А что с bareos?
$ host bareos.com
bareos.com has address 81.173.212.166
$ whois 81.173.212.166 | grep inetnum
inetnum: 81.173.212.160 - 81.173.212.175
$ whois 81.173.212.166 | grep mail
abuse-mailbox: abuse@netcologne.de
$ for i in {161..191} ; do ping -n -w 1 -c 1 81.173.212.$i 2>&1 >/dev/null && echo $i ; done
177
178
181
185
189
