Slovakia phone number format
Slovakia phone numbers use the country code +421. A mobile number looks like 0912 123 456 inside Slovakia and +421 912 123 456 from abroad: the leading 0 is dropped after +421. Mobiles have 9 digits after the country code, and the E.164 form is +421912123456.
Slovakia 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 |
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.
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 Email + 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.
That was one number. Your CRM export has thousands.
This tool checks one number at a time. Cleaning a list means every row in E.164, invalid numbers separated out, and the emails beside them checked too.
- Upload a CSV up to 100,000 rows with an email or phone column
- Every phone gets status, E.164 format, country and line type
- Emails in the same file get a real SMTP mailbox check
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