Network

VLSM Calculator

Variable Length Subnet Masking (VLSM) — divide a network into subnets of different sizes based on host requirements. Enter a base CIDR (e.g. 192.168.1.0/24 ) and a list of required hosts. Subnets are allocated largest-first for efficient address usage.

Enter number of usable hosts per subnet. Labels are optional (e.g. "Office: 50").
Total Addresses256
Used116
Remaining140
Subnet 1192.168.1.0/26
Needed / Allocated50 / 62 hostsSubnet Mask255.255.255.192Network / Broadcast192.168.1.0 / 192.168.1.63Usable Range192.168.1.1 - 192.168.1.62
Subnet 2192.168.1.64/27
Needed / Allocated30 / 30 hostsSubnet Mask255.255.255.224Network / Broadcast192.168.1.64 / 192.168.1.95Usable Range192.168.1.65 - 192.168.1.94
Subnet 3192.168.1.96/28
Needed / Allocated10 / 14 hostsSubnet Mask255.255.255.240Network / Broadcast192.168.1.96 / 192.168.1.111Usable Range192.168.1.97 - 192.168.1.110
Subnet 4192.168.1.112/30
Needed / Allocated2 / 2 hostsSubnet Mask255.255.255.252Network / Broadcast192.168.1.112 / 192.168.1.115Usable Range192.168.1.113 - 192.168.1.114
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2026