pjhtech ToolsEnter the parent IPv4 network and one required host count per LAN. The result gives a subnet and usable capacity for every request, with the largest allocations placed first. Request numbers refer to your original input order.
Example: 90, 40 and 12 hosts fit into a /24 as /25, /26 and /28. Starting at 10.42.20.0 gives networks .0/25, .128/26 and .192/28, leaving .208–.255 unallocated.
Ordinary LAN allocations reserve network and broadcast addresses. Even a one-host request receives /30; this tool does not allocate point-to-point /31s or include cloud-specific reservations. If the requests do not fit, use a larger parent or reduce the requested capacities.