Robtex

Up: 87.120.142.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 87.120.143.0/25
Down right: 87.120.143.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
87.120.143.40	PTR	mail.aviaso.com
87.120.143.146	PTR	pppoe-146-143.unicsbg.net
87.120.143.146	A	aviaso.co.uk
87.120.143.146	A	aviaso.bg
87.120.143.239	PTR	pppoe-239-143.unicsbg.net
87.120.143.255	PTR	pppoe-255-143.unicsbg.net