ASN.1 Decoder

Decode RRC, NGAP, F1AP, E1AP, XnAP, S1AP, X2AP, LPP, NRPPa and NAS messages from hex. Embedded containers are decoded in place.

Input

Protocol

Message / type

Hex — or bits prefixed with 0b (spaces, 0x and line breaks are ignored)

…or load a file (binary, or text containing hex)Read locally — the file is not uploaded.

Decode embedded containers (NAS-PDU, RRCContainer, CellGroupConfig, UE capabilities…) Input is an SRB PDCP PDU (strip 2-byte header and 4-byte MAC-I)

Ctrl+Enter

Examples

RRC buffers come from a lab attach (CU + OAI DU) — the full flow from RRCSetupRequest to RRCReconfigurationComplete.

About

Decoding uses pycrate (LGPL-2.1, licence; one file modified) running in your browser through Pyodide. The Python runtime loads from the jsDelivr CDN on first use; your messages never leave the browser. NR RRC definitions include Rel-18 types; check the release of each protocol module if a recent IE does not decode.

Result

Paste a message and press Decode, or pick an example.

Paste a message and press Decode, or pick an example.