Robtex

Up: 212.123.96.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 212.123.112.0/21
Down right: 212.123.120.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
212.123.112.5	PTR	gate.rth.tretkowski.de
212.123.112.57	PTR	gw.cr-1-2.muc1.content-core.net
212.123.112.58	PTR	fw-of.muc1.ip-exchange.de
212.123.113.34	A	styria.info
212.123.118.13	A	mail.wasntme.de
212.123.119.31	A	mail.visage-imaging.com
212.123.119.31	A	mail.visage-imaging.net
212.123.119.31	A	mail.visageimaging.net
212.123.123.10	A	lo0.rtr1.colo1.nbg1.ip-exchange.de
212.123.123.10	A	rtr1.colo1.nbg1.ip-exchange.de
212.123.123.79	A	five2twelve.de
212.123.123.79	A	mail.five2twelve.de
212.123.123.226	PTR	p1-91.rtr1.colo1.nbg1.content-colo.net
212.123.124.1	PTR	gw.rtr2.colo1.nbg1.content-colo.net
212.123.124.1	A	hosgate.your-server.de
212.123.124.3	A+PTR	apc1.ims.de
212.123.124.3	A	mail.dbsystems.de
212.123.124.4	A+PTR	apc2.ims.de
212.123.124.90	A	euro-ix.de
212.123.125.1	PTR	gw.rtr2.colo1.nbg1.content-colo.net
212.123.125.1	A	hosgate.your-server.de
212.123.126.1	PTR	tenge3-3.47.cr1.muc2.content-core.net
212.123.126.1	A	hosgate.your-server.de
212.123.126.34	PTR	ge1-2.cr1.nbg5.content-core.net
212.123.126.65	PTR	gw.rtr1.core1.nbg1.content-core.net
212.123.126.67	A+PTR	endace02.ip-exchange.de
212.123.126.68	A+PTR	endace03.ip-exchange.de
212.123.126.69	A	endace04.ip-exchange.de
212.123.126.75	A	acc02.ip-exchange.de
212.123.126.81	PTR	ge6-1.cr3.nbg1.content-core.net
212.123.126.115	PTR	cs2.muc1.content-core.net
212.123.127.1	A	hosgate.your-server.de
212.123.127.210	A	mail.gvg-media.de
212.123.127.210	A	gvg-media.de