Network
免費線上Network。在瀏覽器中即時處理資料。無上傳，無註冊，完全私密。
Local processingNetwork 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.
DNS Lookup
Query DNS records (A, AAAA, MX, TXT, CNAME, NS, SOA) for any domain.
WHOIS Lookup
Retrieve WHOIS registration info for a domain.
SSL Certificate Checker
Inspect a website's SSL/TLS certificate chain, expiry, and issuer.
HTTP Header Checker
View HTTP response headers including security headers (CSP, HSTS, X-Frame-Options).
URL Availability Checker
Check if a URL is reachable and measure response time.
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
這個Network免費嗎？
是的，完全免費。無需註冊。
這個工具會上傳我的資料嗎？
不會。所有處理都在瀏覽器中本機完成。您的資料永遠不會離開您的裝置。