How to detect all devices in a LAN?

Question

I want to detect all devices in a LAN which have IP: 10.x.x.x Mask: 255.0.0.0. I first wrote a synchronous ping program to ping IPs one by one, but it's tooooo slow. Therefore I improved it by using asynchronous ping, then it's much faster. Now I can use it to detect 10.x.0~255.0~255 in an acceptable time. But it still use tooooooooooooo long time to detect all the IPs 10.0~255.0~255.0~255.

Is there any method/protocol that can just broadcast one message and let all devices in a LAN to respond, so I can detect all the devices? (either Ethernet broadcast or UDP/IP broadcast or any other broadcast.) (I've researched ARP & ICMP but haven't find suitable methods.)

Or any other method even don't need broadcast? I just need to detect all the devices, any method is OK.

Answer 1

Not sure if it's what you are looking for but you can go in command prompt and run the command:

arp -a