SCADA Protocol Tools
Five battle-tested online decoders. No installation, no sign-up. Paste a hex dump, get a clean human-readable breakdown for the most common SCADA protocols — right in your browser.
DNP3 Frame Decoder
Paste raw DNP3 hex frames and decode link-layer headers, transport, function codes, and CRCs with human-readable breakdowns.
Modbus Frame Decoder / Encoder
Decode or build Modbus RTU/TCP frames: function codes, registers, coils, MBAP header, and CRC/LRC validation online.
IEC 101 Decoder Tool
Interpret IEC 60870-5-101 serial frames: link addresses, control fields, function codes, and ASDU type IDs with causes.
IEC 104 Decoder
Decode IEC 60870-5-104 APDUs, APCI start bytes, I/S/U formats, and ASDU payloads with time-tagged value inspection.
IEC 103 Protocol Decoder
Parse IEC 60870-5-103 protection equipment frames: ASDU 1–10, generic services, disturbance data, and type-specific events.
How to use the decoders
Copy the raw hex string from Wireshark, your RTU log, or a serial capture. Paste it into the tool and press Decode. The tool will extract link-layer headers, ASDU fields, and CRCs.