Robtex

Up: 63.251.122.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 63.251.123.0/25
Down right: 63.251.123.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
63.251.123.5	A+PTR	ns.clinicomp.com
63.251.123.5	A	www.clinicomp.com
63.251.123.5	A	web.clinicomp.com
63.251.123.10	A+PTR	smtp1.clinicomp.com
63.251.123.49	A+PTR	smtp2.clinicomp.com
63.251.123.51	A+PTR	smtp0.clinicomp.com