then enter the number without the country code.
Free & rate-limited. No signup required to try.
- Country code
- +43
- Mobile numbers
- 7 to 13 digits after +43
- Landlines
- 4 to 13 digits after +43, such as +43Â 1Â XXXXXX
- Written at home
- 0664 123456
- Written for apps and SMS
- +43664123456
- Dialed from the US
- 011 43 664 123456
An Austrian mobile number is +43 followed by 7 to 13 digits, and a landline has 4 to 13 digits.
Written with the country code
- +43Country code
- 6First digit
- 64 1234568 more digits
Written at home
- 0Replaces +43
- 6First digit
- 64 1234568 more digits
The +43 and the 0 do the same job, so a number is never written with both.
An Austrian phone number checker reads a number's format first and then checks it against Austria's numbering plan.
This is the path one check takes. A number can be written correctly and still not be assigned to anyone, so the format check alone is not the answer.
- You enter the numberType it the way it is written at home, such as 0664 123456, or paste it with +43.
- Its format is checkedEach type of number has its own rules. A mobile needs 7 to 13 digits after +43 and a landline needs 4 to 13 digits.
- It is checked against the numbering planNumbers outside the US and Canada are checked against the numbering plan of their country, which for this page is Austria's.Nothing is sent to the number, so it never rings and its owner is never told.
- You see valid or invalidWith the line type and country in a few seconds, and the carrier or network where one is listed.
An Austrian mobile number has 7 to 13 digits after +43 and a landline has 4 to 13 digits, and neither the length nor the first digit alone always shows which one it is.
These lengths come from the numbering data for Austria. Austrian area codes run from one to four digits, so the length of a landline depends on its area code. Mobile and landline numbers can start with the same digit, so the first digit alone does not give the type, and the line type in the result does.
| Number type | Digits after +43 | Written at home |
|---|---|---|
| Mobile | 7 to 13 | 0664 123456 |
| Landline | 4 to 13 | 01 XXXXXX |
Three common mistakes make an Austrian number fail the check, and each one is quick to fix.
Keeping the 0 after +43 adds a digit.
The 0 is only for dialing inside Austria, so +43 0664 123456 is wrong. Drop the 0 and write +43 664 123456.
Typing too few or too many digits makes a number invalid.
A mobile number has 7 to 13 digits after +43 and a landline has 4 to 13 digits. With fewer than 4 or more than 13 a number cannot be valid, so look for a missing or doubled digit.
Leaving the wrong country selected changes how the number is read.
The checker reads a number by the rules of the country selected above, so keep Austria selected for a +43 number. Paste a number with its + and country code and the country is read from the number itself.
These are the questions people ask most about checking Austrian phone numbers.
How do I check if an Austrian phone number is valid?
Enter the number in the box above with Austria selected. The free checker returns valid or invalid in seconds, with the line type and country. Type it the way it is written at home, such as 0664 123456, or in full as +43 664 123456.
How many digits is an Austrian phone number?
A mobile number has 7 to 13 digits after +43. A landline has 4 to 13 digits after +43, such as +43 1 XXXXXX.
Can I tell an Austrian mobile number from a landline by its digits?
Not by the first digit alone, because mobile and landline numbers can start with the same digit. A mobile has 7 to 13 digits after +43 and a landline has 4 to 13 digits, so some lengths fit both. Austrian area codes run from one to four digits, so the length of a landline depends on its area code. The line type in the result gives the type.
How do I write an Austrian number for an app or an SMS tool?
Use the E.164 form: a plus sign, 43, then the number without its leading 0 and no spaces, such as +43664123456.
Does the Austrian phone number checker show the carrier?
It shows the carrier or network where one is listed. Numbers outside the US and Canada are checked against the numbering plan of their country rather than live carrier data, so some come back with no carrier name.
Does valid mean the Austrian number is active?
No. Valid means the number is real, correctly written for Austria and assigned. Whether a line is switched on and reachable right now is a different question, and the free HLR lookup answers it.
Can I check a whole list of Austrian phone numbers?
Yes. This free tool checks one number at a time. A 7-day free trial opens CSV upload and the API, at 1 credit a number.
Does the person know I checked their number?
No. The check reads records only. No call or text goes to the number, so its owner is never told.
What are the landline area codes of Vienna, Graz and Linz?
At home the codes are 01 for Vienna, 0316 for Graz and 0732 for Linz. From abroad the 0 is dropped, so Vienna is +43 1. The area code is part of a landline's digits, and a mobile number has none.
You can check numbers from other countries on their own pages.
- +61Australian phone number checker
- +1Canadian phone number checker
- +44UK phone number checker
- +353Irish phone number checker
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- +65Singapore phone number checker
- +234Nigerian phone number checker
- +64New Zealand phone number checker
- +60Malaysian phone number checker
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- +63Philippine phone number checker
- +27South African phone number checker
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- +971UAE phone number checker
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- +506Costa Rican phone number checker
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These free tools answer the next question about a number.
- The +43 country code pageHow to dial Austria, the time there now and the landline places.
- HLR lookupCheck whether a mobile number is switched on and reachable right now.
- Line type lookupSee whether a number is a mobile, a landline or VoIP.
- Carrier lookupFind the carrier or network behind a number.
- Phone validator for any countryThe same check with the country picker open to every country.
- Phone validation APIRun the same check from your own software, one request per number.
Sources: Google's libphonenumber numbering data for lengths, mobile starts and landline starts, as of September 24, 2026; the ITU list of country codes.