Split a network into right-sized subnets for each team.
Allocate largest first: 192.168.1.0/25 for 100 hosts, 192.168.1.128/26 for 50, 192.168.1.192/27 for 20 and 192.168.1.224/30 for 2. That leaves 28 free addresses starting at 192.168.1.228.
Splits a network into subnets of different sizes, largest first, without overlaps. Each subnet reserves the network and broadcast addresses; /31 and /32 are not allocated.
size = next power of 2 ≥ hosts + 2; prefix = 32 − log2(size); allocated largest firstSplits a network into subnets of different sizes, largest first, without overlaps. Each subnet reserves the network and broadcast addresses; /31 and /32 are not allocated.
All amounts use the same currency of your choice. These are estimates, not measurements or offers.
Plan the addressing of an office, a lab or a networking exercise: type the starting network with its prefix and how many hosts each subnet needs. The calculator allocates the largest first so no addresses are wasted, and gives the network, usable range and broadcast of each subnet.
Each result row shows in brackets its position in your list and the hosts requested. Leave room to grow: if a team has 50 devices today, ask for 60 or more. Free addresses at the end are available for future subnets. If everything does not fit, start from a shorter prefix, for example /23 instead of /24.
Because every conventional subnet reserves the network and broadcast addresses, which cannot be assigned to devices.
That way each block starts at an address aligned with its size and no unusable gaps are left between subnets.
A /30 with 2 usable hosts, or a /31 if your devices support it (RFC 3021), which this calculator does not allocate.