IP 100.120.144.1

Hi, I have an Orbi mesh router with 1 satellite. When I run avast smart scan I’m getting three Netgear routers. Two of the router’s IPs match my Orbi IP’s. The third IP avast lists as 100.120.144.1. When I look on the Orbi’s list of attached devices this IP isn’t listed. When I search for this IP I’m told it’s not valid. Can anyone help explain what this is? Is it my modem?

It belongs to your network