Perform everyday calculations instantly with our sleek, easy-to-use online calculator — designed for speed, accuracy, and simplicity.
TechlyTools.com offers a wide range of free digital utilities and calculators to simplify your daily tasks. Whether it’s budgeting, math homework, or quick conversions, our tools are crafted for precision and convenience.
Enter an IP Address and Subnet Mask to calculate network details.
In the world of networking, efficiency and control are everything. Whether you’re an IT professional, a system administrator, or a networking student, subnetting is an essential skill. But manually calculating subnet ranges, usable IPs, and CIDR notations can be time-consuming and error-prone.
That’s where an IP Subnet Calculator becomes indispensable—it does the math for you and helps design scalable, secure, and organized networks in seconds.
An IP Subnet Calculator is a tool that breaks down IP address ranges into subnets based on input parameters such as:
IP address (IPv4 or IPv6)
Subnet mask
Number of hosts
CIDR notation
It instantly provides information like:
Subnet address
Broadcast address
First and last usable IP addresses
Total number of subnets and hosts
✅ A must-have tool for anyone dealing with IP planning, router configurations, or security segmentation.
IP addresses are binary numbers separated into network and host parts. Subnetting divides one large network into smaller, more manageable pieces.
For example:
IP Address: 192.168.1.0
Subnet Mask: 255.255.255.0 (or /24)
Total Usable Hosts: 254
Using subnetting, you can divide this /24 network into smaller /26 networks with 64 total addresses each (62 usable).
IP Address (e.g., 10.0.0.0)
Subnet Mask (e.g., 255.255.255.0)
Prefix/CIDR (e.g., /24)
Number of desired hosts or subnets
Network address
Wildcard mask
Broadcast address
Number of usable hosts
IP class (A, B, C)
Hexadecimal and binary representations
Design enterprise networks efficiently and predictably.
Assign customer IP ranges while maximizing IP utilization.
Learn and teach CIDR, subnetting, and IP calculations quickly.
| Class | Default Subnet | CIDR | Usable Hosts |
|---|---|---|---|
| A | 255.0.0.0 | /8 | 16,777,214 |
| B | 255.255.0.0 | /16 | 65,534 |
| C | 255.255.255.0 | /24 | 254 |
💡 Speed: Instantly generates subnet data
🔒 Accuracy: Reduces human error
⚙️ Customization: Flexible based on CIDR, mask, or host count
📊 Clarity: Outputs in decimal, binary, and hexadecimal formats
Always leave room for growth (don’t create subnets too tight)
Avoid reusing subnets across environments (especially in cloud setups)
Use naming conventions to label your subnet purposes (e.g., DMZ, Core, Guest)
Subnetting is fundamental to network architecture, and an IP Subnet Calculator is the simplest way to do it right. Whether you’re designing new infrastructure or auditing existing systems, this tool offers precision, speed, and reliability.
It’s not just for experts—anyone dealing with IPs can benefit from this.