Network & Web
Tools for investigating networks and the web: subnet calculation, URL parsing and looking up HTTP status codes.
4 tools・Ordered by measured page views over the last 90 days.
Browser Info Viewer
A free tool that shows your browser type and version, screen/window size, IP, language, time zone, GPU, and more, all on one screen.
Subnet Calculator
From an IPv4 address and CIDR/mask, compute the network, broadcast, host range, and host count.
URL Parser
Break a URL into protocol, host, path, query parameters and hash. Parameters are percent-decoded and listed.
HTTP Status Codes
Look up what 200, 301, 401, 403, 404, 429 and 502 mean by number or name, with notes on 401 vs 403 and 301 vs 302.