# SubnetBuddy — CIDR & Subnet Calculator

> CIDR & Subnet Calculator (iPhone/iPad app by VibeCMD LLC.)

- Source: https://appshunter.io/ios/app/subnetbuddy/id6759632592 (this page in markdown: same URL + `.md`)
- Developer: [VibeCMD LLC](https://appshunter.io/developer/1879550677)
- Category: Utilities, Education
- Price: Free
- Age rating: 4+
- Requires: iOS 15.1 · 24 MB
- Languages: American English
- Released: 2026-02-27
- Data updated: 2026-03-05
- User reviews in markdown: https://appshunter.io/ios/app/subnetbuddy/id6759632592/reviews.md

## What is SubnetBuddy?

SubnetBuddy is a fast, offline subnet calculator and network planning tool built for IT professionals, network engineers, students, and anyone studying for their CCNA, CompTIA Network+, or just needs to crunch CIDR notation on the fly.

No internet required. No ads. No account needed. Just open the app and start calculating.

SUBNET CALCULATOR
• Enter any IP address and CIDR prefix (e.g. 192.168.1.0/24)
• Instantly see network address, broadcast address, first and last usable host
• View total hosts, usable hosts, and wildcard mask
• Get the next sequential subnet with one tap
• Supports all prefix lengths from /0 to /32

MASK CONVERTER
• Convert between CIDR notation, dotted decimal, and binary
• Enter a prefix length and see all three formats instantly
• Quick-reference for common subnet masks
• Perfect for exam prep and on-the-job lookups

VLAN PLANNER
• Plan multiple VLANs with custom names and sizes
• Set a base network and SubnetBuddy calculates non-overlapping subnets for each VLAN
• See network range, gateway, CIDR, and host count per VLAN
• Great for designing office networks, lab environments, and homework assignments

IP VISUALIZER
• Enter a CIDR block and see a visual map of the IP address space
• Color-coded grid shows used vs. available addresses
• Instantly understand how big (or small) your subnet really is
• Tap any cell to see the full IP address

TERMINAL-STYLE DESIGN
• Dark theme with VibeCMD's signature hacker-green aesthetic
• Monospace fonts and command-line inspired interface
• Clean, distraction-free layout built for speed
• Easy on the eyes during late-night study sessions

WORKS COMPLETELY OFFLINE
• Zero network calls — all calculations happen on-device
• No account required — open and use immediately
• No data collection — your network plans stay on your phone
• Lightning fast — results appear as you type

BUILT FOR REAL PEOPLE
• IT professionals doing quick subnet math on-site
• Students studying for CCNA, Network+, or any networking exam
• Homelab enthusiasts planning their network segments
• DevOps engineers carving up VPC address spaces
• Anyone who's tired of Googling "what is /22 in dotted decimal"

SubnetBuddy is a utility tool for network address calculations. It does not connect to or scan any networks.


## Version history (last 2 releases)

### 1.2 — 2026-02-28

v1.2.0

• Every screen now loads with live example results — no more blank screens on launch.
• Subnet Calculator auto-recalculates as you type.
• New app icon and splash screen with refreshed dark terminal branding.
• Cleaner screen headers with more vertical space.
• Result rows now show a copy icon so you know they're tappable.
• CIDR/Mask converter highlights the active reference row.
• VLAN Planner stability improvements.

### 1.0 — 2026-02-27

No release notes.

## More apps by VibeCMD LLC

- [LinkLoop T1D](https://appshunter.io/ios/app/linkloop-t1d/id6759566762)
- [VibeStack](https://appshunter.io/ios/app/vibestack/id6759698502)
- [StrideLoop](https://appshunter.io/ios/app/strideloop/id6760045796)
- [SubHook](https://appshunter.io/ios/app/subhook/id6760349965)

All apps by VibeCMD LLC: https://appshunter.io/developer/1879550677

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-03-05.*