Analyze CIDR blocks, masks, ranges, and host counts. Check usable IPs, classes, and binary details. Make confident network plans for routing, security, and scaling.
| Input | Subnet Mask | Network | Broadcast | Usable Hosts |
|---|---|---|---|---|
| 192.168.10.34/27 | 255.255.255.224 | 192.168.10.32 | 192.168.10.63 | 30 |
| 10.0.5.18/24 | 255.255.255.0 | 10.0.5.0 | 10.0.5.255 | 254 |
| 172.16.8.140/20 | 255.255.240.0 | 172.16.0.0 | 172.16.15.255 | 4,094 |
For /31 networks, point-to-point links use both addresses. For /32 networks, the single address identifies one host route exactly.
This calculator converts a single IPv4 host address into a complete subnet summary that is easier to review during design, troubleshooting, audits, or documentation. It reveals the network boundary, broadcast boundary, usable host span, wildcard mask, address type, class, binary view, and decimal integer representation in one pass.
Teams often make errors when reading CIDR blocks manually, especially when several subnets must be segmented for servers, VLANs, remote offices, or firewall zones. This page reduces that risk by applying the mask directly and showing exact results immediately above the form after submission.
Because exports are included, you can save results for implementation notes, handoff documents, or change requests. The example table also offers quick validation points, making the page practical for students, administrators, consultants, and engineers handling IPv4 allocation work.
It identifies the network address, broadcast address, usable host range, subnet mask, wildcard mask, and host capacity from an IPv4 address and prefix or subnet mask.
CIDR uses a compact suffix like /24. Subnet mask input uses dotted decimal notation like 255.255.255.0. Both describe the same network boundary.
Most IPv4 subnets reserve the first address as the network address and the last address as the broadcast address, leaving the remaining addresses for hosts.
/31 networks are commonly used for point-to-point links. In that special case, both addresses can be assigned because broadcast behavior is not used normally.
A wildcard mask is the inverse of the subnet mask. It is often used in routing and access control configurations to match address ranges.
Yes. It checks whether the address belongs to private IPv4 ranges such as 10.0.0.0/8, 172.16.0.0/12, or 192.168.0.0/16.
No. This version is focused on IPv4 range planning and subnet interpretation. IPv6 addressing uses different notation, scale, and planning logic.
Export results when documenting network changes, validating subnet plans, sharing implementation details, or keeping audit records for future troubleshooting and reviews.