Pro Calculators and Guides
How to Calculate IPv4 Subnet Masks, CIDR Ranges & Usable Hosts Online
Calculate network address, broadcast IP, usable host range, wildcard mask, and 32-bit colored binary mask from any IPv4 address and CIDR prefix.
Saizul Amin17 Oct 2026 · 1 min read
Configuring virtual private clouds (AWS VPC, Google Cloud, Azure), Docker bridge networks, and enterprise firewalls requires calculating IP subnetting and CIDR block boundaries.
The CIDR Calculator on ShobFree provides comprehensive subnet parsing with a colored 32-bit binary bit visualizer.
Quick answer
Visit shobfree.com/cidr-calculator, enter an IPv4 address (e.g., 192.168.1.0) and choose a CIDR prefix (/24), or pick presets like Home LAN or AWS Default, to get usable host capacity and binary bit breakdowns.
What ShobFree CIDR Calculator computes
- Network Address & Broadcast Address: Exact subnet boundary IPs.
- Usable Host Range: First usable IP to last usable IP.
- Total & Usable Host Count: For
/24, total is 256 and usable is 254 (network and broadcast reserved). - Subnet Mask & Wildcard Mask: Standard dotted decimal masks (e.g. 255.255.255.0 and 0.0.0.255).
- 32-Bit Binary Visualizer: Network prefix bits highlighted in emerald green and host bits highlighted in coral red.
Next step
Calculate networking boundaries accurately with the CIDR Calculator.
