The best what to “block”, is with a firewall.
Not sure what your network looks like, so hard to give any direction [and this is not the forum for that anyway].
One simple way to “block” is to add “blackhole” routes on the system itself (block it with networking routes).
A less tedious method is to use an IPS that actively manages those kinds of things automatically for you.
Adding routes to systems, or rules to firewalls, is very time consuming and usually too “permanent” (not recommended as a first resort for direct end-user action).
In other words, pass that along to whomever protects your network.