Robtex

Up: 197.253.0.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 197.253.0.0/25
Down right: 197.253.0.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
197.253.0.7	A+PTR	autodiscover.mainonecable.com
197.253.0.7	A+PTR	mail.mainonecable.com
197.253.0.7	A+PTR	mailserver.mainonecable.com
197.253.0.9	A+PTR	dev.mainonecable.com
197.253.0.9	A+PTR	horizon.mainonecable.com
197.253.0.9	A+PTR	molgatva.mainonecable.com
197.253.0.67	A	outlook.mainone.net
197.253.0.241	A+PTR	moedyn241.mainonecable.com