Developer Utilities
CIDR / IP Subnet Calculator
Standard subnet arithmetic — network address, broadcast address, mask and usable host range — from an IP and prefix length.
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- Network address
- 192.168.1.0
- Broadcast address
- 192.168.1.255
- Subnet mask
- 255.255.255.0
- First usable host
- 192.168.1.1
- Last usable host
- 192.168.1.254
- Usable hosts
- 254
How it works
- 1Enter an IPv4 address
- 2Enter a CIDR prefix length
- 3See the full subnet breakdown
Who this is for
- Planning IP address allocation for a VPC
- Verifying a subnet's usable host count before provisioning
- Understanding an existing network's addressing scheme
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