Robtex

Up: 76.13.232.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 76.13.232.0/23
Down right: 76.13.234.0/23

IP	Type	Hostname
76.13.232.32	A+PTR	fac1.cl1.ads.adx.vip.ac4.yahoo.com
76.13.232.32	A	fac.apx.yahoodns.net
76.13.232.33	PTR	unknown-76-13-232-x.yahoo.com
76.13.234.32	A+PTR	fac1.cl2.ads.adx.vip.ac4.yahoo.com
76.13.234.32	A	fac.apx.yahoodns.net
76.13.234.33	PTR	unknown-76-13-234-x.yahoo.com
76.13.234.63	PTR	unknown-76-13-234-x.yahoo.com
76.13.234.64	A+PTR	conf1.npn.adx.vip.ac4.yahoo.com
76.13.234.72	A	temp1.fac.cl2.adx.ac4.yahoo.com
76.13.234.74	PTR	unknown-76-13-234-x.yahoo.com
76.13.234.93	PTR	unknown-76-13-234-x.yahoo.com
76.13.234.136	PTR	unknown-76-13-234-x.yahoo.com
76.13.234.201	PTR	unknown-76-13-234-x.yahoo.com
76.13.234.233	PTR	unknown-76-13-234-x.yahoo.com