Robtex

Up: 78.128.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 78.128.48.0/23
Down right: 78.128.50.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
78.128.48.14	PTR	host.48.14.bol-bg.com
78.128.48.16	PTR	host.48.16.bol-bg.com
78.128.48.17	PTR	host.48.17.bol-bg.com
78.128.48.37	PTR	host.48.37.bol-bg.com
78.128.48.63	PTR	host.48.63.bol-bg.com
78.128.48.79	PTR	host.48.79.bol-bg.com
78.128.48.88	PTR	host.48.88.bol-bg.com
78.128.48.89	PTR	ip-48-89.powernet.bg
78.128.48.97	PTR	host.48.97.bol-bg.com
78.128.48.108	PTR	host.48.108.bol-bg.com
78.128.48.112	PTR	host.48.112.bol-bg.com
78.128.48.116	PTR	host.48.116.bol-bg.com
78.128.48.133	PTR	host.48.133.bol-bg.com
78.128.48.148	PTR	host.48.148.bol-bg.com
78.128.48.191	PTR	host.48.191.bol-bg.com
78.128.48.221	PTR	host.48.221.bol-bg.com
78.128.48.227	PTR	host.48.227.bol-bg.com
78.128.48.229	PTR	host.48.229.bol-bg.com
78.128.49.10	PTR	ns27.rookdns.com
78.128.49.23	PTR	ip-49-23.powernet.bg
78.128.49.63	PTR	ip-49-63.powernet.bg
78.128.49.70	PTR	ip-49-70.powernet.bg
78.128.49.95	PTR	ns27.rookdns.com
78.128.49.146	PTR	ip-49-146.powernet.bg
78.128.49.149	PTR	ip-49-149.powernet.bg
78.128.49.164	PTR	host.49.164.bol-bg.com
78.128.49.196	PTR	ip-49-196.powernet.bg
78.128.49.209	PTR	ip-49-209.powernet.bg
78.128.49.228	PTR	ip-49-228.powernet.bg
78.128.49.240	PTR	ip-49-240.powernet.bg
78.128.50.41	PTR	host.50.41.bol-bg.com
78.128.50.47	PTR	host.50.47.bol-bg.com
78.128.50.51	PTR	host.50.51.bol-bg.com
78.128.50.67	PTR	host.50.67.bol-bg.com
78.128.50.115	PTR	host.50.115.bol-bg.com
78.128.50.139	PTR	host.50.139.bol-bg.com
78.128.50.147	PTR	host.50.147.bol-bg.com
78.128.50.251	PTR	host.50.251.bol-bg.com
78.128.51.18	PTR	ip-51-18.powernet.bg
78.128.51.18	A	mail.victorianuts.com
78.128.51.25	PTR	host.51.25.bol-bg.com
78.128.51.26	PTR	rp-gw.rotoprint.bg
78.128.51.26	A	rotoprint.bg
78.128.51.26	A	rotoprint-bg.com
78.128.51.27	PTR	rp-pbx.rotoprint.bg
78.128.51.28	PTR	ip-51-28.powernet.bg
78.128.51.28	A	mx2.rotoprint.bg
78.128.51.28	A	mx.rotoprint.bg
78.128.51.30	PTR	rp-mxpv1.rotoprint.bg
78.128.51.30	A	mx2.rotoprint.bg
78.128.51.30	A	mx.rotoprint.bg
78.128.51.34	PTR	host.51.34.bol-bg.com
78.128.51.42	PTR	bulsyst.com
78.128.51.42	PTR	mail.bulsyst.com
78.128.51.42	PTR	ns.bulsyst.com
78.128.51.67	A	elcorason.users.bol.bg
78.128.51.84	PTR	ip-51-84.powernet.bg
78.128.51.84	A	rotoprint.bg
78.128.51.84	A	rotoprint-bg.com
78.128.51.85	PTR	rp-mx.rotoprint.bg
78.128.51.85	A	mail.rotoprint-bg.com
78.128.51.90	PTR	host.51.90.bol-bg.com
78.128.51.95	PTR	host.51.95.bol-bg.com
78.128.51.108	PTR	host.51.108.bol-bg.com
78.128.51.119	PTR	host.51.119.bol-bg.com
78.128.51.120	PTR	host.51.120.bol-bg.com
78.128.51.150	PTR	host.51.150.bol-bg.com
78.128.51.155	PTR	host.51.155.bol-bg.com
78.128.51.169	PTR	host.51.169.bol-bg.com
78.128.51.177	A	mail.bspools.com
78.128.51.177	A	www.bspools.com
78.128.51.177	A	bspools.com
78.128.51.214	PTR	host.51.214.bol-bg.com