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Tool
Calculate subnet ranges, hosts, wildcard masks, and split or merge subnets.
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Network
10.0.0.0
Broadcast
10.0.0.255
Subnet mask
255.255.255.0
Wildcard mask
0.0.0.255
Total hosts
256
Usable hosts
254
Subnet range
10.0.0.0 - 10.0.0.255
Usable range
10.0.0.1 - 10.0.0.254
Normalized CIDR
10.0.0.0/24
1) Enter a CIDR like `10.0.0.0/24` to see ranges and host counts.
2) Use Split by prefix (e.g. /26) or Split by count (power of two).
3) Paste multiple CIDRs to merge into the smallest supernets.
4) Copy results from the text areas for scripts or docs.
CIDR `/24` means the first 24 bits are the network, the rest are hosts.
Subnet mask = network bits set to 1 (e.g. /24 → 255.255.255.0).
Wildcard mask is the inverse of the subnet mask.
Network address is the first IP, broadcast is the last IP in the range.
/31 and /32 have special host rules and are shown without usable range.
Visualization is hidden. Click "Show visualization" to open it.
No split results yet. Generate subnets to populate the table.
Master your network planning with these simple steps for calculating subnets and host ranges.