Quick context: Home network, performing some DPI on my perimeter router (Ubiquiti EdgeRouter Lite) that governs 2 internal subnets separating my traffic from a bunch of roommate devices. No IDS on the network yet, so I don't have many logs to investigate.
I noticed an IP outside of the private range via DPI dashboard. I have pretty strict firewall rules and haven't seen outside IPs before. The address responds to pings and has a few services up/filtered, but no whois information or nslookup can be found. Visiting this IP's HTTP server lands me at a page displaying "Monitoring Page - sorry-hostname-not-available.imrworldwide.com". From https://www.findip-address.com/ it appears to be a local business?
All-in-all I'm just a little confused. Should I be concerned about this? Is this just Ubiquiti being buggy and doing weird things? Regardless, I'm implementing an IDS and making a tin-foil hat tonight :)