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FreeOnlineTools

Network

Free online network. Process data instantly in your browser. No upload, no signup, fully private.

Local processing

Network Tools

Network tools run on Cloudflare Pages Functions (edge) with RESTful versioned endpoints (/api/v1/network/*). All endpoints enforce rate limiting, input validation, timeouts, and SSRF protection (no arbitrary URL fetch).

IP Lookup

Find your public IP address (IPv4/IPv6) and geolocation.

/api/v1/network/ip
🔒 Returns only the requester IP and geo-IP data.

DNS Lookup

Query DNS records (A, AAAA, MX, TXT, CNAME, NS, SOA) for any domain.

/api/v1/network/dns
🔒 Domain query is sent to Cloudflare DNS resolver.

WHOIS Lookup

Retrieve WHOIS registration info for a domain.

/api/v1/network/whois
🔒 Domain query is sent to WHOIS servers via edge function.

SSL Certificate Checker

Inspect a website's SSL/TLS certificate chain, expiry, and issuer.

/api/v1/network/ssl
🔒 Domain query triggers TLS handshake from edge.

HTTP Header Checker

View HTTP response headers including security headers (CSP, HSTS, X-Frame-Options).

/api/v1/network/headers
🔒 URL is fetched from edge with SSRF protection (allowlist enforced).

URL Availability Checker

Check if a URL is reachable and measure response time.

/api/v1/network/ping
🔒 URL is fetched from edge with timeout and SSRF protection.

Security measures

  • Rate limiting: Per-IP token bucket to prevent abuse.
  • SSRF protection: External fetch allowlist; private IP ranges blocked.
  • Input validation: All domain/URL inputs validated and sanitized.
  • Timeouts: 5s default per upstream request.
  • CORS: Restricted to FreeOnlineTools origins.

Usage example

# IP lookup
curl https://freeonlinetools.top/api/v1/network/ip

# DNS lookup
curl "https://freeonlinetools.top/api/v1/network/dns?domain=example.com&type=A"

# SSL check
curl "https://freeonlinetools.top/api/v1/network/ssl?domain=example.com"

Note: Network tools require the edge service layer. Browser-only tools (image, text, crypto, etc.) process data locally and never send requests to these endpoints.

How to Use

Enter your input above. The result updates automatically. Use the copy button to copy the result.

Privacy

All processing happens in your browser. Your data is never uploaded to any server.

FAQ

Is this Network free?

Yes, completely free. No signup required.

Does this tool upload my data?

No. All processing happens locally in your browser. Your data never leaves your device.

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