Calculator
Check IPv4 subnet boundaries, usable host ranges, wildcard masks, and network details without working through subnet math by hand.
Common starting points
Competitor tools usually win by making common subnet sizes fast to test. Start from a realistic network and then refine the prefix.
Enter any host IP inside the subnet you want to inspect.
Use the slider or the numeric field to test subnet size quickly.
Network class
Class C
Total addresses
256
Usable hosts
254
Network address
192.168.1.0
Broadcast address
192.168.1.255
Subnet mask
255.255.255.0
Wildcard mask
0.0.0.255
First usable host
192.168.1.1
Last usable host
192.168.1.254
Binary mask view
Competitor tools often surface the binary mask because it helps learners understand how the prefix actually carves the network and host bits apart.
Binary network view
Use this to verify the network boundary visually when you are debugging ranges, planning ACLs, or checking whether two addresses belong to the same subnet.
How to Use This IPv4 Subnet Calculator
Use the calculator when you need to quickly understand how an IPv4 subnet behaves, how many hosts it supports, and where its network boundaries begin and end.
Enter the IPv4 address
Start with the host address or subnet address you want to inspect so the calculator has the base network location to analyze.
Choose the CIDR prefix
Set the subnet size using the prefix length so the tool can derive the subnet mask, network boundary, and broadcast address.
Review the calculated network details
Check the network address, broadcast address, usable host range, and host capacity before applying the subnet to infrastructure.
Use the output in your network plan
Move the subnet details into cloud VPC planning, DHCP scopes, firewall rules, lab diagrams, or routing documentation.
When This Tool Is Most Useful
Subnet math shows up everywhere in infrastructure work. This calculator is most helpful when you want fast answers about address space, network boundaries, and host capacity without manually converting masks or counting ranges.
Cloud VPC and subnet planning
Break larger CIDR blocks into practical subnets for public tiers, private services, databases, and internal workloads without overlap.
DHCP and host allocation
Confirm usable host capacity before assigning address ranges to offices, VLANs, lab environments, or container networks.
Routing and firewall review
Verify whether an address belongs to a specific network and double-check the boundaries that static routes or firewall rules should cover.
Troubleshooting network issues
Inspect broadcast ranges, subnet masks, and host spans when a machine cannot reach the expected services or a segment is misconfigured.
FAQs
What does the calculator show for each subnet?
It calculates the subnet mask, network address, broadcast address, usable host range, and the number of usable IP addresses for the prefix you choose.Why is the broadcast address important?
The broadcast address marks the upper boundary of the subnet and cannot be assigned to a normal host in standard IPv4 subnetting.Does this tool work for cloud networking?
Yes. It is useful for AWS, Azure, GCP, on-prem routing, VLAN planning, and any workflow where you need to reason about IPv4 CIDR boundaries.Can I use this to estimate host capacity?
Yes. The calculator helps you understand how many usable addresses a subnet provides so you can avoid choosing ranges that are too small or unnecessarily large.