Robtex

Up: 77.71.64.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 77.71.68.0/23
Down right: 77.71.70.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
77.71.68.50	A+PTR	ip-50-68-71-77.bgwan.com
77.71.68.145	PTR	145-68.konstantinovo.net
77.71.68.153	PTR	153-68.konstantinovo.net
77.71.70.43	PTR	ip-43-70-71-77.ktv-beloslav.net
77.71.70.253	PTR	ip-253-70-71-77.ktv-beloslav.net
77.71.70.255	PTR	ip-255-70-71-77.varnalan.com
77.71.71.0	PTR	ip-0-71-71-77.varnalan.com
77.71.71.60	PTR	ip-60-71-71-77.ktv-beloslav.net
77.71.71.61	PTR	ip-61-71-71-77.ktv-beloslav.net
77.71.71.180	PTR	ip-180-71-71-77.ktv-beloslav.net
77.71.71.180	A	mail.beloslav.org
77.71.71.180	A	beloslav.org