TechFuel HQWorked examples
These are this calculator’s own outputs, computed with the same formula the tool runs in your browser — so you can see a real answer without touching a single input.
The default home/homelab LAN — a consumer router handing out 192.168.1.x. IP 192.168.1.0, prefix /24, no split. (This is exactly the tool’s default state on page load.)
- Inputs: IPv4 address = 192.168.1.0, Prefix = /24, Split into = (no split)
- Result: Network address 192.168.1.0/24 | Broadcast address 192.168.1.255 | Usable host range 192.168.1.1 - 192.168.1.254 | Usable hosts 254 (256 total addresses) | Subnet mask 255.255.255.0 | Wildcard mask 0.0.0.255 | Address type Private (RFC 1918 - not internet-routable)
Carving the same home /24 into four VLANs (main, IoT, guest, cameras) — IP 192.168.1.0, prefix /24, split into /26. The dropdown option reads “/26 (4 subnets)”
- Inputs: IPv4 address = 192.168.1.0, Prefix = /24, Split into = /26
- Result: Heading “Split /24 into 4 x /26 subnets”, table rows: 1) 192.168.1.0/26, 192.168.1.1-192.168.1.62, bcast 192.168.1.63, 62 hosts. 2) 192.168.1.64/26, 192.168.1.65-192.168.1.126, bcast 192.168.1.127, 62 hosts. 3) 192.168.1.128/26, 192.168.1.129-192.168.1.190, bcast 192.168.1.191, 62 hosts. 4) 192.168.1.192/26, 192.168.1.193-192.168.1.254, bcast 192.168.1.255, 62 hosts. (Cards above still describe the parent /24.)
A homelab host address that is NOT the start of its block — a Proxmox node at 10.0.30.75 on a /22 lab network. Shows that the tool snaps the entered address down to its network address
- Inputs: IPv4 address = 10.0.30.75, Prefix = /22, Split into = (no split)
- Result: Network address 10.0.28.0/22 | Broadcast address 10.0.31.255 | Usable host range 10.0.28.1 - 10.0.31.254 | Usable hosts 1,022 (1,024 total addresses) | Subnet mask 255.255.252.0 | Wildcard mask 0.0.3.255 | Address type Private (RFC 1918 - not internet-routable)
How to use this calculator
Type an IPv4 address and choose a CIDR prefix (the /24 part). The calculator instantly shows the network address, broadcast address, the usable host range, total and usable host counts, the subnet mask, and the wildcard mask — and tells you whether the address is private, public, or special-use. To plan VLANs or segments, set a longer split prefix and it lists every child subnet.
Everything runs in your browser; nothing is sent anywhere. The result is encoded in the URL, so you can copy a link to a specific calculation.
What CIDR notation actually means
CIDR (Classless Inter-Domain Routing) describes a network by how many leading bits are fixed. /24 means the first 24 of 32 bits are the network, leaving 8 for hosts — 256 addresses, 254 usable. Each extra bit halves the block: /25 = 128, /26 = 64, /27 = 32. It replaced the rigid Class A/B/C system, so you size a network to what you need instead of jumping in huge steps.
The two addresses you never assign to a device are the network address (first, all host bits 0) and the broadcast address (last, all host bits 1) — which is why usable hosts is total minus 2 (except /31 point-to-point links and /32 single hosts).
Private vs. public ranges
| Range | CIDR | Use |
|---|---|---|
| 10.0.0.0 – 10.255.255.255 | 10.0.0.0/8 | Private (RFC 1918) |
| 172.16.0.0 – 172.31.255.255 | 172.16.0.0/12 | Private (RFC 1918) |
| 192.168.0.0 – 192.168.255.255 | 192.168.0.0/16 | Private (RFC 1918) |
| 100.64.0.0 – 100.127.255.255 | 100.64.0.0/10 | Carrier-grade NAT |
| 169.254.0.0 – 169.254.255.255 | 169.254.0.0/16 | Link-local (APIPA) |
| 127.0.0.0 – 127.255.255.255 | 127.0.0.0/8 | Loopback |
Home and homelab networks live in the RFC 1918 ranges — most consumer routers default to a 192.168.x.0/24. If you’re segmenting a homelab into VLANs, the split feature above makes carving a /24 into per-VLAN /26s or /27s straightforward.
What this pairs with
Planning the physical side of the network too? The PoE power budget calculator sizes a switch for your APs and cameras, the Wi-Fi 7 homelab guide covers the wireless layer, and the budget networking gear guide rounds up switches and routers worth buying.