Robtex

Up: 72.30.128.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 72.30.128.0/20
Down right: 72.30.144.0/20

IP	Type	Hostname
72.30.132.73	A	gi-0-6.bas1-1-con.ac2.yahoo.com
72.30.132.131	PTR	unknown-72-30-132-x.yahoo.com
72.30.134.169	A	oj6master.inktomisearch.com
72.30.138.200	A	hostmaster.thequeenmarysdarkharbor.com
72.30.142.222	A	llf531072.crawl.yahoo.net
72.30.145.98	PTR	unknown-72-30-145-x.yahoo.com