Network
Subnets, CIDR, URLs, ports and permissions.
CIDR / Subnet Calculator
Compute network, broadcast, mask and host range for an IPv4 CIDR block.
URL Parser
Break a URL into protocol, host, path, and query parameters.
HTTP Status Codes
Searchable reference of HTTP response status codes and their meanings.
chmod Calculator
Convert between octal, symbolic and checkbox file permissions.
User-Agent Parser
Break down a browser User-Agent string into browser, engine, and OS.