Browser-based network diagnostics. No installs required — uses public APIs and browser APIs to gather what's accessible from your browser.
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⚠ Browser fetch latency includes DNS, TLS, and server processing time. CORS and cache affect accuracy. Results are indicative, not precise network RTT.
Enter an IP or leave blank to look up your own.
Uses Cloudflare's DNS-over-HTTPS API (1.1.1.1). Supports A, AAAA, MX, TXT, CNAME, NS records.
# Type a domain and hit Lookup
Attempts to fetch a resource from common ports. Result depends on CORS and server config — a "timeout" typically means the port is closed or blocked. This tests reachability, not true open/closed state.
# Enter a host and run check
Fetches response headers via CORS. Only headers the server allows to be exposed will show. Uses a CORS proxy if needed.