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Subnet Calculator
IPv4 CIDR + VLSM math, done in your browser. No network calls.
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Network Address192.168.1.0
Broadcast Address192.168.1.255
Subnet Mask255.255.255.0
Wildcard Mask0.0.0.255
CIDR Notation192.168.1.0/24
Total Addresses256
Usable Hosts254
First Usable Host192.168.1.1
Last Usable Host192.168.1.254
IP ClassC — Historic /24 range
Note: classful addressing (A/B/C/D/E) is largely historical since CIDR replaced it in 1993, but it still shows up on CCNA / Network+ / Security+ exams.
Split this network into smaller subnets
VLSM (Variable Length Subnet Masking) — carve /24 into equal-size children.
New CIDR: /26 · Total possible subnets: 4
| # | Network | Usable Range | Broadcast | CIDR |
|---|---|---|---|---|
| 1 | 192.168.1.0 | 192.168.1.1 – 192.168.1.62 | 192.168.1.63 | /26 |
| 2 | 192.168.1.64 | 192.168.1.65 – 192.168.1.126 | 192.168.1.127 | /26 |
| 3 | 192.168.1.128 | 192.168.1.129 – 192.168.1.190 | 192.168.1.191 | /26 |
| 4 | 192.168.1.192 | 192.168.1.193 – 192.168.1.254 | 192.168.1.255 | /26 |