;)
Now I see, it is HP-UX. Does not have nscd, and no getent.
My /etc/nsswitch.conf recommendations are valid nevertheless.
While I wonder what HP-UX does with ipnodes...it looks like this line...
host 192.168.1.39
and
getent hosts 192.168.1.39
should give the same hostname.
getent (if available on your system) uses the libc defaults that is normally /etc/nsswitch.conf, eventually through...