ASN.1 encoded message data are used in a lot of transmission protocols, e.g. SNMP. The decontev ASN.1 Decoder tool can be used for decoding of ASN.1 BER (Basic Encoding Rules) encoded binary data.


The application provides two decoder modes
 – data stream mode
 – value mode
The decoding results are represented in XML structures and will be displayed in a comfortable tree view. In the result window, the input data grid values and the tree view values are mutually synchronized and highlighted.
The ASN.1 tag type,  tag length and  field value are highlighted separately by different colors.
In the ‘value mode’ single ASN.1 BER coded values such as object IDs etc. can be converted.

System Requirements

  Windows 7, 8, 8.1, 10


  free to use

ASN.1 Decoder - Basic Encoding Rules (BER)
ASN.1 Decoder - Main Window
ASN.1 Decoder - Decoder Result
ASN.1 Decoder - Decoder Result


For testing the tool copy the ASN.1 encoded message into the ‘Data Stream’ tab and click the ‘Decode’ button.


					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