# OT Lexicon: Industrial Network — PLC, Profinet & Diagnostics

> PLC, Profinet & Diagnostics (iPhone/iPad app by Dominik Gausmann.)

- Source: https://appshunter.io/ios/app/ot-lexicon-industrial-network/id6812809970 (this page in markdown: same URL + `.md`)
- Developer: [Dominik Gausmann](https://appshunter.io/developer/1870320985)
- Category: Reference, Developer Tools
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 10 MB
- Languages: American English, French (France), German (Germany), Polish, European Spanish
- Released: 2026-09-20
- Data updated: 2026-10-11

## What is OT Lexicon?

OT Lexicon explains industrial networks and operational technology in a clear, practical way. Learn IP addresses, gateways, VLANs, Profinet, OPC UA, Modbus, ports, subnet masks, DNS, NTP, fiber optics and many more OT fundamentals.

Built for electricians, technicians and OT beginners, the app turns complex network terms into simple explanations, everyday comparisons, diagrams, practical plant examples and quiz questions.

Premium unlocks knowledge checks, custom company terms, plant examples, favorite notes and a practical port and protocol overview. Ideal for quick reference in the workshop, during commissioning or while troubleshooting industrial systems.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| OT Lexicon Premium | $3.99 | one-time |


## Is OT Lexicon safe?

Not enough ratings yet to assess OT Lexicon.

## Is OT Lexicon legit?

OT Lexicon: Industrial Network appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for OT Lexicon is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 3 releases)

### 1.2 — 2026-10-09

New in version 1.2:

• New premium Diagnostics & Practice section
• Clear guidance for attenuation, Rx/Tx, CRC, packet loss, latency and jitter
• Cable tester assistant for opens, shorts, reversed wires, split pairs and shielding faults
• New practical knowledge about M12 coding, Industrial Ethernet, NAT, routing and firewalls
• MRP, RSTP, PRP and HSR redundancy plus managed-switch diagnostics
• SFPs, wavelengths, link budgets, PoE classes and power planning
• EMC, shielding, equipotential bonding, network topologies and switch backups
• Illustrated T568A and T568B RJ45 wiring
• Navigation and stability improvements

### 1.1 — 2026-09-24

New in version 1.1:

• Added fiber-optic terms, single-mode, multimode, ST connectors and the DIN/IEC color sequence
• Added illustrated RJ45 pinouts for T568A and T568B
• Topic cards on the home screen now open the matching articles
• Fixed article navigation when opening the lexicon from the menu
• Improved search and custom company-term input
• Expanded the port and protocol guide, plant examples and knowledge quiz
• Improved visual clarity and contrast throughout the app

### 1.0 — 2026-09-20

No release notes.

## More apps by Dominik Gausmann

- [Würfly - Dice Score Sheet](https://appshunter.io/ios/app/wurfly-dice-score-sheet/id6758018932)
- [OT Subnet Calculator](https://appshunter.io/ios/app/ot-subnet-calculator/id6758581610)
- [Expiry - Expiration dates](https://appshunter.io/ios/app/expiry-expiration-dates/id6758586095)
- [MatchMoments](https://appshunter.io/ios/app/matchmoments/id6770105481)
- [Tap the Circle](https://appshunter.io/ios/app/tap-the-circle/id6770306077)
- [GolfTrackly](https://appshunter.io/ios/app/golftrackly/id6771446446)

All apps by Dominik Gausmann: https://appshunter.io/developer/1870320985

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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 2026-10-11.*