Robtex

Up: 69.57.4.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 69.57.4.0/25
Down right: 69.57.4.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
69.57.4.2	A+PTR	na-mail.smartmailservers.com
69.57.4.3	PTR	mail.smartmailservers.com
69.57.4.3	A	mail.scotiabankgillerprize.ca
69.57.4.3	A	mail.vaughanpanthers.ca
69.57.4.9	A	outbound.smartmailservers.com
69.57.4.10	A+PTR	mail0.smartmailservers.com
69.57.4.10	A	postmaster.smartmailservers.com
69.57.4.10	A	postmaster.parafx.com
69.57.4.11	A	mail1.smartmailservers.com
69.57.4.12	A	mail2.smartmailservers.com
69.57.4.13	A	mail3.smartmailservers.com
69.57.4.14	A	mail4.smartmailservers.com
69.57.4.15	A	mail5.smartmailservers.com
69.57.4.84	PTR	net-04-84.smarthostingservers.com
69.57.4.87	PTR	net-04-87.smarthostingservers.com
69.57.4.146	PTR	net-04-146.smarthostingservers.com
69.57.4.185	PTR	net-04-185.smarthostingservers.com