Robtex

Up: 198.16.24.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 198.16.26.0/24
Down right: 198.16.27.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
198.16.26.24	A+PTR	mail1.korbel.com
198.16.26.24	A	mail1.korbelbrandy.com
198.16.26.24	A	mail1.heckestates.com
198.16.27.24	A+PTR	mail2.korbel.com
198.16.27.24	A	mail2.heckestates.com
198.16.27.24	A	mail2.korbelmail.com