SUBNET PRACTICE_
Enter an IP/CIDR or hit random. Solve the network, hosts, broadcast, and adjacent subnets. Each field is graded independently.
[ ▶ ENTER ADDRESS ]✗ Invalid. Use dotted-decimal with prefix — e.g. 10.0.1.50/24
[ GIVEN ADDRESS ]
—
NETWORK ADDRESS
FIRST HOST
LAST HOST
BROADCAST
NEXT SUBNET
PREVIOUS SUBNET
0/0
[ ★ NEED A REFERENCE? ]
Every prefix /8 through /32 — subnet mask, block size, usable hosts, and wildcard mask — in one page you can save or bookmark.
CIDR CHEAT SHEET ▶
[ ★ APPLY IT IN A REAL TOPOLOGY ]
Subnetting makes more sense when you're actually assigning addresses to interfaces. Put your skills to work in a real network — VLANs, inter-VLAN routing, and more._