IPv4 subnet calculator
Enter an IP address and a mask (or type 192.168.1.10/24) to get the network, broadcast and host range, and to split the network into smaller subnets. Everything is calculated in your browser.
Try:
- CIDR notation
- 192.168.1.0/24
- Network address
- 192.168.1.0
- Broadcast address
- 192.168.1.255
- First usable host
- 192.168.1.1
- Last usable host
- 192.168.1.254
- Usable hosts
- 254
- Subnet mask
- 255.255.255.0
- Wildcard mask
- 0.0.0.255
- IP class
- Class C
- IP type
- Private
- Integer / hex
- 3232235786 / 0xC0A8010A
256 addresses in total
Small networks (192.0.0.0 - 223.255.255.255)
Binary
- IP address
- 11000000.10101000.00000001.00001010
- Subnet mask
- 11111111.11111111.11111111.00000000
- Network
- 11000000.10101000.00000001.00000000
- Broadcast
- 11000000.10101000.00000001.11111111
Split into smaller subnets
4 subnets of 62 usable hosts each
| # | Network | Usable range | Broadcast | Hosts |
|---|---|---|---|---|
| 1 | 192.168.1.0 | 192.168.1.1 - 192.168.1.62 | 192.168.1.63 | 62 |
| 2 | 192.168.1.64 | 192.168.1.65 - 192.168.1.126 | 192.168.1.127 | 62 |
| 3 | 192.168.1.128 | 192.168.1.129 - 192.168.1.190 | 192.168.1.191 | 62 |
| 4 | 192.168.1.192 | 192.168.1.193 - 192.168.1.254 | 192.168.1.255 | 62 |
Good to know
- What is a subnet mask?
- A subnet mask marks which bits of an IPv4 address identify the network and which identify the host. 255.255.255.0 means the first 24 bits are the network, written /24 in CIDR notation.
- Why are there two fewer usable hosts than addresses?
- The first address of a subnet is the network address and the last one is the broadcast address, so neither can be given to a host. /31 (point to point links, RFC 3021) and /32 (a single host) are the exceptions.
- What is a wildcard mask?
- The wildcard mask is the inverse of the subnet mask (0.0.0.255 for /24). Router access lists and OSPF network statements use it to say which address bits may vary.