Subnet Calculator
Calculate IPv4 ranges, classify network space, split parent CIDRs, plan VLSM allocations, detect overlaps, and hand scan targets to Nmap Builder.
192.168.1.0
Network
192.168.1.255
Broadcast
192.168.1.1
First host
192.168.1.254
Last host
254
Usable
256
Total
Calculation details
CIDR
192.168.1.0/24
Subnet mask
255.255.255.0
Wildcard mask
0.0.0.255
IP class
Class C
Nmap target
192.168.1.0-192.168.1.255
Masscan target
192.168.1.0/24
Binary
IP: 11000000.10101000.00000001.10000010
Mask: 11111111.11111111.11111111.00000000
Network: 11000000.10101000.00000001.00000000
Bulk CIDR table and overlap detection
| CIDR | Network | Broadcast | Usable | Class |
|---|---|---|---|---|
| 10.0.0.0/24 | 10.0.0.0 | 10.0.0.255 | 254 | Private RFC1918 |
| 10.0.0.128/25 | 10.0.0.128 | 10.0.0.255 | 126 | Private RFC1918 |
| 192.168.1.0/24 | 192.168.1.0 | 192.168.1.255 | 254 | Private RFC1918 |
Overlap check
- - 10.0.0.0/24 overlaps 10.0.0.128/25
Subnet splitter
10.10.0.0/26
10.10.0.0 - 10.10.0.63
62 usable
10.10.0.64/26
10.10.0.64 - 10.10.0.127
62 usable
10.10.0.128/26
10.10.0.128 - 10.10.0.191
62 usable
10.10.0.192/26
10.10.0.192 - 10.10.0.255
62 usable
Planning reminder
Validate provider-specific reservations, routing tables, firewall rules, and IPAM ownership before changing production networks.