VLSM Subnetting Calculator
Enter the network block you want to split (like 192.168.0.0/24) and each department's required host count, and VLSM (Variable Length Subnet Masking) allocates the biggest needs first so nothing goes to waste. Copy the allocation results with one click.
VLSM 계산기, 서브네팅 계산기, 가변 길이 서브넷 마스크, vlsm calculator, subnetting calculator, variable length subnet mask, network address allocation- Created
- 2026.09.05
- Updated
- 2026.09.16
Block to split
256 addresses totalRequired subnets
4 requirementsAllocation
Within 192.168.0.0/24Each subnet is sized to the nearest power of two that covers the requested hosts plus the network and broadcast addresses. Larger requirements are placed first, so the result order can differ from the input order. A 2-host link (like a router-to-router connection) uses /30.
Favorites Ctrl + N
How to use
Enter the network block to split (e.g. 192.168.0.0/24).
Add a name and required host count for each department or purpose, one per row.
Check the allocation — largest requirements placed first — and save it with the copy button.