LibraTool logoLibraTool
🌐
🖧

Subnet Planning for Network Admins

Plan IP allocation, calculate usable hosts, and size subnets for your network.

Prisijungimo nereikia
/
/0/8/16/24/32
254
Usable hosts
256
Total addresses
Network address192.168.1.0/24
Usable host range192.168.1.1 – 192.168.1.254
Broadcast address192.168.1.255
Subnet mask255.255.255.0
Wildcard mask0.0.0.255
Mask (binary)11111111.11111111.11111111.00000000
IP classC
Address typePrivate (RFC 1918)

IPv4 subnetting reference. /31 and /32 are handled per RFC 3021 (point-to-point and single-host). All math runs locally in your browser.

Network Admin tips

🖧

Before deploying a VLAN, calculate the usable host count to make sure the subnet fits your device count plus growth headroom.

💡

Remember network + broadcast addresses are reserved — a /24 gives 254 usable hosts, not 256.

🎯

Use the binary mask view to teach or double-check VLSM (variable-length subnet masking) boundaries.

Kaip tai veikia

1
Įveskite
Enter your data into the tool above. Everything stays local to your browser.
2
Apdorokite
The tool processes your data instantly in your browser using JavaScript. No server, no waiting.
3
Atsisiųskite
Get your result instantly. Nothing is stored after you leave the page — complete privacy.

Kodėl naudoti mūsų?

✓Visiškai nemokamai — jokių paslėptų išlaidų, niekada
✓Nereikia paskyros, el. pašto ar prisijungimo
✓Failai niekada nepalieka jūsų įrenginio
✓Absoliučiai jokių failo dydžio apribojimų
✓Jokių vandens ženklų jokiame rezultate

Also check out…

🎓

Subnetting Practice for IT Students

Check your subnetting homework and CCNA practice p

🏠

Home Lab & Self-Hosting Subnets

Plan IP ranges for your home network, VLANs, Docke

☁️

Plan Cloud VPC CIDR Blocks

Size AWS/GCP/Azure VPC and subnet CIDR ranges befo

🛡️

CIDR Ranges for Firewall Rules

Convert IP ranges to CIDR notation for firewall al

Dažnai užduodami klausimai

Back to Subnet / CIDR Calculator