VibeIT Tool - Network Calculator
SubnetBuddy
Subnet math with zero signal required.
Offline CIDR calculator, mask converter, VLAN planner, and IP visualizer. Results appear as you type. Built for CCNA/Network+ prep and real on-site subnet math. No internet, no account, no ads.
Built and published by VibeCMD / Explore all apps
- Offline CIDR & subnet calculator
- Subnet mask converter
- VLAN planner
- IP range visualizer
- Results as you type - no calculate button
- Built for cert prep and real on-site work
Download and support
Choose your platform.
Available on the App Store and Google Play. Check your store for current compatibility, purchase options, and release notes.
Need help with SubnetBuddy?
Tell us the app name, device, and what happened. Please do not send passwords or sensitive account information.
Contact VibeCMD app supportBefore you download
Quick answers.
Does SubnetBuddy need an internet connection?
Never. CIDR math, mask conversion, VLAN planning, and IP visualization all compute on-device, with results appearing as you type.
Is it good for CCNA or Network+ prep?
That is half of why it was built. The other half is real subnet math on site, where there is no signal and no time for a web calculator.
Is it on iOS and Android?
Both - SubNetBuddy is on the App Store and Google Play with the same offline-first behavior.
Do I need an account?
No account, no sign-up, no ads. Open the app and start typing an IP address.
Something of your own?
Let's build your idea.
If you need an app for your own business or community, explore custom development and tell me what you have in mind.