One-click convert CIDR notation to IP address ranges with subnet mask, host count, and network details
Zero Dependencies · Works OfflineThe CIDR to IP Range Converter is a free online networking tool that instantly converts CIDR notation (e.g., 192.168.1.0/24) to IP address ranges, displaying subnet mask, network address, broadcast address, and usable host count. Supports IPv4 and IPv6 with batch processing for multiple CIDRs. Perfect for network engineers, DevOps, and developers for IP address planning and subnetting. All calculations happen locally in your browser — no data is ever uploaded to a server.
1. Enter CIDR notation in the input box, e.g., 192.168.1.0/24, one per line.
2. Click "Calculate" or use Ctrl+Enter.
3. View results: IP range, subnet mask, host count, etc.
4. Click "Copy Results" or download as CSV file.
Network engineers quickly calculate subnet ranges and available hosts during IP address planning.
DevOps convert CIDR to specific IP ranges when configuring firewall rules.
Verify CIDR ranges when configuring VPCs and subnets on AWS, Azure, and other cloud platforms.
CIDR (Classless Inter-Domain Routing) was introduced in 1993, replacing traditional Class A/B/C network classification. CIDR uses Variable Length Subnet Masks (VLSM), formatted as IP/prefix length. The prefix length indicates the number of network bits — e.g., /24 means 24 network bits and 8 host bits. Usable hosts = 2^(32-prefix) - 2 (subtracting network and broadcast addresses), though /31 networks (point-to-point links) have 2 usable addresses and /32 has 1. RFC 4632 defines CIDR usage specifications in detail.
A method for IP address allocation formatted as IP/prefix length, e.g., 192.168.1.0/24 means the first 24 bits are the network portion.
Yes. The tool supports both IPv4 and IPv6 CIDR notation.
Usable hosts = 2^(32-prefix) - 2, with special rules for /31 and /32.
No. All calculations happen locally in your browser.
Yes. Enter multiple CIDRs, one per line.