IP Subnet Calculator
Calculate network masks, subnets, host ranges, and broadcast addresses with our IP Subnet Calculator.
Quick Templates
Saved Favorites
Subnet Cheat Sheet
| CIDR | Subnet Mask | Wildcard | Hosts | Networks |
|---|---|---|---|---|
| /8 | 255.0.0.0 | 0.255.255.255 | 16,777,214 | 256 Class C |
| /16 | 255.255.0.0 | 0.0.255.255 | 65,534 | 256 Class C |
| /24 | 255.255.255.0 | 0.0.0.255 | 254 | 1 Class C |
| /25 | 255.255.255.128 | 0.0.0.127 | 126 | 2 subnets |
| /26 | 255.255.255.192 | 0.0.0.63 | 62 | 4 subnets |
| /27 | 255.255.255.224 | 0.0.0.31 | 30 | 8 subnets |
| /28 | 255.255.255.240 | 0.0.0.15 | 14 | 16 subnets |
| /29 | 255.255.255.248 | 0.0.0.7 | 6 | 32 subnets |
| /30 | 255.255.255.252 | 0.0.0.3 | 2 | 64 subnets |
| /31 | 255.255.255.254 | 0.0.0.1 | 2 (P2P) | 128 subnets |
| /32 | 255.255.255.255 | 0.0.0.0 | 1 (Host) | 256 subnets |
Was this result helpful?
Thank you for your feedback!
Your input helps us improve our tools.
Add more details about your experience
Help us fix issues with this tool
- 1 Input IP Address: Enter a base IP address (e.g., `192.168.1.1`).
- 2 Input CIDR/Mask: Enter either the CIDR notation (e.g., `/24`) or the subnet mask (e.g., `255.255.255.0`).
- 3 Calculate: Click "Calculate Subnet".
- 4 View Results: Instantly receive the Network ID, Broadcast Address, first and last usable host IP, and the total number of hosts.
What is subnetting used for?
Subnetting is used to divide a large network into smaller, more efficient, and more manageable subnetworks, improving organization and security.
What does the CIDR notation mean?
CIDR (Classless Inter-Domain Routing) notation (e.g., `/24`) is a shorthand that specifies the number of bits in the network portion of the address.
What is the Broadcast Address?
The Broadcast Address is the last address in the subnet range, used to send data to all hosts simultaneously within that specific subnet.
Network Planning
Example Keyword: calculate IP range for /27
Determine the size and range of a new subnet for department or device segmentation.
Host Range Verification
Example Keyword: find usable host IPs
Quickly confirm the first and last valid IP addresses available for device assignment within a subnet.
CIDR Conversion
Example Keyword: convert subnet mask to CIDR
Easily translate between the CIDR format and the standard subnet mask notation for configuration.
Related Tools
Discover more tools that work perfectly with IP Subnet Calculator