Robtex

Up: 63.251.64.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 63.251.66.0/24
Down right: 63.251.67.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
63.251.66.1	A+PTR	postagemachine.arc.internap.com
63.251.66.11	A+PTR	acs-esb2.internap.com
63.251.66.13	A+PTR	acs-esb4.internap.com
63.251.66.15	A+PTR	acs-web1.internap.com
63.251.66.15	A	internap.sg
63.251.66.15	A	www.grxdns.net
63.251.66.17	PTR	acs-web5.internap.com
63.251.66.19	A	mail.inapqa.com
63.251.66.20	A+PTR	acs-adfsproxy1.internap.com
63.251.66.21	A+PTR	acs-adfsproxy2.internap.com
63.251.66.23	A+PTR	acs-adfssrv2.internap.com
63.251.66.30	PTR	sslockbower2.acs.internap.com
63.251.66.30	A	www.ubersmith.com
63.251.66.30	A	ubersmith.com
63.251.66.36	A+PTR	domain-test.acs.internap.com
63.251.66.45	PTR	sweng-desktop19.acs.internap.com
63.251.66.51	A+PTR	kb.internap.com
63.251.66.51	A	internap.com
63.251.66.51	A	www.internap.com
63.251.66.53	A	www.inap.com
63.251.66.53	A	inap.com
63.251.66.63	A+PTR	dhcp-63-251-66-63.acs.internap.com
63.251.66.68	A+PTR	dhcp-63-251-66-68.acs.internap.com
63.251.66.78	A+PTR	dhcp-63-251-66-78.acs.internap.com
63.251.66.79	A+PTR	dhcp-63-251-66-79.acs.internap.com
63.251.66.80	PTR	dhcp-63-251-66-80.acs.internap.com
63.251.66.87	A+PTR	dhcp-63-251-66-87.acs.internap.com
63.251.66.97	A+PTR	dhcp-63-251-66-97.acs.internap.com
63.251.66.144	A+PTR	dhcp-63-251-66-144.acs.internap.com
63.251.66.179	A+PTR	dhcp-63-251-66-179.acs.internap.com
63.251.66.201	A+PTR	dhcp-63-251-66-201.acs.internap.com
63.251.67.12	A	cfreas.acs.internap.com
63.251.67.20	A	catfishtyphoon.com
63.251.67.102	A	dhcp-63-251-67-102.acs.internap.com