All tools

IP Subnet Calculator

Enter an IP and CIDR to get subnet mask, network address, broadcast address, and host range. All in your browser.

IP / CIDR e.g. 192.168.1.0/24

Example

192.168.1.0/24

API / Network Tools

HTTP Header Inspector

Inspect status, headers, redirects, and CORS for any URL.

IP Address Lookup

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