Subnet Calculator
Calculate IPv4 subnet details from CIDR notation. Network address, hosts, masks, and more.
Enter a CIDR notation above to calculate
We calculate network address, subnet mask, host range, and more
Common Subnets
Ctrl+Enter to runCtrl+Shift+C to copy
Learn More
Subnet Calculator: IPv4 CIDR, Masks and Hosts Guide
Learn how subnetting works and calculate IPv4 subnet details from CIDR notation. Network address, broadcast, hosts, and masks explained.
What Is Subnetting?
Subnetting is the practice of dividing an IP network into smaller, more manageable segments called subnets. Each subnet has its own range of IP addresses, network address, and broadcast address. This is fundamental to network design, security, and efficient IP address allocation.
5 min readRead full guide