I dunno if it'll do the job you want, but WS Ping Pro (url is for a 30-day shareware) can scan a range of ip's you set, within a timeout you can vary. It won't return specific ping times for each ip, ...

I'm trying to figure out why I can't ping several machines by name. The nameservers in the following example, are running Windows 2008 R2. The nfs servers are running Ubuntu Karmic. NFS1 and NFS2 are ...