ICMP Hex Decoder

ICMP carries network control and diagnostic messages such as Echo Request/Reply and error reports, making it central to troubleshooting tools like ping and traceroute.

Decode ICMP 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 ICMP

ICMP carries control and diagnostic signaling for IP networks. Different type/code combinations represent echo tests, destination errors, redirects, and other network feedback.

ICMP carries network control and diagnostic messages such as Echo Request/Reply and error reports, making it central to troubleshooting tools like ping and traceroute.

ICMP Header Structure

Type (1 byte): high-level ICMP message category.
Code (1 byte): subtype within the selected message type.
Checksum (2 bytes): header and payload integrity value.
Rest of Header (4 bytes): type-specific control information.

Why Decode ICMP Packets

Decode ICMP packet fields from hex including message type, code, checksum, and body.