Subnets worked out properly.
An online IPv4 subnet calculator for planning VLANs, firewall interfaces and address space. Enter a network, get the mask, range and host counts, then split it or plan it with VLSM.
Accepts 192.168.1.0/24, 192.168.1.0 255.255.255.0 or 192.168.1.0 0.0.0.255.
Divides a network into equal subnets. For different sizes per subnet, use the VLSM planner.
Largest subnets are placed first so every block stays aligned. Host counts exclude the network and broadcast addresses.
Every IPv4 prefix length with its mask, wildcard and host counts.
Built by the people who build the networks
The Computer Lab DCL designs and supports firewalls, virtual servers, remote access and Windows domains. This tool is the one we use when we lay out VLANs for a new office.
Plan with room to grow
Size each VLAN for roughly double today's devices. Renumbering a live network is far more work than a larger mask.
Use private ranges
Stick to 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16 internally, and avoid ranges that clash with the networks your VPN reaches.
Let us design it
VLAN layout, firewall rules and DHCP to match, documented and handed over. Start an enquiry.