Robtex

Up: 89.251.128.0/24
Can't show all results, try to descend to a more specific CIDR
Down left: 89.251.128.0/26
Down right: 89.251.128.64/26
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
89.251.128.1	A	fw128.microplan.de
89.251.128.5	A+PTR	ns01.rz-24.de
89.251.128.6	PTR	ns01.rz-24.de
89.251.128.6	A	ns-pri.microplan.de
89.251.128.8	A	monitor.microplan.de
89.251.128.10	A+PTR	ns.deltacity.net
89.251.128.11	A+PTR	ns2.deltacity.net
89.251.128.11	A	ns03.rz-24.de
89.251.128.12	A	ns05.rz-24.de
89.251.128.12	A	ns3.deltacity.net
89.251.128.14	A	vgate.microplan.de
89.251.128.14	A	mpmxin01.microplan.de
89.251.128.14	A	smtp10.deltacity.net
89.251.128.15	A+PTR	vgmx02.in.rz-24.de
89.251.128.15	A	vgate.microplan.de
89.251.128.15	A	mpmxin01.microplan.de
89.251.128.16	A+PTR	gw.microplan.de
89.251.128.16	A	mail02.mx.microplan.de
89.251.128.20	A+PTR	mailin01.in.rz-24.de
89.251.128.21	PTR	mail.deltacity.net
89.251.128.21	A	mailin01.in.rz-24.de
89.251.128.22	A	smtp.rz-24.de
89.251.128.22	A	smtp01.out.rz-24.de
89.251.128.24	A	mpmxin01.microplan.de
89.251.128.24	A	smtp20.deltacity.net
89.251.128.25	A+PTR	smtpmx05.microplan.de
89.251.128.26	PTR	smtpmx05.microplan.de
89.251.128.27	PTR	smtp3.mx.deltacity.net
89.251.128.27	A	smtp.rz-24.de
89.251.128.27	A	smtp02.out.rz-24.de
89.251.128.28	A+PTR	mail01.rz-24.de
89.251.128.28	A	mail.juergens-guss.de
89.251.128.28	A	mail.alstermenue.de
89.251.128.29	A+PTR	mail01.rz-24.de
89.251.128.29	A	mail.eureka-emsdetten.de
89.251.128.29	A	mail02.tekton-bending.com
89.251.128.31	A+PTR	smtp01.out.rz-24.de
89.251.128.32	A+PTR	smtp02.out.rz-24.de
89.251.128.37	A+PTR	smtp03.out.rz-24.de
89.251.128.37	A	smtp04.mx.deltacity.net
89.251.128.44	A	smtpmx07.in.rz-24.de
89.251.128.47	A+PTR	webmail.mp-mail.de
89.251.128.50	A+PTR	webmail.mp-mail.de
89.251.128.50	A	mail.fdfbeijing.com
89.251.128.50	A	mp-mail.de
89.251.128.52	A+PTR	hosting01.microplan.de
89.251.128.53	A	mpweb1.microplan.de
89.251.128.57	A+PTR	hosting02.microplan.de
89.251.128.57	A	raessvp.de
89.251.128.60	PTR	ps1.microplan.de
89.251.128.60	A	raessvp.de
89.251.128.60	A	ps2.microplan.de
89.251.128.61	A+PTR	ps2.microplan.de
89.251.128.61	A	infas-enermetric.de
89.251.128.61	A	pportal.microplan.de
89.251.128.71	PTR	smtpmx08.in.rz-24.de
89.251.128.71	A	vgate.microplan.de
89.251.128.71	A	mpmxin01.microplan.de
89.251.128.72	A+PTR	smtpmx09.in.rz-24.de
89.251.128.72	A	vgate.microplan.de
89.251.128.72	A	mpmxin01.microplan.de
89.251.128.80	A	mail.infas-enermetric.de
89.251.128.111	A	ispconfig.rz-24.de
89.251.128.114	A+PTR	securesmtp.rz-24.de
89.251.128.114	A	mx01.in.rz-24.de