Robtex

Up: 198.73.30.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 198.73.30.0/25
Down right: 198.73.30.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
198.73.30.2	A+PTR	ljsdns01.ljsilvers.com
198.73.30.3	A+PTR	ljsdns02.ljsilvers.com
198.73.30.72	A+PTR	autodiscover.ljsilvers.com
198.73.30.72	A+PTR	ljsxch01.ljsilvers.com
198.73.30.72	A+PTR	mail.ljsilvers.com
198.73.30.73	A	mail.ljsilvers.com