Robtex

Up: 77.81.4.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 77.81.5.0/25
Down right: 77.81.5.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
77.81.5.0	PTR	n.0.77.eadtel.com
77.81.5.2	PTR	b.2.77.eadtel.com
77.81.5.2	A	ns1.vps.house
77.81.5.2	A	vps.house
77.81.5.204	PTR	mailx.eadtel.com
77.81.5.204	PTR	mailx.alphatelecom.ro
77.81.5.204	PTR	mailx.delta-sulina.ro
77.81.5.255	PTR	255.77.eadtel.com