Check phone, email and account lists from Excel
About Checknumber
Checknumber is a web workspace for checking contact lists. Upload XLSX, CSV or TXT, choose a check, review the cost and export the results. Available checks include WhatsApp and Telegram registration, email deliverability and selected account or profile checks. Excel exports can keep the original columns alongside the results. Checks are paid by volume; minimum billable quantities, coverage and availability vary by product. A positive result does not guarantee future message delivery.
PlatformsWeb
✓ VerifiedOct 18, 2026
Key features
- Import XLSX, CSV and TXT contact lists
- WhatsApp and Telegram registration checks
- Email deliverability checks
- Cost estimate before starting a check
- Excel exports with original columns and results
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Checknumber
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