Can I list netboot servers using bless?

At work I'm constantly checking people's computers and needing to netboot to different installers and OS'. Is there a way for me to use the 'bless -netboot' command and list the servers that are available to netboot to? The reason I ask is that on machines older than 2009 if you hold option it gives you the one network drive to boot to. That can get annoying if I'm needing to go to 2-3 different servers and it may just be quicker to use single user.