ZelNum is a web-based verification service for phone numbers, email addresses, and messaging accounts. Run a single lookup, upload a CSV, or send numbers through the API. It returns registration status, account age, carrier, line type, country, and VoIP risk, and splits bulk results into downloadable files (valid, inactive, risk-review) you can feed straight into a CRM or dialer.
What is ZelNum?
Input is a phone number or email address — pasted in, uploaded as CSV/TXT, or sent as JSON to the REST API at api.zelnum.com. The service checks that identifier against messaging apps, social platforms, carrier networks, and crypto exchanges. The app runs in the browser at app.zelnum.com, no install. There are 58 individual check tools (45 phone, 13 email) grouped into WhatsApp, Telegram, phone validation, carrier lookup, and account-verification suites.
What makes ZelNum stand out?
- WhatsApp suite: a number checker for registration and list cleaning, an account-age checker for activation timing, and an online check for one number's live status. Start with the WhatsApp number checker to test your list.
- Telegram suite: the same three-tool structure: registration, account age, online presence. See the Telegram number checker for details.
- Carrier and line-type data: flags invalid, unreachable, recycled, and VoIP-risky records before you spend money on SMS or import a list into your CRM.
- Platform coverage: registration checks for WhatsApp, Facebook, Apple ID, Amazon, Microsoft, iMessage, Messenger, Viber, Signal, Snapchat, LINE, Zalo, RCS, plus crypto exchanges including Binance, KuCoin, and CoinW.
- Bulk workflow: CSV/TXT uploads up to 50 MB and 2,000,000 identifiers per job come back as segmented downloads, so you keep evidence of what was removed.
- Async API: submit a job, poll the task, download results. Pay per lookup, no subscription.
Who should use ZelNum?
CRM and marketing ops teams cleaning a list before import. SMS campaign managers checking WhatsApp registration and line type before paying for send volume. Fraud and risk analysts reviewing registration and carrier signals. Developers wiring lookups into a product pipeline through the REST API.
What can you do with ZelNum?
- Split a phone list into valid, inactive, and risk-review files instead of one undifferentiated export.
- Check which numbers have WhatsApp or Telegram accounts, and how old those accounts are, before picking a channel.
- Pull carrier and line-type data to drop VoIP and unreachable numbers ahead of an SMS send.
- Test one number or email against many platforms at once to see where an account exists.
How does it work?
- Upload a file, paste records, or call the API.
- Run registration, age, carrier, and risk checks.
- Download the segmented results.
Pricing
Pay-as-you-go: bulk jobs are billed per 10,000 rows, realtime lookups per check. Single-number tools are free. WhatsApp checks run $0.50 per 10,000, Telegram $1.50, HLR lookup $4; crypto exchange checks are priced per product. New accounts get $1 in trial credit.
FAQ
Is ZelNum free? The single-lookup tools are free for one-record checks. Bulk files and API jobs are pay-as-you-go — for example $0.50 per 10,000 WhatsApp lookups.
Does ZelNum message the numbers it checks? No. A lookup returns a registration signal only. ZelNum does not message numbers or touch account content.
What file formats does it accept? CSV and TXT, one identifier per line, up to 50 MB. Results come back segmented: valid, inactive, risky, enriched.
How accurate is the data? It depends on the platform, country, and data source. ZelNum positions results for list cleaning and risk review, not as proof of account ownership.
Is there an API? Yes — phone validation, carrier lookup, WhatsApp, and Telegram. Jobs are asynchronous: submit, poll, download.
Alternatives
Twilio Lookup is the big-name option in this space. ZelNum competes on bulk batch size and per-10,000 pricing.
