QUIC Hex Decoder

QUIC runs over UDP and carries encrypted transport packets for HTTP/3 and modern application traffic. Header decoding helps classify long/short headers and connection identifier structure.

Decode QUIC Data

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Raw Decode Output

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Decoded Fields

Payload Hex: N/A

Payload ASCII: N/A

Additional Insights

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About QUIC

QUIC packets use either long or short headers. Long headers expose version and source/destination connection ID lengths, while short headers expose compact routing and packet-number-length hints.

QUIC runs over UDP and carries encrypted transport packets for HTTP/3 and modern application traffic. Header decoding helps classify long/short headers and connection identifier structure.

QUIC Header Structure

Header Form bit: long header (1) or short header (0).
Fixed Bit: should be set to 1 in valid QUIC packets.
Long header fields: Version, Destination CID Length/Value, Source CID Length/Value, and packet type bits.
Short header fields: spin/key-phase bits and packet number length indicator.

Why Decode QUIC Packets

Decode QUIC header fields from hex including header form, fixed bit, version, packet type, and connection ID lengths.