Robtex

Up: 72.13.192.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 72.13.192.0/23
Down right: 72.13.194.0/23

IP	Type	Hostname
72.13.192.6	PTR	mail.xtomic.com
72.13.192.16	PTR	web.webscouts.net
72.13.194.50	PTR	b2024-cust.qmoe.pcisys.net
72.13.194.82	A+PTR	chidlaw.chd01rtr01.qmoe.pcisys.net
72.13.195.43	PTR	imail.mssd14.org
72.13.195.43	A	mssd14mail.mssd14.k12.co.us
72.13.195.45	A	mssd14.k12.co.us