/usr/sbin/ibnodes is in infiniband-diags 1.6.1-1.
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 | #!/bin/bash
IBPATH=${IBPATH:-/usr/local/sbin}
$IBPATH/ibhosts $@; $IBPATH/ibswitches $@
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