Subnetting Practice for IT Students
Check your subnetting homework and CCNA practice problems instantly.
IPv4 subnetting reference. /31 and /32 are handled per RFC 3021 (point-to-point and single-host). All math runs locally in your browser.
IT Students tips
Studying for CCNA / Network+? Work the problem by hand, then verify network, broadcast, and host range here.
The binary mask and wildcard mask help connect the dot-decimal notation to what's happening bit-by-bit.
Practice the /25, /26, /27, /28 boundaries — these are the most common exam questions.
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