Networking & web
CIDR/subnet math, user-agent parsing, URL and cURL tools.
URL parser
Break a URL into its protocol, host, path, query parameters and fragment.
IP subnet / CIDR calculator
Work out the network, broadcast, netmask, wildcard, host range and usable hosts from an IP and CIDR prefix.
IP address converter
Convert an IPv4 address between dotted decimal, integer, hex, octal and binary, and expand or compress IPv6.
UTM campaign URL builder
Build trackable campaign links with utm_source, utm_medium, utm_campaign and more — then copy the tagged URL.
HTTP status codes
A searchable reference of HTTP status codes — what 200, 301, 404, 418, 500 and the rest actually mean.
User-Agent parser
Paste a User-Agent string (or use your own) to detect the browser, operating system, engine and device.