/24
/0 /8 /16 /24 /32
Network Address -
Broadcast Address -
Subnet Mask -
Total Hosts -
IP Class -
Host Range -

Binary Representation

Address
Submask

Calculate IP Subnets | Instant Network Ranges & Host Counts 🌐

Quickly determine CIDR notation, subnet masks, broadcast addresses, and usable IP ranges. This tool streamlines network configuration for engineers and system administrators.

💡 About This Tool

Setting up a router or configuring a VPC? Manual subnetting is prone to typos and configuration errors. This tool simplifies your workflow:

  • Eliminate Math Errors: Skip the manual binary conversions and bitwise math. Get instant, accurate results.
  • Visualize Your Mask: See exactly how your subnet mask segments your IP address with the built-in binary visualizer.
  • Generate IP Inventories: Export a complete list of IP addresses within a range for firewall rules or documentation.

📘 Pro Tips

  • Slide to Resize: Use the real-time CIDR slider to adjust your mask from /0 to /32 and watch the host range update instantly.
  • Master Binary: Compare IPs and masks in bits—an essential feature for CCNA and CompTIA Network+ candidates.
  • Identify Network Classes: Automatically detect if your IP belongs to Class A, B, C, D, or E.
  • Export to Text: Generate a downloadable list of every IP in a block (up to a /24) with a single click.

🧐 FAQ

Does it support IPv6? This version focuses exclusively on IPv4, the standard for most internal network configurations.

Why are two addresses subtracted from the host count? In every standard subnet, the first address is the Network ID and the last is the Broadcast address. Neither can be assigned to an individual device.

Is there a limit on list generation? To maintain browser performance, we limit list generation to /24 blocks (256 addresses) or smaller. We do not recommend generating lists for /16 ranges or larger.

📚 Trivia

  • What is CIDR?: Classless Inter-Domain Routing. Introduced in 1993, CIDR replaced the rigid "Class" system that wasted millions of addresses.
  • The Magic Number 255: Because an octet consists of 8 bits, the maximum value is 2^8 - 1, which equals 255 (11111111 in binary).
  • Private IP Ranges: 192.168.x.x, 10.x.x.x, and 172.16.x.x are reserved for private local networks and are never routed on the public internet.