Robtex

Up: 78.128.16.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 78.128.16.0/22
Down right: 78.128.20.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
78.128.16.48	PTR	ns2.onet.bg
78.128.16.49	PTR	ns1.onet.bg
78.128.16.50	PTR	mail.onet.bg
78.128.16.65	PTR	ip-16-65.powernet.bg
78.128.17.2	PTR	ip-17-2.powernet.bg
78.128.17.98	PTR	ip-17-98.powernet.bg
78.128.17.137	PTR	ip-17-137.powernet.bg
78.128.17.153	PTR	ip-17-153.powernet.bg
78.128.17.187	PTR	ip-17-187.powernet.bg
78.128.18.66	PTR	ip-18-66.powernet.bg
78.128.18.70	A	geoptter.bol.bg
78.128.18.74	PTR	ip-18-74.powernet.bg
78.128.18.114	PTR	ip-18-114.powernet.bg
78.128.18.133	A	mail.vakema.com
78.128.18.133	A	zaselanovtsi.info
78.128.18.133	A	dns2.vakema.com
78.128.19.3	PTR	ip-19-3.powernet.bg
78.128.19.4	PTR	ip-19-4.powernet.bg
78.128.19.48	PTR	ns27.rookdns.com
78.128.19.51	PTR	ip-19-51.powernet.bg
78.128.19.97	PTR	ip-19-97.powernet.bg
78.128.19.201	PTR	ip-19-201.powernet.bg
78.128.19.204	A	78-128-19-204.stz.ddns.bulsat.com
78.128.19.219	PTR	ip-19-219.powernet.bg
78.128.19.221	A	78-128-19-221.stz.ddns.bulsat.com
78.128.20.34	PTR	ip-20-34.powernet.bg
78.128.21.1	PTR	ip-21-1.powernet.bg
78.128.21.2	PTR	ip-21-2.powernet.bg
78.128.21.9	PTR	ip-21-9.powernet.bg
78.128.21.194	PTR	ip-21-194.powernet.bg
78.128.21.208	PTR	ip-21-208.powernet.bg
78.128.22.1	PTR	ip-22-1.powernet.bg
78.128.22.73	A+PTR	78-128-22-73.stz.ddns.bulsat.com
78.128.23.10	PTR	ip-23-10.powernet.bg
78.128.23.16	PTR	ip-23-16.powernet.bg
78.128.23.16	A	mail.newobjects.net
78.128.23.16	A	mail.ce-bg.com
78.128.23.67	PTR	ip-23-67.powernet.bg
78.128.23.144	PTR	ip-23-144.powernet.bg
78.128.23.195	PTR	ip-23-195.powernet.bg
78.128.23.208	PTR	ip-23-208.powernet.bg
78.128.23.226	PTR	ip-23-226.powernet.bg
78.128.23.248	PTR	ip-23-248.powernet.bg