broadcast ip

I have cable and was wondering how many clients are online at the same time
I am. I heard you can see this by pinging the broadcast ip address. I tried
this but to no avail. Lets say my ip was 215.12.15.41 and subnetmask was
255.255.255.0. Knowing this, should I be able to determine what the
broadcast ip is?

> this but to no avail. Lets say my ip was 215.12.15.41 and subnetmask was

> 255.255.255.0. Knowing this, should I be able to determine what the
> broadcast ip is?


this is easy. leave the masked bits and set the rest to 1, in you case it is 215.12.15.255
But i doubt that your method will work. To get better results, do simple ping scan (ping every host in the range)

Andrey Kubyshev wrote:
>
> > this but to no avail. Lets say my ip was 215.12.15.41 and subnetmask was
> > 255.255.255.0. Knowing this, should I be able to determine what the
> > broadcast ip is?
>
> this is easy. leave the masked bits and set the rest to 1, in you case it is 215.12.15.255
> But i doubt that your method will work. To get better results, do simple ping scan (ping every host in the range)

It is most unlikely to work. Windows doesn't respond to broadcast pings
and the chances are that most of the other customers in your subnet are
using it. Then the ISP may be preventing pings and many customers will
be running firewalls which block them.

I would consider doing this to be bad manners too.

Regards, Ian