Robtex

Up: 89.146.30.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 89.146.30.0/25
Down right: 89.146.30.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
89.146.30.0	PTR	rt30bb146-89-0.routit.net
89.146.30.1	PTR	h01p01.smtp.routit.net
89.146.30.1	A	jconnecta.com
89.146.30.1	A	smtp.mkbtele.com
89.146.30.2	PTR	h01p02.smtp.routit.net
89.146.30.2	A	smtp.mkbtele.com
89.146.30.2	A	smtpr1.protelco.nl
89.146.30.3	PTR	relay.routit.net
89.146.30.4	PTR	relay.routit.net
89.146.30.6	A+PTR	iron4.routit.net
89.146.30.6	A	mail.nieuwenhuis-bv.nl
89.146.30.9	PTR	h02p01.smtp.routit.net
89.146.30.9	A	smtp.mkbtele.com
89.146.30.9	A	smtpr1.protelco.nl
89.146.30.10	PTR	h02p02.smtp.routit.net
89.146.30.10	A	smtp.mkbtele.com
89.146.30.10	A	smtpr1.protelco.nl
89.146.30.14	PTR	iron7.routit.net
89.146.30.14	A	tfzinternet.nl
89.146.30.14	A	deliver.keulen.com
89.146.30.17	PTR	h03p01.smtp.routit.net
89.146.30.17	A	smtp.mkbtele.com
89.146.30.17	A	smtpr1.protelco.nl
89.146.30.18	PTR	h03p02.smtp.routit.net
89.146.30.18	A	smtp.mkbtele.com
89.146.30.18	A	smtpr1.protelco.nl
89.146.30.19	PTR	h05p01.smtp.routit.net
89.146.30.19	A	smtpr1.protelco.nl
89.146.30.19	A	mail.containment-systems.com
89.146.30.20	PTR	h05p02.smtp.routit.net
89.146.30.20	A	smtpr1.protelco.nl
89.146.30.20	A	mail.containment-systems.com
89.146.30.22	A+PTR	iron100.routit.net
89.146.30.22	A	mail1.routit.net
89.146.30.22	A	smtpv6.routit.net
89.146.30.25	PTR	h04p01.smtp.routit.net
89.146.30.25	A	smtp.mkbtele.com
89.146.30.25	A	smtpr1.protelco.nl
89.146.30.26	PTR	h04p02.smtp.routit.net
89.146.30.26	A	smtp.mkbtele.com
89.146.30.26	A	smtpr1.protelco.nl
89.146.30.27	PTR	h06p01.smtp.routit.net
89.146.30.27	A	smtpr1.protelco.nl
89.146.30.27	A	mail.containment-systems.com
89.146.30.28	PTR	h06p02.smtp.routit.net
89.146.30.28	A	smtpr1.protelco.nl
89.146.30.28	A	mail.containment-systems.com
89.146.30.29	PTR	rt30bb146-89-29.routit.net
89.146.30.29	A	smtp1.routit.net
89.146.30.30	PTR	h07p02.smtp.routit.net
89.146.30.30	A	mail1.routit.net
89.146.30.30	A	smtpv6.routit.net
89.146.30.117	PTR	rt30bb146-89-117.routit.net