@DominikHoffmann said in What is the meaning of this dpinger log entry?:
What does this mean
For future reference, see here.
As @stephenw10 noted, the issue is that your immediate gateway (default route) is not reachable. A much more basic problem than what IP you decide to ping.
As for choosing a target, I usually recommend performing a traceroute to 1.1.1.1 or 8.8.8.8, to help choose a target inside your ISP's infrastructure:
traceroute -I 1.1.1.1
Look for an address that is a hop or two inside your ISPs infrastructure and has fairly consistent response times. YMMV.