This free Costa Rican phone number checker shows whether a number is valid.
A Costa Rican phone number checker tells you whether a number is real, which means it follows Costa Rica's numbering rules and is assigned. Enter a +506 number above and 1Lookup's free checker returns valid or invalid in seconds, with the line type and country, checked against Costa Rica's numbering plan.
Pick the country, then enter the number without the country code.
Free & rate-limited. No signup required to try.
- Country code
- +506
- Mobile numbers
- 8 digits after +506, starting 5, 6, 7 or 8
- Landlines
- 8 digits after +506, starting 2, such as +506Â 2XXXÂ XXXX
- Written at home
- 8312 3456
- Written for apps and SMS
- +50683123456
- Dialed from the US
- 011 506 8312 3456
A Costa Rican mobile number is +506 followed by 8 digits, and the first one is 5, 6, 7 or 8.
Written with the country code
- +506Country code
- 8Mobile start
- 312 34567 more digits
The +506 comes before the number and is dropped when you dial inside Costa Rica.
A Costa Rican phone number checker reads a number's format first and then checks it against Costa Rica'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 8312 3456, or paste it with +506.
- Its format is checkedEach type of number has its own rules. A mobile needs 8 digits after +506 and starts with 5, 6, 7 or 8 at home.
- 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 Costa Rica'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.
A Costa Rican mobile number has 8 digits after +506 and starts with 5, 6, 7 or 8, so any other length is not a valid mobile.
These lengths come from the numbering data for Costa Rica. The numbering data also lists one small mobile range starting 3005, which this page leaves out.
| Number type | Starts with at home | Digits after +506 | Written at home |
|---|---|---|---|
| Mobile | 5, 6, 7 or 8 | 8 | 8312 3456 |
| Landline | 2 | 8 | 2XXX XXXX |
Three common mistakes make a Costa Rican number fail the check, and each one is quick to fix.
Repeating +506 adds digits.
Write +506 8312 3456 once, with the country code at the front.
Typing too few or too many digits makes a number invalid.
A mobile number has 8 digits after +506. With 7 or 9 it cannot be a valid mobile, 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 Costa Rica selected for a +506 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 Costa Rican phone numbers.
How do I check if a Costa Rican phone number is valid?
Enter the number in the box above with Costa Rica 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 8312 3456, or in full as +506 8312 3456.
How many digits is a Costa Rican phone number?
A mobile number has 8 digits after +506. A landline has 8 digits after +506, such as +506 2XXX XXXX.
What does a Costa Rican mobile number start with?
Mobile numbers start with 5, 6, 7 or 8 at home, which is 5, 6, 7 or 8 after +506. The numbering data also lists one small mobile range starting 3005, which this page leaves out.
How do I write a Costa Rican number for an app or an SMS tool?
Use the E.164 form: a plus sign, 506, then the number and no spaces, such as +50683123456.
Does the Costa Rican 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 Costa Rican number is active?
No. Valid means the number is real, correctly written for Costa Rica 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 Costa Rican 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.
You can check numbers from other countries on their own pages.
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These free tools answer the next question about a number.
- The +506 country code pageHow to dial Costa Rica, 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.