Robtex

Up: 159.20.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 159.20.20.0/23
Down right: 159.20.22.0/23

IP	Type	Hostname
159.20.20.77	A	adsl22or77.tel.net.ba
159.20.21.36	A+PTR	adsl23or36.tel.net.ba
159.20.21.57	A+PTR	adsl23or57.tel.net.ba
159.20.22.46	PTR	adsl24or46.tel.net.ba
159.20.22.62	A	adsl24or62.tel.net.ba
159.20.23.210	PTR	adsl25or210.tel.net.ba