Packet AnalysisLOCALRuns in your browser
ICMP Decoder
Decode ICMP type, code, checksum, rest-of-header bytes, and payload from hex.
This tool handles input and primary processing in your browser and is designed not to send the input to QuickKit’s server.
Decoded fields
Remaining payload
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How it works
Paste an ICMPv4 message beginning at Type. The Internet checksum is recomputed over all supplied bytes, so a truncated capture may show a mismatch. The type is named only for a small standards-defined set; code-dependent meanings are not guessed.