Robtex

Up: 78.128.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 78.128.44.0/23
Down right: 78.128.46.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
78.128.44.1	PTR	ip-44-1.powernet.bg
78.128.44.15	PTR	host.44.15.bol-bg.com
78.128.44.19	PTR	host.44.19.bol-bg.com
78.128.44.28	PTR	host.44.28.bol-bg.com
78.128.44.46	PTR	host.44.46.bol-bg.com
78.128.44.55	PTR	host.44.55.bol-bg.com
78.128.44.65	PTR	host.44.65.bol-bg.com
78.128.44.74	PTR	host.44.74.bol-bg.com
78.128.44.105	PTR	host.44.105.bol-bg.com
78.128.44.109	PTR	host.44.109.bol-bg.com
78.128.44.119	PTR	host.44.119.bol-bg.com
78.128.44.141	PTR	host.44.141.bol-bg.com
78.128.44.152	PTR	host.44.152.bol-bg.com
78.128.44.155	PTR	host.44.155.bol-bg.com
78.128.44.201	PTR	host.44.201.bol-bg.com
78.128.44.209	PTR	host.44.209.bol-bg.com
78.128.44.248	PTR	host.44.248.bol-bg.com
78.128.44.253	PTR	host.44.253.bol-bg.com
78.128.45.23	PTR	host.45.23.bol-bg.com
78.128.45.33	PTR	host.45.33.bol-bg.com
78.128.45.41	PTR	host.45.41.bol-bg.com
78.128.45.82	PTR	host.45.82.bol-bg.com
78.128.45.83	PTR	mx.ogradi.com
78.128.45.83	A	rossima.com
78.128.45.83	A	www.ogradi.com
78.128.45.94	PTR	host.45.94.bol-bg.com
78.128.45.114	PTR	host.45.114.bol-bg.com
78.128.45.117	PTR	host.45.117.bol-bg.com
78.128.45.121	PTR	host.45.121.bol-bg.com
78.128.45.127	PTR	host.45.127.bol-bg.com
78.128.45.147	PTR	host.45.147.bol-bg.com
78.128.45.207	PTR	host.45.207.bol-bg.com
78.128.45.214	A	ns2.you-design.org
78.128.45.214	A	ns1.you-design.org
78.128.45.214	A	mail.you-design.org
78.128.45.223	PTR	host.45.223.bol-bg.com
78.128.45.236	PTR	host.45.236.bol-bg.com
78.128.45.245	PTR	host.45.245.bol-bg.com
78.128.46.15	PTR	host.46.15.bol-bg.com
78.128.46.48	PTR	ip-46-48.powernet.bg
78.128.46.48	A	prawec82.com
78.128.46.153	PTR	host.46.153.bol-bg.com
78.128.46.194	PTR	host.46.194.bol-bg.com
78.128.47.4	PTR	ns27.rookdns.com
78.128.47.18	PTR	host.47.18.bol-bg.com
78.128.47.33	PTR	host.47.33.bol-bg.com
78.128.47.123	PTR	ip-47-123.powernet.bg
78.128.47.123	A	mmariner.eu
78.128.47.158	PTR	host.47.158.bol-bg.com
78.128.47.182	PTR	ip-47-182.powernet.bg