CheckNumber.AI
Phone Number Validation
NEWValidate numbering format, line type, and reachability signals before running platform-specific checks
Account match Live signal Export-ready
View in all products No-code CSV REST API Exportable results
Validate & Score Phone Numbers
Go beyond "is this number real" — clean dead numbers and surface the ones most likely to respond.
3
checkers
CSV + API
bulk workflows
Phone Number Validation Number Active Checker High-value Users CheckerNo account, number, or SIM required
Every check runs through official platform APIs on our own infrastructure. You never connect, bind, or use your own account, phone number, or SIM card — just upload your list or call the API and get results.
CheckNumber's number checker validates and scores raw phone numbers before you spend on them, without sending a message or storing the number. Upload a CSV or call the REST API, and every row comes back with format and line-type validation, an activity level, and a high-value user signal, ready to clean, segment, or route into your CRM.
What CheckNumber detects for Number Checker
Format and validity
Validates whether each phone number is correctly formatted and a valid, reachable number, so malformed rows are caught before you use the list.
Country and region
Identifies the country the number belongs to, so you can route, segment, or filter lists by geography.
Line type
Detects the line type such as mobile, landline, or VoIP, useful for choosing the right outreach channel.
Activity level
Returns an activity level of active, inactive, or unknown, derived from device, carrier, and internet behaviour signals, so you can prioritise reachable numbers.
High-value user signal
Flags numbers that show high-value user characteristics, helping you prioritise the most promising leads.
What You Can Check
Pick the right Number Checker signal
Choose the exact check you need for Number Checker. Use upload-based batches or integrate with the same pricing through API.
Number Active Checker
NEWDetect phone number activity level via big-data analytics to improve SMS delivery and reduce costs
Account match Live signal Export-ready
View in all products High-value Users Checker
NEWIdentify high-value phone users via big-data signals for better targeting and prioritization
Account match Live signal Export-ready
View in all products Common Use Case
Improve Number Checker list quality before outreach
Cut wasted SMS/call spend by filtering your list down to valid, active, high-value numbers first.
No-code CSV REST API Exportable results
Signal 1
Validate and clean — catch malformed, invalid, or wrong-country numbers before they waste spend.
Signal 2
Activity level — see whether each number is active, inactive, or unknown using device, carrier, and behaviour signals.
Signal 3
High-value signal — flag numbers with high-value user characteristics to prioritise your best leads.
Number Checker FAQ
What does the number checker validate?
It checks each number's format and validity, identifies the country and line type such as mobile, landline, or VoIP, and can add an activity level and a high-value user signal, depending on the task type you choose.
How is the activity level determined?
The active-check task combines big-data analytics across device, carrier, and internet behaviour signals to label each number as active, inactive, or unknown, without contacting the number.
Can I run number validation in bulk?
Yes. Upload a CSV of up to hundreds of thousands of numbers or call the REST API, choose the task type you need, then download a result file per number. You are billed only for successful checks.
Is there a free trial?
Yes. New accounts receive 1,000 free checks on signup with no credit card, and every check is pay-as-you-go with no monthly fee, and the credits you top up never expire.
Refer & Earn 10%
Earn 10% Commission on Every Recharge — For Life
Share your unique referral link. When someone signs up through it and tops up their account, you instantly receive 10% of the amount paid as bonus credit — no expiry, no cap.
- 10% commission on every recharge your referrals make
- Bonus credit is applied automatically — no withdrawal steps
- Lifetime referral link — earn forever, not just once
10%
Learn how it workscommission per recharge