Online Tool
IEC 104 Decoder
Decode IEC 60870-5-104 APDUs, APCI start bytes, I/S/U formats, and ASDU payloads with time-tagged value inspection.
Raw HEX Frame Input
Cleaned chars: 0
Bytes: 0
Live decoding enabled
No hex pasted yet. Try Sample to see the decoder in action.
About this tool
Decode raw hex captures (Wireshark, serial sniffer, SCADA gateway logs) field by field — no sign-up, no uploads, everything runs in your browser. Supported input formats:
- Spaces, commas, colons, newlines,
0xprefixes, mixed case hex. - Single frame or concatenated frames; the first complete frame is decoded.
- Click Sample for a realistic frame typical of this protocol.
- All parsing is local (no network calls, no telemetry).