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ZelNum

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ZelNum is a self-service phone and email verification platform that works in two forms: an online bulk screening app for operations teams and a realtime REST API for developers. No monthly fee, no seat licence — pay as you go per lookup. Teams working with large contact lists open the browser, paste numbers or email addresses, or upload CSV and TXT files. A single bulk run screens up to hundreds of thousands of records and validates phone status, live activity, carrier and line type, HLR-style network signals, phone model, and duplicate or invalid records. Results export as structured files with clean segments for list cleaning, CRM preparation, messaging operations, community management, and data workflows. Account-signal checks run across phone numbers and email addresses on WhatsApp, Telegram, Facebook, TikTok, iMessage, RCS, Zalo, LINE, Viber, Instagram, LinkedIn, Snapchat, Signal, BAND, Amazon, Apple ID, and Microsoft, together with supported crypto exchanges such as Binance, KuCoin, CoinW, and HTX. Depending on the product, checks can include activity, account-age, username, and selected profile signals. Developers get the same coverage through the API: 14 realtime lookups answered in-request for single-number checks and 44 bulk products that run as asynchronous jobs with task submission, status monitoring, and result retrieval — 58 products in total, phone and email, one API key. The API is authenticated with standard keys and documented with a full OpenAPI specification.

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