Robtex

Up: 188.125.72.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 188.125.76.0/23
Down right: 188.125.78.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
188.125.76.24	PTR	unknown-188-125-76-x.yahoo.com
188.125.77.251	PTR	yts.cx.vip.ch1.yahoo.com
188.125.77.251	A	animalvideos.yahoo.com
188.125.77.251	A	any-yts.cx.a03.yahoodns.net
188.125.78.145	A+PTR	ups-c244.npn.adx.ch1.yahoo.com
188.125.79.42	PTR	unknown-188-125-79-x.yahoo.com
188.125.79.255	PTR	unknown-188-125-79-x.yahoo.com