IP Subnet Calculator — CIDR, Host Count & Binary Breakdown
What subnet settings does your network need?
Enter any IP address in CIDR notation (e.g., 192.168.1.0/24) to instantly compute the network address, broadcast address, subnet mask, usable host range, and total host count — plus a full binary breakdown and prefix size comparison table. Subnetting is one of the most common tasks in network administration, but the math is tedious by hand. This calculator eliminates that entirely: enter the network and prefix length, get all derived values in seconds. The binary view shows exactly which bits are in the network portion versus the host portion — essential for understanding how CIDR notation works at the bit level. The prefix comparison table shows common subnet sizes side by side so you can quickly choose the right one for your use case. Whether you are designing a home lab, partitioning a corporate network, or studying for CompTIA Network+ or CCNA, this tool eliminates repetitive subnet arithmetic so you can focus on design decisions.
- →Planning a network deployment and calculating how many hosts fit in a given subnet
- →Verifying network address, broadcast address, and usable host range for a CIDR block
- →Learning subnetting for CompTIA Network+, CCNA, or other networking certifications
- →Troubleshooting network connectivity by confirming two IPs are in the same subnet
- →Choosing the right CIDR prefix size for a cloud VPC or office network
An IT admin is setting up a small office with 60 workstations. A /25 subnet provides 126 usable host addresses — enough room to grow. She enters 192.168.10.0/25: network address 192.168.10.0, broadcast 192.168.10.127, usable range .1 through .126. She assigns the router .1, sets DHCP from .50 to .126, and reserves .2–.49 for static devices like printers and servers, completing the network plan in minutes.
IPv4 Subnet Calculator — Instant Results
Calculate subnet mask, host range, broadcast address, wildcard mask, binary breakdown, and visual charts for any IPv4 CIDR. Results update live as you type.
Common Presets
Subnet Configuration
Results are for informational purposes only.
Related Calculators
Binary Calculator
What is the binary or hex value?
Contact Info Extractor
Extract emails, names, phones, companies, and addresses from any text at once.
SEO Analyzer
Is this page optimized well enough to rank? Get a full SEO audit in seconds.
URL Extractor
Extract, deduplicate, and analyze every URL from any text or HTML instantly.
Phone Number Extractor
Extract, normalize, and deduplicate every phone number from any text instantly.
Email Verifier & Validator
Validate and score every email address — single or bulk — before you send.
Email Extractor
Extract, deduplicate, and validate every email address from any text instantly.
Password Generator
How strong should your password be?
Related Tools
Password Generator
How strong should your password be?
Email Extractor
Extract, deduplicate, and validate every email address from any text instantly.
Phone Number Extractor
Extract, normalize, and deduplicate every phone number from any text instantly.
URL Extractor
Extract, deduplicate, and analyze every URL from any text or HTML instantly.
Email Verifier & Validator
Validate and score every email address — single or bulk — before you send.
Contact Info Extractor
Extract emails, names, phones, companies, and addresses from any text at once.