THE WORKBENCH / 12 USEFUL TOOLS
Less tab hunting.
More useful answers.
Subnet math, address planning, local MAC-vendor lookup and practical diagnostics. Choose a tool, run it, then copy or download the result.
IPCALC
IPv4 subnet calculator
Choose your tool and enter its values.
Ready.
Local by default. DNS queries go to Google Public DNS on submission; no queries use your private corporate resolver. MAC addresses are matched in this browser against an IEEE snapshot, not sent to a vendor API. IPv4 /31 counts assume point-to-point links; IPv6 has no broadcast address.