Can Wireshark automatically resolve the IP address into host names?

When you enable name resolution (Edit - Preferences - Name Resolution)

Wireshark will resolve ip addresses to hostnames when the capture file contains DNS traffic or when you have a hosts file in your profile that maps ip addresses to hostnames.

You can also 'Use an external name resolver' to resolve the IP addresses using your DNS when you open the trace file. This might cause heavy UDP traffic from your machine if you are looking at large captures though so be cautious with this option.
Regards Matthias