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ZelNum is a phone number and email verification platform built for developers, marketers, and data teams who need contact data they can trust. Verify a single number in real time or clean an entire list in bulk. With 40+ detection products, ZelNum covers the checks that matter most: WhatsApp number verification, Telegram number checks, HLR lookup, phone status checks, and email verification — all available through one straightforward REST API. Teams use ZelNum to filter invalid numbers before an SMS campaign, keep CRM contact lists clean, screen registrations in real time, and reduce wasted spend on unreachable contacts. Results are delivered as structured data or downloadable files, so it fits both automated pipelines and one-off cleanup projects. Getting started is simple: create an account, generate your API key, and make your first request in minutes. New accounts include free testing credit, so you can evaluate real results before committing to a budget. Whether you need to validate one number at checkout or verify millions of rows a month, ZelNum scales with you — same API, same workflow, from your first test to production volume.
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United States
- zelnum.com
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