How to use nmap to ping domains and get the output as domains and not IPs

nmap versions lower than 5.30BETA1:

nmap -sP 192.168.1.*

newer nmap versions:

nmap -sn 192.168.1.*

This gives me hostnames along with IP adresses, and only pings the hosts to discover them. This will only give you the hostnames if you run it as root.

EDIT: As of Nmap 5.30BETA1 [2010-03-29] -sP has been replaced with -sn as the preferred way to do ping scans, while skipping port scanning, just like the comments indicate:

Previously the -PN and -sP options were recommended. This establishes a more regular syntax for some options that disable phases of a scan:

• -n no reverse DNS
• -Pn no host discovery
• -sn no port scan

fping might be a better tool than the stock ping you are using. What OS are you on?

• "fping differs from ping in that you can specify any number of targets on the command line, or specify a file containing the lists of targets to ping."
• "Instead of sending to one target until it times out or replies, fping will send out a ping packet and move on to the next target in a round-robin fashion."
• "Unlike ping, fping is meant to be used in scripts, so its output is designed to be easy to parse."

Example:

fping -c1 -t500 10.0.0.1 10.0.0.2 10.0.0.3 10.0.0.4

• -c Number of request packets to send to each target.
• -t Initial target timeout in milliseconds