Split a parent CIDR block into equal subnets. Enter 192.168.0.0/16 and target /24 for a full table of network, broadcast, and host ranges.
Added Jun 1, 2026
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Result
Enter a value for parent cidr block to see your result.
Divides a parent CIDR block into equal subnets of a chosen prefix length. Lists every resulting network, broadcast address, host range, and usable host count — ideal for VLAN planning, cloud VPC subnet design, and network documentation.
A /16 split into /24 yields 256 subnets of 254 hosts each — typical VLAN design.
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Dividing a /24 into four /26 subnets gives 62 usable hosts per segment.
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Result
Enter 192.168.0.0/16 as the parent and 24 as the target prefix. The difference (24 − 16 = 8) means 2⁸ = 256 subnets. Each /24 has 254 usable host addresses.
CIDR blocks are defined from the network address — the address with all host bits set to zero. 10.0.0.0/8 is valid; 10.0.0.5/8 is not, because .5 has host bits set. Use the Subnet Calculator to find the network address first.
The number of subnets is 2^(target prefix − parent prefix). Splitting /8 into /16 creates 256 subnets; /8 into /24 creates 65 536. The table shows up to 512 rows for performance.