Robtex

Up: 72.226.0.0/16
Can't show all results, try to descend to a more specific CIDR
Down left: 72.226.128.0/18
Down right: 72.226.192.0/18
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.226.152.0	PTR	mta-72-226-152-0.twcny.rr.com
72.226.155.247	PTR	mta-72-226-155-247.twcny.rr.com
72.226.160.0	PTR	mta-72-226-160-0.twcny.rr.com
72.226.162.241	PTR	mta-72-226-162-241.twcny.rr.com
72.226.193.42	PTR	mta-72-226-193-42.ddns.rochester.rr.com
72.226.193.42	A	mathjmendl.org
72.226.193.42	A	hostmaster.mathjmendl.org
72.226.206.86	PTR	mta-72-226-206-86.rochester.rr.com
72.226.219.175	PTR	mta-72-226-219-175.rochester.rr.com
72.226.233.121	A	panicroomstudio.com