Developer Tools
CIDR / Subnet Calculator
CIDR / Subnet Calculator is a free browser-based developer tools for quick everyday work. Use it without registration, with instructions, examples, FAQ, and related tools on the same page.
Tool action area
The tool interface below is currently shown in Traditional Chinese. The page guidance and SEO content are available in English.
Subnet 結果
ip
192.168.1.10
prefix
24
subnetMask
255.255.255.0
wildcardMask
0.0.0.255
network
192.168.1.0
broadcast
192.168.1.255
firstUsable
192.168.1.1
lastUsable
192.168.1.254
totalAddresses
256
usableHosts
254
第一版支援 IPv4 CIDR；IPv6、VLSM 與多網段切分可後續再擴充。
How to Use
Enter or paste the content for CIDR / Subnet Calculator.
Run the browser-side conversion, validation, or calculation.
Review the result and copy it when needed.
Common Uses
- Handle a quick CIDR / Subnet Calculator task without signing in.
- Prepare data for development, documents, or daily work.
- Check results locally before sharing or publishing.
FAQ
Do I need to sign in to use this tool?
No. Day Toolbox tools are available directly in the browser without registration or login.
Is my input uploaded to a server?
No. Ready tools are designed to run in your browser and do not send the content to a custom backend.
What can I use CIDR / Subnet Calculator for?
CIDR / Subnet Calculator is useful for quick browser-side tasks where you want a clear result without creating an account or sending data to a custom backend.