IP Subnet Calculator
Calculate network, broadcast, host range and mask for any IPv4 CIDR block.
- Network address
- —
- Broadcast address
- —
- First usable host
- —
- Last usable host
- —
- Usable hosts
- —
- Subnet mask
- —
- Wildcard mask
- —
- Address range
- —
How to use the IP Subnet Calculator
-
Enter an IP and CIDR (e.g. /24).
-
Read the calculated ranges.
-
Copy the values you need.
What is a subnet calculator?
Subnetting splits an IP network into smaller blocks. Given an IPv4 address and CIDR prefix (like 192.168.1.0/24), this calculator works out the network and broadcast addresses, usable host range, subnet mask, wildcard mask and total hosts — essential for network configuration.
Key features
- Network & broadcast addresses
- Usable host range & count
- Subnet & wildcard masks
- Instant CIDR parsing
Frequently asked questions
What does /24 mean?
The /24 prefix means the first 24 bits are the network portion, leaving 256 addresses (254 usable hosts).
Why are usable hosts two fewer than total?
The network and broadcast addresses are reserved, so they aren't assignable to hosts.
Does it support IPv6?
This calculator focuses on IPv4 CIDR; IPv6 support is planned.