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Web & Network
Subnets, URLs and HTTP references - 5 working tools
Subnet / CIDR Calculator
Network, broadcast, mask and host range for an IPv4 block.
IP Address Converter
Convert an IPv4 address to integer, hex and binary.
URL Parser
Split a URL into protocol, host, path, query and fragment.
HTTP Status Code Reference
Look up what common HTTP status codes mean.
MAC Address Formatter
Validate a MAC address and show it in common formats.