Open API

The Most Comprehensive
DNS Intelligence API

The most comprehensive DNS intelligence API. 36 endpoints for DNS lookups, domain intelligence, email security, and more.

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Example Request 
curl -H "X-API-Key: YOUR_KEY" \
  "https://api.dnstoolkit.io/dns/propagation?domain=example.com"
35 API Endpoints
6 Categories
20+ Global Resolvers
JSON & Markdown Output

Explore by Category

Everything you need for DNS intelligence, domain research, and security auditing.

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DNS

Core DNS lookup, propagation, and analysis tools

11 tools
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Domain

Domain intelligence — WHOIS, availability, and registration data

9 tools
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Email

Email security and validation tools

3 tools
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IP

IP address intelligence — reverse DNS, ASN, and blacklists

3 tools
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Security

DNS security auditing, certificates, and vulnerability detection

5 tools
🕸️

Web

Web technology detection, port scanning, and redirect tracing

4 tools

Built for Developers

⚡

Fast & Reliable

Concurrent DNS resolution with intelligent caching. Sub-second responses for most queries.

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Secure by Design

API key authentication, HTTPS everywhere, and no data logging. Your queries stay private.

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Dual Output Formats

Every endpoint returns JSON for programmatic use or Markdown for human-readable reports.

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Global Coverage

20+ resolvers worldwide, GeoLite2 IP intelligence, and support for all DNS record types.

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