Selfhosted

How do you connect? Is there a domain? Is that domain used for email or any other way that it might circulate?

Also, depends on if the IP address was used for something in the past that was useful to target or not. And finally do you use that IP address outbound a lot, like do you connect to a lot of other services, websites, etc. And finally, does your ISP have geolocation blocks or other filters in place?

It's rare for a process to just scan through all possible IP addresses to find a vulnerable service, there are billions and that would take a very long time. Usually, they use lists of known targets or scan through the addresses owned by certain ISPs. So if you don't have a domain, or that domain is not used for anything else, and you IP address has never gotten on a list in the past, then it's less likely you'll get targeted. But that's no reason to lower your guard. Security through obscurity is only a contributory strategy. Once that obscurity is broken, you're a prime target if anything is vulnerable. New targets get the most attention as they often fix their vulnerabilities once discovered so it has to be used fast, but tend to be the easiest to get lots of goodies out of. Like the person who lives on a side street during trick-or-treat that gives out handfuls of candy to get rid of it fast enough. Once the kids find out, they swarm. Lol