Why Choose This Subnet Calculator
This single-page tool delivers everything you need to plan IPv4 networks: network and broadcast addresses, host ranges, subnet and wildcard masks, binary representations, and IP class designations—updated in real time while you type.
- Instantly see network address, broadcast address, usable host counts, and total address capacity.
- Convert between CIDR prefixes, dotted-decimal subnet masks, wildcard masks, and binary output without extra clicks.
- Spot private, public, multicast, loopback, and link-local designations to avoid misconfigured address plans.
How to Use the IPv4 Subnet Calculator
- Enter any valid IPv4 address in the highlighted field or start from the defaults.
- Adjust the CIDR prefix with the number field or slider to size the address space.
- Review the calculated results panel to confirm host ranges, masks, and address classification before provisioning.
IPv4 Subnetting FAQ
What address information does this calculator provide?
The results include CIDR notation, network and broadcast addresses, first and last usable hosts, total and usable host counts, subnet and wildcard masks, plus binary views for quick troubleshooting.
Can I plan private networks such as VPCs or VLANs?
Yes. The calculator highlights when an IPv4 address belongs to private ranges like 10.0.0.0/8, 172.16.0.0/12, or 192.168.0.0/16 so you can safely assign space to VPCs, VLANs, or lab environments.
Does anything leave the browser when calculating subnets?
No data is transmitted. All subnet math runs locally in your browser, ensuring fast feedback and keeping sensitive address plans private.