192.168.1.255 is a subnet broadcast. 255.255.255.255 is a broadcast address.
What OSs are there on that subnet? If it consists of windows only machines you'll never get a response. A Windows machine will not respond to a broadcast ping (by default). A linux machine may respond depending on the configuration (read: distro). Both have the option to turn it on or off.
Please note: You should make sure it's turned off. If it's turned on your network is vulnerable to a smurf attack.
As for nmap, try nmap -sP -vv -n 192.168.1.255
Try and send a SYN packet to 192.168.1.255/port 80 i.e. and see what happens..not sure what should though..Originally posted here by MsMittens
No TCP port can be broadcast so to speak.
nmap -sS -vv -n -p80 -P0 192.168.1.255 should do the trick.
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