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Subnet & IP Calculator
Calculate network addresses, broadcast addresses, host ranges, and more. Analyze any IPv4 address with CIDR notation or lookup IP details.
Value: 0–32
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Frequently Asked Questions
What is a subnet mask?
A subnet mask is a 32-bit number that separates an IP address into network and host portions. It tells devices which part of the address identifies the network and which identifies a specific host on that network.
What does CIDR mean?
CIDR (Classless Inter-Domain Routing) notation writes an IP address followed by a slash and the number of network bits, e.g. 192.168.1.0/24. The /24 means the first 24 bits are the network portion.
What's the difference between total hosts and usable hosts?
Total hosts is 2^(32−CIDR). Usable hosts subtracts the network address (all host bits 0) and broadcast address (all host bits 1), except for /31 (point-to-point, 2 usable) and /32 (single host, 1 usable).
What are private IP addresses?
Private IPs (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) are reserved for internal networks and cannot be routed over the public internet. They're commonly used in home and office LANs.