About 3GPP Decoder

What is 3GPP Decoder?

3GPP Decoder is the world's best online tool for decoding and encoding 3GPP protocol messages. It supports all major protocols used in 4G LTE and 5G NR networks, including S1AP, NGAP, X2AP, RRC, NAS, and GTP.

Our mission is to provide telecom engineers, network operators, and developers with a fast, reliable, and user-friendly tool for analyzing 3GPP protocol messages. All decoding and encoding happens in your browser, ensuring privacy and performance.

Supported Protocols

S1AP

S1 Application Protocol for eNodeB-MME communication in LTE networks

NGAP

NG Application Protocol for gNodeB-AMF communication in 5G networks

X2AP

X2 Application Protocol for eNodeB-eNodeB communication

RRC

Radio Resource Control protocol for UE-network communication

NAS

Non-Access Stratum protocol for UE-core network communication

GTP

GPRS Tunneling Protocol for user data and signaling

Features

  • ASN.1 PER Decoding

    Full support for ASN.1 Packed Encoding Rules used in 3GPP protocols

  • Real-time Processing

    All decoding happens in your browser for instant results

  • 4G & 5G Support

    Complete coverage of LTE and NR protocols

  • Privacy First

    No data is sent to servers - everything stays in your browser

Technical Details

Frontend Framework

Astro - Static site generation with island architecture for interactivity

Styling

Tailwind CSS - Modern utility-first CSS framework

Deployment

Cloudflare Pages - Global CDN for fast performance

Code Quality

TypeScript - Type-safe development with comprehensive type definitions