Robtex

Up: 194.121.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 194.121.40.0/23
Down right: 194.121.42.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
194.121.40.81	PTR	static.kpn.net
194.121.40.161	PTR	static.kpn.net
194.121.40.164	A	mail.tb-expertise.nl
194.121.41.113	PTR	static.kpn.net
194.121.42.83	A	mail2.lexter.nl
194.121.42.83	A	mail2.herke.nl
194.121.42.252	PTR	static.kpn.net
194.121.42.252	A	mail-secure1.brack-capital.com
194.121.42.252	A	mail-secure.bcre.de
194.121.42.253	PTR	static.kpn.net
194.121.42.253	A	server.bcre.de
194.121.43.10	A	mail.beelentechniek.nl
194.121.43.130	A+PTR	mail1.beunderonde.nl
194.121.43.154	A	mx2.pauw.nl
194.121.43.154	A	mail.pauw.nl
194.121.43.162	PTR	server.uzimet.nl
194.121.43.163	PTR	server.uzimet.nl
194.121.43.170	A	mx2.euroliquids.nl