Subnet & CIDR IP Calculator
Calculate IPv4 network boundaries, broadcast IDs, subnet masks, wildcard masks, and usable host capacity from standard CIDR notation (/24, /16).
IPv4 Subnet & CIDR Mask Calculation
Classless Inter-Domain Routing (CIDR) allocates IP addresses by specifying the prefix length (e.g. 192.168.1.0/24), allowing granular network segmentation for VPCs, routers, and firewalls.
This tool performs real-time bitwise operations to compute the exact network address, broadcast IP, and first/last usable host addresses without sending network telemetry to any server.
How to Use Subnet & CIDR IP Calculator (Step-by-Step)
Enter an IPv4 IP address and choose your CIDR prefix length (e.g., /24).
Review the calculated subnet mask, wildcard mask, network ID, and broadcast address.
View the first usable IP, last usable IP, and total assignable host count.
Applications
Common Use Cases
- Plan IP address allocations for cloud VPCs (AWS, GCP, Azure) and local networks.
- Determine usable IP address ranges and total available hosts for a given subnet mask.
- Troubleshoot network routing and firewall CIDR block rules.
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Your data never leaves your device and cannot be viewed, stored, or harvested by anyone.
Subnet & CIDR IP Calculator: Host Ranges, Subnet Masks & Wildcards
A networking guide to Classless Inter-Domain Routing (CIDR) and IP subnetting. Calculate usable host ranges, binary subnet masks, and broadcast IPs.
FAQ
Frequently Asked Questions
Why does a /24 subnet have 254 usable hosts instead of 256?
In IPv4 networking, the first address is reserved as the Network ID and the last address is reserved as the Broadcast address.