IPv4 Subnet Calculator
Visualize your network. Calculate network addresses, broadcasts, CIDR masks, and usable host ranges instantly.
Network Properties
IP Class
Class C
Private
CIDR Notation
/24
Subnet Mask
255.255.255.0
Wildcard Mask
0.0.0.255
Calculation Results
Network Address
192.168.1.0
Broadcast Address
192.168.1.255
First Usable Host
192.168.1.1
Last Usable Host
192.168.1.254
Total Usable Hosts
254
All IP Ranges
* Showing usable IP range
What is Subnetting?
Subnetting is the practice of dividing a network into two or more smaller networks. It increases routing efficiency, enhances page security, and reduces broadcast domain size. Network administrators use subnetting to break large networks into manageable parts (subnets).
Understanding CIDR Notation
CIDR (Classless Inter-Domain Routing) is a method for allocating IP addresses and for IP routing. It replaces the older classful network design.
| CIDR | Subnet Mask | Total IPs | Usable Hosts |
|---|---|---|---|
| /32 | 255.255.255.255 | 1 | 1 (Host) |
| /30 | 255.255.255.252 | 4 | 2 |
| /29 | 255.255.255.248 | 8 | 6 |
| /28 | 255.255.255.240 | 16 | 14 |
| /24 | 255.255.255.0 | 256 | 254 (Standard LAN) |
| /16 | 255.255.0.0 | 65,536 | 65,534 |
| /8 | 255.0.0.0 | 16M+ | 16M+ |
Private IP Ranges (RFC 1918)
These IP addresses are reserved for private networks (Home and Office) and are not routable on the public internet:
10.0.0.0 - 10.255.255.255(Class A)172.16.0.0 - 172.31.255.255(Class B)192.168.0.0 - 192.168.255.255(Class C)
IP Address Classes
- Class A (1-126): Supports 16 million hosts. Used by huge organizations.
- Class B (128-191): Supports 65,000 hosts. Used by medium-sized networks.
- Class C (192-223): Supports 254 hosts. Commonly used for small businesses and home LANs.
- Class D (224-239): Reserved for Multicasting.
- Class E (240-254): Reserved for Experimental/R&D purposes.