Robtex

Up: 212.23.138.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 212.23.138.0/25
Down right: 212.23.138.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
212.23.138.11	A+PTR	mt01.de.tmr.net
212.23.138.17	A+PTR	fw01.ewmr.de
212.23.138.26	A+PTR	mail.egr-bochum.de
212.23.138.49	A	gate2.crosscan.com
212.23.138.53	A	meta.crosscan.com
212.23.138.54	A	mail.crosscan.com
212.23.138.55	A	file.crosscan.com
212.23.138.56	A	gate-neu.crosscan.com
212.23.138.56	A	gate.crosscan.com
212.23.138.75	A	groenemeyer-medizin.com
212.23.138.75	A	interventionelle-schmerztherapie.de
212.23.138.75	A	groenemeyer-institut-hamburg.com
212.23.138.106	A+PTR	do-gg-fw01.de.tmr.net
212.23.138.114	A	gw1.tekomedia-intern.de
212.23.138.114	A	bo-teko-fw01.de.tmr.net
212.23.138.116	A+PTR	mail.tekomedia.de
212.23.138.117	A	tekomedia-intern.de
212.23.138.117	A	ex.tekomedia.de
212.23.138.130	A+PTR	asl.bocad.com
212.23.138.130	A	asl.bocad.de
212.23.138.130	A	asl.bocad.mobi
212.23.138.131	A+PTR	mail.bocad.com
212.23.138.131	A	mail.bocad.mobi
212.23.138.131	A	mail.bocad.de
212.23.138.133	A	www-cache.bocad.com
212.23.138.134	A	dns.bocad.com
212.23.138.137	A	ftp.bocad.com
212.23.138.162	A	www.logiball.biz
212.23.138.162	A	mail.logiball.de
212.23.138.162	A	www.mapit.de
212.23.138.194	A+PTR	vpn.novero.com
212.23.138.195	A	mail.novero.com
212.23.138.198	A+PTR	mx.novero.com
212.23.138.200	A+PTR	wwwext.novero.com
212.23.138.228	A+PTR	pns.ce-n.com
212.23.138.236	A+PTR	smtp.ce-n.de
212.23.138.236	A	spsmail.ce-n.com
212.23.138.240	A	www.ce-n.com
212.23.138.240	A	ce-n.com