IPv6 Display field in Site configuration too short

The display/edit field in the site configuration for IPv6 adresses is too short, you cannot see the full IP:

This isn't even a long address:

2001:xxx:xxxx::xx:xx

But even that one gets hidden before the end.

This is only a display problem.

(BTW: in the IP dropdowns it would be great if the owner of the IP adress is listed as well.)