OctetLab: Subnet Calculator
VLSM planner, IPv6, offline
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
OctetLab is a subnet calculator built for network engineers, sysadmins, and students who need answers in seconds, not spreadsheets. Enter an IPv4 or IPv6 address and instantly see the network address, broadcast address, usable host range, and subnet mask — broken down bit by bit in a visualizer you can tap to reshape the mask boundary by hand.
Every calculation runs fully on-device: no accounts, no network calls, no ads.
INCLUDED
• Instant IPv4 subnet calculator with a tap-to-toggle binary bit visualizer — see and shape the mask boundary directly
• Full IPv6 subnet support, including compressed and expanded address forms
• Copy any result field or share a full subnet summary in one tap
• Save your recent calculations to a running history
PRO (ONE-TIME UNLOCK)
• VLSM subnet splitter — divide a network into right-sized subnets by host count
• Unlimited saved calculation history
• Export subnet plans to CSV
OctetLab does one job well: turning subnetting math into a clean, tappable interface — no lookup tables, no guesswork.
Terms of Use (EULA): https://obelisk.club/subnetmaskcalculator/terms
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, 永 张, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 永 张
- Size
- 926.7 KB
- Category
- Utilities
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
- English and Simplified Chinese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- SubnetMaskCalculator Pro $4.99
- Copyright
- Copyright © 2026 Peter Zhang. All rights reserved.