IPv4 Subnet Calculator
1. Enter IP & Subnet
Load Sample
2. Calculated Details
IP Address–
Network Address–
Usable Host Range–
Broadcast Address–
Subnet Mask–
Wildcard Mask–
Total Hosts–
Usable Hosts–
CIDR Notation–
How to Use the IPv4 Subnet Calculator
- Enter a valid IPv4 address.
- Select the desired subnet mask or CIDR prefix.
- Click the calculate button to see network details.
Formulas and Technical Logic
Subnetting uses bitwise operations on 32-bit IP addresses. The Network Address is calculated by performing a logical AND between the IP address and the Subnet Mask. The Broadcast Address is calculated by performing a logical OR between the Network Address and the inverted Subnet Mask. Host Capacity is calculated as 2^(32-prefix) – 2.
Key Features
- Instant calculation of network and broadcast addresses.
- Usable host range identification.
- CIDR to subnet mask conversion.
- Identification of IP class and private/public status.
Reference Table: Common Subnets
| CIDR | Subnet Mask | Usable Hosts |
|---|---|---|
| /24 | 255.255.255.0 | 254 |
| /25 | 255.255.255.128 | 126 |
| /26 | 255.255.255.192 | 62 |
| /27 | 255.255.255.224 | 30 |
| /28 | 255.255.255.240 | 14 |
| /29 | 255.255.255.248 | 6 |
| /30 | 255.255.255.252 | 2 |
Frequently Asked Questions
What is a subnet mask?
A subnet mask separates an IP address into the network and host portions.
Why subtract 2 from total hosts?
The first address is reserved for the network identifier. The last address is reserved for the broadcast address.