How to avoid broadcasting a hostname via WAN, or how to broadcast an invalid hostname?

On my network there are several devices (none of which are mine), which do not broadcast a hostname, and instead are labelled “Unknown Device - 4” or similar. I’m not sure if these devices are broadcasting no hostname or just one which cannot be understood by the router upstream. Is there any way I can obtain this behaviour on my AR750S?

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I’ve found a way to obtain this behaviour. In case anyone else is trying to do this the method was to set the hostname to be a space, which I achieved through the terminal commands

uci set network.wan.hostname=' '
uci commit network

and then restarting the WAN interface.