Subnet Calculator
Calculates IP networks, CIDR masks, host ranges, and broadcast addresses.
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Guide & best practices
Subnet Calculator for CIDR, hosts and wildcard masks
Plan IP ranges reliably: from IP and prefix Balou derives network, broadcast, usable hosts and mask for network design and ACLs.
Typical use cases
Useful for network planning, VLAN/subnet design, firewall and ACL rules, cloud VPC layouts and quickly checking CIDR ranges.
How the subnet calculator works
Enter an IP address and CIDR prefix or mask; Balou computes the network, broadcast and host range, host count and wildcard mask locally.
Subnet planning best practices
Plan prefixes with headroom, document subnet boundaries, use /64 as the default LAN prefix for IPv6 and check for overlaps before routing.
Frequently asked questions
What does /24 (CIDR) mean?
A /24 equals the mask 255.255.255.0 with 256 addresses and 254 usable hosts (network and broadcast address excluded).
How do I compute network and broadcast address?
Example 192.168.10.37/27: network 192.168.10.32, broadcast 192.168.10.63, usable hosts 192.168.10.33–.62.
What is a wildcard mask?
The inverted subnet mask (e.g. 0.0.0.255 for /24), often used in router/firewall ACLs.
How do IPv4 and IPv6 subnets differ?
IPv6 uses much larger prefixes; /64 is the common default LAN prefix for a single segment.