This file is indexed.

/usr/lib/libpacketdump/ip_58.protocol is in libpacketdump3 3.0.10-1build1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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be8	integer "ICMP6: Type"
be8	integer "ICMP6: Code"
be16	hex 	"ICMP6: Checksum"
next	"icmp6"	"ICMP6: Type"