Robtex

Up: 69.72.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 69.72.44.0/23
Down right: 69.72.46.0/23

IP	Type	Hostname
69.72.44.1	A+PTR	m44-1.mailgun.net
69.72.44.2	A+PTR	m44-2.mailgun.net
69.72.44.3	A	m44-3.mailgun.net
69.72.44.4	A+PTR	m44-4.mailgun.net
69.72.44.46	A	m44-46.mailgun.net
69.72.44.50	A	m44-50.mailgun.net
69.72.44.52	PTR	core-east-22-52.dynamic-dialup.coretel.net
69.72.44.53	PTR	core-east-22-53.dynamic-dialup.coretel.net
69.72.44.210	PTR	gpv0.email-messaging.com
69.72.44.218	A	core-east-22-218.dynamic-dialup.coretel.net
69.72.45.13	PTR	core-east-23-13.dynamic-dialup.coretel.net
69.72.45.13	A	mail.joper.ru
69.72.45.48	A	m45-48.mailgun.net
69.72.45.49	A	m45-49.mailgun.net
69.72.45.50	A	m45-50.mailgun.net
69.72.45.51	A	m45-51.mailgun.net
69.72.45.52	A	m45-52.mailgun.net
69.72.45.53	A	m45-53.mailgun.net
69.72.45.55	PTR	core-east-23-55.dynamic-dialup.coretel.net
69.72.45.55	A	m45-55.mailgun.net
69.72.45.56	A	m45-56.mailgun.net
69.72.45.57	A	m45-57.mailgun.net
69.72.45.59	A	m45-59.mailgun.net
69.72.45.63	PTR	core-east-23-63.dynamic-dialup.coretel.net
69.72.45.79	A	cf-notify.com
69.72.45.122	PTR	m45-122.mailgun.net
69.72.45.146	A	m45-146.mailgun.net
69.72.45.149	PTR	notify.vivid.money
69.72.45.157	A	voft.email-messaging.com
69.72.45.213	PTR	relay.giveawaygorilla.com
69.72.46.77	A	m46-77.mailgun.net
69.72.46.99	A	core-east-24-99.dynamic-dialup.coretel.net
69.72.46.149	PTR	m46-149.mailgun.net
69.72.46.156	PTR	m46-156.mailgun.net
69.72.46.244	PTR	m46-244.mailgun.net
69.72.47.29	A+PTR	so47-29.emailbyrealgreen.com
69.72.47.37	A	m47-37.mailgun.net
69.72.47.70	PTR	m47-70.mailgun.net
69.72.47.80	PTR	m47-80.mailgun.net
69.72.47.98	PTR	smbmail6.mail.tetadrogerie.cz
69.72.47.108	A	m47-108.mailgun.net
69.72.47.112	A+PTR	mg112.chiarezza.it
69.72.47.113	A	m47-113.mailgun.net
69.72.47.146	PTR	m47-146.mailgun.net
69.72.47.149	A	m47-149.mailgun.net
69.72.47.163	PTR	relay.app.bamboohr.com
69.72.47.173	PTR	smtp-relay2.m.evaneos.com
69.72.47.185	PTR	core-east-25-185.dynamic-dialup.coretel.net
69.72.47.197	A	m47-197.mailgun.net
69.72.47.233	PTR	core-east-25-233.dynamic-dialup.coretel.net