Robtex

Up: 194.121.64.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 194.121.68.0/23
Down right: 194.121.70.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
194.121.68.27	PTR	mail.scansys.nl
194.121.68.219	PTR	static.kpn.net
194.121.69.55	PTR	static.kpn.net
194.121.69.88	PTR	static.kpn.net
194.121.69.170	PTR	static.kpn.net
194.121.70.170	A	mail.apeholland.ru
194.121.70.170	A	mail.capeholland.com
194.121.70.170	A	mail.cape-holland.nl
194.121.71.27	PTR	mail.scansys.nl
194.121.71.94	PTR	static.kpn.net
194.121.71.189	PTR	static.kpn.net
194.121.71.232	PTR	static.kpn.net