Slovakia phone number format
How do you format a Slovakia phone number?
Write a Slovakia phone number with the country code +421. A mobile looks like 0912 123 456 inside Slovakia and +421 912 123 456 from abroad, dropping the leading 0. Mobiles have 9 digits after the country code, and the E.164 form is +421912123456. Format alone never shows a line is in service.
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Paste your Slovakia numbers (a mixed list is fine). They are counted here at once; the free checker then gives every number its E.164 form, country and line type, with a file to download.
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See the phone add-onSlovakia number format at a glance
| Country calling code | +421 |
|---|---|
| International prefix (calling out of Slovakia) | 00 |
| Trunk prefix (domestic dialling) | 0 |
| Mobile number length | 9 digits after +421 |
| Landline number length | 6, 7 or 9 digits after +421 |
| Mobile vs landline from the digits | Yes, separate ranges |
In short: +421, 9 digits for a mobile, drop the leading 0 after +421. The checker below formats any Slovakia number free in your browser; it can't say whether a line is live. Bulk phone number validator · Pro + Phone plan
Example Slovakia phone numbers
These are the example numbers from Google’s libphonenumber data, the same numbering-plan data our validator uses, written three ways.
| Format | Mobile | Landline |
|---|---|---|
| National (inside Slovakia) | 0912 123 456 | 02 212 345 67 |
| International | +421 912 123 456 | +421 2 212 345 67 |
| E.164 | +421912123456 | +421221234567 |
How to write a Slovakia number in E.164
- Remove spaces, dashes, dots and brackets so only digits are left.
- If the number starts with the trunk prefix 0, remove it. It is only used when dialling inside Slovakia.
- Put +421 in front. The result has 9 digits after the country code for a mobile.
So 0912 123 456 becomes +421912123456. E.164 is the format SMS gateways, dialers and most CRMs store; see the E.164 format explained for why.
Mobile or landline?
Slovakia allocates separate number ranges to mobiles and landlines, so a numbering-plan check reads the line type straight from the digits, for free. That type describes the range the number came from. It doesn’t prove the number is connected today.
Mobile, landline and special number ranges in Slovakia
A Slovakia mobile number starts with 901–908, 9091–9099, 910–912, 914–919, 940, 943–945, 947–949, 95 after +421. Every valid number of each type below starts with one of the digit groups shown. A number that starts the right way can still be unassigned: the groups say what a range is for, not that a number is connected.
| Type | Starts with, after +421 | Dialled inside Slovakia | Digits | Example |
|---|---|---|---|---|
| Mobile | 901–908, 9091–9099, 910–912, 914–919, 940, 943–945, 947–949, 95 | 0901–0908, 09091–09099, 0910–0912, 0914–0919, 0940, 0943–0945, 0947–0949, 095 | 9 | +421 912 123 456 |
| Landline (fixed line) | 216, 217, 22–29, 31–38, 41–48, 51–58, 6011–6015, 819 | 0216, 0217, 022–029, 031–038, 041–048, 051–058, 06011–06015, 0819 | 6, 7 or 9 | +421 2 212 345 67 |
| Toll-free | 800 | 0800 | 9 | +421 800 123 456Not diallable from abroad |
| Premium rate | 900, 97, 98 | 0900, 097, 098 | 9 | +421 900 123 456Not diallable from abroad |
| Shared cost | 85–89 | 085–089 | 9 | +421 850 123 456Not diallable from abroad |
| Universal access (UAN) | 96 | 096 | 9 | +421 961 234 567 |
| VoIP | 602, 650–654, 690–696 | 0602, 0650–0654, 0690–0696 | 9 | +421 690 123 456 |
| Pager | 9090 | 09090 | 7 | +421 9090123Not diallable from abroad |
More on Slovakia’s free-to-call and charged ranges: toll-free and premium numbers in Slovakia.
Sources, checked 5 November 2026
- Ranges, lengths and examples: Google libphonenumber numbering-plan data (libphonenumber-js 1.13.15), the data our validator uses.
- Official plan: ITU-T E.164 national numbering plan for Slovakia. The regulator’s filing is the authority when the two disagree.
Validate a list of Slovakia numbers
Check a single number with the free phone number validator. For a whole file, upload the CSV to the verifier: every row gets a status, the E.164 number, the country and the line type, and emails in the same file get a live mailbox check. The Pro + Phone plan ($49.99 a month) adds 5,000 live carrier lookups a month for the real line type and current carrier.
Common questions
- What is the country code for Slovakia?
- The country calling code for Slovakia is +421. When you call Slovakia from abroad, dial your international prefix (or +) followed by 421 and the number without its leading 0.
- How many digits is a Slovakia phone number?
- A Slovakia mobile number has 9 digits after the country code +421, and a landline has 6, 7 or 9. Written for dialling inside Slovakia, a number gains the trunk prefix 0 in front.
- How do I write a Slovakia number in international format?
- Start with +421, drop the leading 0, then add the rest of the number. The mobile number 0912 123 456 becomes +421 912 123 456, or +421912123456 in E.164, the form most CRMs and SMS tools expect.
- Can you tell if a Slovakia number is a mobile?
- Usually, yes. Slovakia numbers come from ranges allocated separately to mobiles and landlines, so a numbering-plan check reads the line type from the digits. It tells you what the range is for, not whether the number is in service.
- Does a valid format mean a Slovakia number is in service?
- No. A valid format means the digits fit a range Slovakia's numbering plan allocates. It cannot tell whether the number is connected today or who carries it, because numbers are reassigned and ported. A live carrier lookup reports the current carrier and line type, but even that does not prove someone answers.
- Can I check a list of Slovakia numbers for free?
- Yes. Paste them in the list tab above or upload a CSV to the bulk phone number validator: E.164, country, format status and numbering-plan line type are free for every row, with no account. Live carrier and line-type lookups come with Pro + Phone at $49.99/mo (5,000 a month).
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