HAFAS Bitmask Calculator

Web Demo

This is a simple web-based tool to help you decode and encode bitmasks used by the HAFAS (HaCon Fahrplan-Auskunfts-System) API.
It visually maps a decimal bitmask to the transport modes it represents and vice versa.

🔍 What is HAFAS?

HAFAS is a timetable and journey planning system widely used across European transport networks, including:

• Deutsche Bahn (DB)
• SaarVV
• Luxembourg Mobilitéit
• Many other regional operators

In HAFAS APIs, transport modes (ICE trains, buses, trams, ferries, etc.) are often encoded in a bitmask —
a single number where each bit (1, 2, 4, 8, …) represents a specific type of transport.

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✨ Features

• 🔢 Enter a number to decode it into selected transport modes
• ✅ Click transport icons to encode a bitmask value
• 🔄 Switch between different mode sets (DB, SaarVV, Luxembourg, HAFAS client spec)
• ⚠️ Input capped to valid 11-bit range (0–2047)
• 💡 Uses the official hafas-client mode bitmask as one profile

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🛠 Technology

• React + Vite
• Plain CSS for styling
• No external UI libraries
• Fully static — can be deployed to GitHub Pages, Netlify, etc.

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Structure

directory

.
├── assets        # static scripts and assets for demo
├── index.html  # demo entry
└── react   # react source code

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Related Projects

hafas-client – JavaScript client for HAFAS public transport APIs.
Mobiliteit.lu – Real-Time tracking of bus lines across Luxembourg