5G NAS Hex Decoder
5G NAS carries mobility and session signaling between user equipment and 5G core control functions. Header-level decoding helps troubleshoot registration, authentication, and session setup procedures.
Decoder: 5G NAS
Decode 5G NAS Data
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Raw Decode Output
Decoded Fields
Payload Hex: N/A
Payload ASCII: N/A
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About 5G NAS
5G NAS is a control-plane protocol between UE and core network functions for mobility and session procedures. Early bytes identify whether the message is 5GMM or 5GSM and how NAS security is applied.
5G NAS carries mobility and session signaling between user equipment and 5G core control functions. Header-level decoding helps troubleshoot registration, authentication, and session setup procedures.
5G NAS Header Structure
- Extended Protocol Discriminator (1 byte): identifies 5GMM or 5GSM domain.
- Security Header Type (upper nibble): plain, integrity-protected, or ciphered NAS context.
- Message Type (1 byte): specific NAS procedure (for example registration or authentication flow messages).
Why Decode 5G NAS Packets
Decode 5G NAS header fields from hex including protocol discriminator, security header type, and message type.