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Free Network Tools

A suite of professional-grade tools for developers, security teams, and DevOps. All run in your browser — no installs, no command line.

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Bulk Lookup

Paste up to 100 IPs or domains. Get geo, ASN, hostname, DNS counts in one go. Export CSV/JSON. In partnership with check-host.net.

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DNS Propagation

Check DNS records across 8 global resolvers (Google, Cloudflare, Quad9, OpenDNS, +4 more). Detect propagation issues.

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SSL/TLS Inspector

Inspect a certificate: issuer, expiry, SANs, signature algorithm, and security grade. Catch expiring certs early.

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HTTP Headers Analyzer

Inspect response headers + security score. Audits HSTS, CSP, X-Frame-Options, COOP, and more.

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Reverse DNS

PTR lookup with forward-confirmation check. Detect mail-server, CDN, or hosting infrastructure.

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API Playground

Try the HostInfo API live — IP, domain, ASN, DNS, WHOIS endpoints with instant response viewer + cURL snippets.

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Need to integrate this into your app?

All these tools are powered by the HostInfo API. Get a free key with 1,000 lookups/day — no credit card required.

Get free API key → Read docs