all ip addresses of machines in the local network

[damacy]

hi, there. i have a problem writing a program which can obtain ip
addresses of machines running in the same local network.

say, there are 4 machines present in the network; [a], [b], [c] and [d]
and if i run my program on [a], it should be able to find "host names"
and "ip addresses" of the other machines; [b], [c] and [d]?

i have read some threads posted on this group, however, they only work
for localhost, not the entire network.

any hints if possible?

thanks for your time.

regards, damacy