# 1Lookup (1lookup.io)

Checks phone numbers against carrier and do-not-call data and verifies emails, IPs and domains through a single API.

- Atlas card: https://inite.ai/en/atlas/1lookup.io
- Site: https://1lookup.io
- For: Teams that need to validate phone, email and IP data for outreach, prospecting or fraud checks
- Categories: voice
- Use not measured/100 · alive 100/100

## Used for

- verify phone numbers for line status and risk
- check whether email addresses are deliverable
- detect VPN and proxy traffic on logins

## Price

- from 99 USD/month, no free plan (read 2026-10-15 on https://1lookup.io/pricing)

## For developers

- OpenAPI: https://1lookup.io/openapi.json (42 paths)
- API docs: https://app.1lookup.io/api
- MCP server: io.1lookup/1lookup (namespace; auth on 2026-10-15)
- Read 2026-10-15

## Your data

- Certifications stated: gdpr, ccpa, pci
- Training on your data: no (https://1lookup.io/privacy)
- Read 2026-10-15

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Source: INITE Atlas, https://inite.ai/en/atlas/1lookup.io. JSON: https://inite.ai/api/atlas/1lookup.io. MCP: https://inite.ai/api/mcp (atlas_lookup).