Robtex

Up: 64.99.160.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 64.99.176.0/21
Down right: 64.99.184.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
64.99.176.10	PTR	manage.opensrs.net
64.99.176.10	A	manage.opensrs.com
64.99.176.20	A+PTR	approve.domainadmin.com
64.99.176.20	A	domain-verification.squarespace.com
64.99.176.20	A	approvedomainadmin.com
64.99.176.21	PTR	approve.hover.com
64.99.176.38	A	approve.name-services.com
64.99.176.202	A+PTR	wildcard.servicecontrolpanel.com
64.99.176.202	A	test.servicecontrolpanel.com
64.99.176.202	A	www.servicecontrolpanel.com
64.99.176.203	PTR	wildcard.managednsservice.com
64.99.176.210	A	resellers2-test.opensrs.net
64.99.176.215	A	pre.opensrs.net
64.99.178.10	A+PTR	farm.domainadmin.com
64.99.178.10	A	randy-maugans-i-iz-a-netelligent-limestone-geekstorage-whore.domainadmin.com
64.99.178.10	A	getgomobi.domainadmin.com
64.99.178.12	PTR	domainadmin.pre.tucows.com
64.99.180.18	A+PTR	smtprelay018.registrarmail.net
64.99.180.19	A+PTR	smtprelay019.registrarmail.net
64.99.180.22	A+PTR	smtprelay022.registrarmail.net