Robtex

Up: 212.121.122.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 212.121.123.0/25
Down right: 212.121.123.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
212.121.123.4	PTR	rt123bb121-212-4.routit.net
212.121.123.6	A	hotel-marquette.com
212.121.123.20	PTR	rt123bb121-212-20.routit.net
212.121.123.20	A	mail.jcdecaux.nl
212.121.123.34	A	mail.avs-bv.nl
212.121.123.41	PTR	rt123bb121-212-41.routit.net
212.121.123.45	A+PTR	www.erasmusbooks.nl
212.121.123.45	A	www.erasmus.fr
212.121.123.45	A	erasmus.fr
212.121.123.55	A	mail.realwebsolutions.nl
212.121.123.58	PTR	rt123bb121-212-58.routit.net
212.121.123.61	PTR	rt123bb121-212-61.routit.net
212.121.123.61	A	serviceweb.kliksafe.nl
212.121.123.62	A	signup.kliksafe.nl
212.121.123.145	A	mail.benjamins.nl
212.121.123.148	A	d-clinics.nl
212.121.123.160	A	mijndcb.nl
212.121.123.179	PTR	rt123bb121-212-179.routit.net
212.121.123.179	A	www.normeringarbeid.nl
212.121.123.179	A	normeringflexwonen.nl
212.121.123.181	A+PTR	mail.wispa.nl
212.121.123.181	A	mx1.wispa.nl
212.121.123.193	A	heliviewct.com
212.121.123.198	PTR	rt123bb121-212-198.routit.net
212.121.123.198	A	cms.heliview.be
212.121.123.198	A	heliviewct.nl
212.121.123.201	PTR	ns1.weritechhosting.nl
212.121.123.203	PTR	rt123bb121-212-203.routit.net
212.121.123.203	A	buvocastings.nl
212.121.123.203	A	mail.buvocastings.com
212.121.123.206	PTR	ns1.weritech.nl
212.121.123.206	A	powerpixc.com
212.121.123.206	A	led-driver-dimmable.com
212.121.123.208	PTR	www5.jds.nl
212.121.123.208	A	statuswebwww.dyndns.org
212.121.123.215	A	mxmail.ia.nl
212.121.123.224	PTR	rt123bb121-212-224.routit.net
212.121.123.234	PTR	rt123bb121-212-234.routit.net
212.121.123.238	A	mail.alantvrouw.nl
212.121.123.238	A	mail.bergmanclinics.com