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How to read a hexdump byte by byte in bash or awk?

This is the hexadecimal output of an IPv6 TCP packet captured with tcpdump: 6000 0000 0018 0620 0000 0000 0000 0000 0000 0000 0000 0001 0000 0000 0000 0000 0000 0000 0000 0002 *0026 0026 0000 ...