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 β these are the most common exam questions.
How It Works
Why use ours?
Also check outβ¦
Subnet Planning for Network Admins
Plan IP allocation, calculate usable hosts, and si
Home Lab & Self-Hosting Subnets
Plan IP ranges for your home network, VLANs, Docke
Plan Cloud VPC CIDR Blocks
Size AWS/GCP/Azure VPC and subnet CIDR ranges befo
CIDR Ranges for Firewall Rules
Convert IP ranges to CIDR notation for firewall al