/usr/bin/radlast is in freeradius-utils 2.1.12+dfsg-1.2ubuntu8.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #! /bin/sh
prefix=/usr
localstatedir=/var
logdir=/var/log/freeradius
exec last -f $logdir/radwtmp "$@"
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