Free online hex packet decoder tool. Analyze Ethernet, IPv4, TCP, UDP, ICMP, and ARP packets from hexadecimal data. Perfect for network debugging, security analysis, and learning network protocols.
Accepts hex with or without spaces, colons, or 0x prefix. Must be even number of characters.
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Our hex packet decoder analyzes raw network packet data and breaks it down into readable protocol layers. Whether you're debugging network issues, analyzing captures from Wireshark, or learning how network protocols work, this tool makes packet analysis simple and visual.
Network packets are transmitted as binary data, often displayed in hexadecimal format. Hex packet decoding converts this raw data into human-readable fields showing each protocol layer - from Ethernet MAC addresses to TCP port numbers and flags. This is essential for network troubleshooting and security analysis.
Packet Structure
Packet = Ethernet Header + IP Header + TCP/UDP Header + Application DataIdentify malformed packets, incorrect headers, and protocol issues causing connectivity problems.
Examine suspicious traffic, detect anomalies, and understand attack patterns in packet captures.
Visualize how TCP/IP works by seeing real packet structures with field-by-field breakdowns.
Copy hex dump from Wireshark packet bytes pane for quick field identification.
Decode network forensics challenges in security competitions and CTF events.
Verify packet structures when developing network applications or protocols.
Learn TCP/IP stack by examining real packet examples layer by layer.
The decoder supports Ethernet II frames containing IPv4 packets with TCP, UDP, or ICMP. ARP packets are also supported. IPv6 is identified but not fully decoded yet.
In Wireshark, select a packet, right-click on the hex pane and choose 'Copy as Hex Stream'. Alternatively, go to File > Export Packet Dissections > As Plain Text and copy the hex portion.
TCP flags indicate connection state: SYN initiates connections, ACK acknowledges data, FIN closes connections, RST resets, PSH pushes data immediately, URG marks urgent data.
Ensure your hex data is complete and properly formatted (only 0-9, A-F characters). The packet should start with an Ethernet frame (MAC addresses) or raw IP header. Truncated packets may fail to decode completely.