Network · Layer 2 / 3 / 4

Packet Decoder

Paste hex from tcpdump -xx, hexdump -C, or Wireshark "Copy as Hex Stream" — get a layer-by-layer breakdown of every byte. Decodes Ethernet, 802.1Q, IPv4/IPv6, TCP, UDP, ICMP, ICMPv6, and ARP.

→ IPv4 Subnet Calculator → IPv6 Subnet Calculator → MAC / OUI Lookup → Common Ports

Hex packet bytes

Tip: sudo tcpdump -xx -c 1 -n 'host 1.1.1.1' | sed -n '/^[ ]/p' grabs one packet.

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Bytes (color-coded by layer)

Reference

Privacy: all decoding runs in your browser. Nothing leaves the page — no API calls, no logging. Paste production captures freely.