This file is indexed.

/etc/iproute2/rt_scopes is in iproute2 4.9.0-1+deb9u1.

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

The actual contents of the file can be viewed below.

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#
# reserved values
#
0	global
255	nowhere
254	host
253	link
#
# pseudo-reserved
#
200	site