IP Subnet Calculator
Calculate IP subnet masks, network address, and host ranges.
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IP Subnet Calculator
IP Subnet Calculator
An IP subnet calculator helps network engineers and administrators divide an IP address space into smaller subnetworks. It computes the subnet mask, network address, broadcast address, and usable host range from a given IP address and prefix length (CIDR notation).
Common Uses
- Designing network segmentation for organizations
- Calculating host ranges for IP address allocation
- Troubleshooting network configuration issues
- Subnetting practice for networking certifications (CCNA, CompTIA Network+)
Frequently Asked Questions
What is a subnet mask?
A subnet mask is a 32-bit number that divides an IP address into network and host portions. Common masks: /24 (255.255.255.0) = 254 hosts, /16 (255.255.0.0) = 65,534 hosts, /8 (255.0.0.0) = 16,777,214 hosts.
What is CIDR notation?
CIDR (Classless Inter-Domain Routing) notation expresses an IP address and its subnet mask as a single value using a slash. Example: 192.168.1.0/24 means the network is 192.168.1.0 with a 24-bit mask (255.255.255.0), allowing 254 usable host addresses.
Is this calculator free to use?
Yes. All calculators on zenicalculator.com are completely free with no registration required.
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