Slovakia Phone Carrier Lookup
Find which network a Slovakia number is on today, its line type and whether it has been ported. Free, private, no sign-up.
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Slovakia phone numbers at a glance
Slovakia numbers use the country code +421, and mobile numbers usually start with +421 90, +421 91, +421 94 or +421 95. The networks with the most number ranges are T-Mobile (Slovak Telekom), Orange, Telefonica O2 and 4ka of SWAN. Because numbers can move between networks, the lookup above checks live carrier records to show the network a number is on today. It also shows the line type, whether the number was ported and whether it is a VoIP line - free, with no sign-up.
Updated October 2026
- Country code
- +421
- Trunk prefix
- 0 inside Slovakia
- Mobile number length
- 9 digits after +421
- Mobiles start with
- +421 90, +421 91, +421 94 or +421 95
How Slovakia numbers are written
Official example numbers for each line type, written the international way and the way they are dialled inside Slovakia.
| Line type | International | Inside Slovakia |
|---|---|---|
| Mobile | +421 912 123 456 |
0912 123 456 |
| Landline | +421 2 212 345 67 |
02 212 345 67 |
| Toll-free | +421 800 123 456 |
0800 123 456 |
Networks and number ranges in Slovakia
Which network each block of Slovakia numbers was first issued to, from the official numbering data. Numbers can move between networks, so run a lookup to see where one is today.
T-Mobile (Slovak Telekom)
+421 901
+421 902
+421 903
+421 904
+421 9091
+421 9092
+11 more
Orange
+421 905
+421 906
+421 907
+421 908
+421 915
+421 916
+4 more
Telefonica O2
+421 940
+421 944
+421 947
+421 948
+421 949
4ka of SWAN
+421 950
+421 951
+421 952
Alternet, s.r.o.
+421 94312
BSG Estonia
+421 9430
IPfon, s.r.o.
+421 94333
Slovak Republic Railways (GSM-R)
+421 9598
Ranges are written in international format; inside Slovakia dial 0 in place of +421. Source: Google libphonenumber numbering data.
How to check a Slovakia number
Three steps, no sign-up - pick a country, paste the number, read the result.
-
1
Pick the country
Slovakia is already selected - or type the full number with its
+421code. -
2
Enter the number
Paste any phone number. We clean up spaces, dashes and brackets automatically.
-
3
Get the details
Instantly see the country, line type, carrier and whether it's a real mobile or a VoIP line.
Carrier lookup in other countries
Networks, number ranges and number formats for 89 countries.
United States
+1
United Kingdom
+44
Canada
+1
India
+91
Australia
+61
Germany
+49
France
+33
Spain
+34
Italy
+39
Netherlands
+31
Sweden
+46
Brazil
+55
Show all 88 countries
Afghanistan
+93
Azerbaijan
+994
Bahrain
+973
Bangladesh
+880
Barbados
+1
Belgium
+32
Bermuda
+1
Cambodia
+855
Caribbean Netherlands
+599
Cayman Islands
+1
Chile
+56
Colombia
+57
Congo - Brazzaville
+242
Congo - Kinshasa
+243
Croatia
+385
Cyprus
+357
Czechia
+420
Denmark
+45
El Salvador
+503
Finland
+358
Georgia
+995
Ghana
+233
Greece
+30
Guadeloupe
+590
Guinea
+224
Hong Kong SAR China
+852
Hungary
+36
Iceland
+354
Indonesia
+62
Iran
+98
Iraq
+964
Ireland
+353
Israel
+972
Japan
+81
Kazakhstan
+7
Kenya
+254
Kyrgyzstan
+996
Laos
+856
Latvia
+371
Liberia
+231
Liechtenstein
+423
Malaysia
+60
Mongolia
+976
Nepal
+977
New Zealand
+64
Nigeria
+234
North Macedonia
+389
Norway
+47
Pakistan
+92
Panama
+507
Peru
+51
Poland
+48
Portugal
+351
Romania
+40
Russia
+7
Saudi Arabia
+966
Senegal
+221
Serbia
+381
Sierra Leone
+232
Singapore
+65
Slovenia
+386
Somalia
+252
South Africa
+27
South Sudan
+211
Sri Lanka
+94
St. Pierre & Miquelon
+508
Switzerland
+41
Taiwan
+886
Tajikistan
+992
Tanzania
+255
Thailand
+66
Türkiye
+90
Uganda
+256
Ukraine
+380
Uzbekistan
+998
Vietnam
+84
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Slovakia carrier lookup questions
Short, straight answers about what the lookup can and can't tell you.
How do I find out which network a Slovakia number is on?
Run it through the lookup above: it checks live carrier and porting records and shows the network the number is on today. The prefix alone tells you which network a number range was first issued to - the table on this page lists them - but a Slovakia number can move to another network and keep its digits.
How can I tell if a Slovakia number is a mobile?
Mobile numbers in Slovakia usually start with +421 90, +421 91, +421 94 or +421 95 (090, 091, 094 or 095 when dialled inside Slovakia). The lookup confirms it for any number: it shows the line type - mobile, landline or VoIP.
What is the country code for Slovakia?
Slovakia uses the country code +421. Inside Slovakia numbers are dialled with a leading 0; from abroad you drop that 0 and dial +421 instead.
How do you write a Slovakia phone number?
In international format a Slovakia mobile number looks like +421 912 123 456, and inside Slovakia like 0912 123 456. Mobile numbers have 9 digits after the +421. The lookup also gives you the clean E.164 form (no spaces) that apps and SMS systems expect.
Which mobile networks are there in Slovakia?
The official numbering data names 8 networks with Slovakia number ranges. The ones with the most ranges are T-Mobile (Slovak Telekom), Orange, Telefonica O2 and 4ka of SWAN. Smaller networks often run on one of those, so a number can show a different carrier name in the live check.
Is the phone carrier lookup really free?
Yes. The lookup is completely free and needs no sign-up or credit card. We cover the cost of the live carrier check, so there are no hidden per-search fees.
Does the person know I looked up their number?
No. The lookup is completely passive - we never call, text or otherwise contact the number, and the carrier check reads routing records rather than reaching the phone, so its owner gets no notification of any kind.