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HTTP Header Inspector

Enter a URL to fetch response headers, status code, redirect chain, and CORS headers. The request is made from our server; internal/private URLs are blocked.

Example

Enter https://api.github.com and click Inspect to see status, headers, and CORS. Only http and https URLs are allowed; localhost and private IPs are blocked.

FAQ

No. Our server performs the request (HEAD) so you can inspect any public URL. We do not store the URL or response.
For security we block private IP ranges (127.x, 10.x, 192.168.x, 172.16–31.x) and internal hostnames.

API / Network Tools

IP Address Lookup

Look up country, ISP, and location for an IP.

IP Subnet Calculator

Subnet mask, network, broadcast, host range from IP/CIDR.