w(1) behaviour has changed with brien commit in w.c revision 1.48.
Funny, but looks like '-n' options works right after commit, not before.
The reason is utmp holds a host name and w(1) with '-n' flag _do_ resolve hostname back in IP address and without '-n' don't resolve it.
It's confised.
IMHO to be more robust, we should make utmp to hold an IP address instead of a hostname and change all applications that use it. As bonus it will fix a delay on login when resolving does not work. And last(1) will show more useful IP address instead of changable hostname.
But I'm not sure about standards.
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