This is not even in the same class as nmap. This simply tries to do the "ping scan" mode of nmap faster. The *only* thing it does that (I dont think) nmap does is auto-discovery of subnets based on nothing other than your IP address. It is designed for discovery of the local network, not really anything over the internet (relying on broadcast pinging for discovery, among other things.)
Also, the class-c subnet scan routine (SubnetScanner) scans all discovered subnets in parallel, resulting in *much* quicker results than nmap -sP.
Again, in *no way* is this a replacement for nmap - only a discovery tool. In fact, I'm using this to feed hosts to nmap for classification, combining the results from xprobe2 and feeding them through a statistical classifier to normalize hosts into defined subtypes. nmap has its place - it just doesnt do the auto-discovery that I'd like. Or am I wrong on that, and there's an nmap switch that does that too? :-)
