Robtex

Up: 194.45.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 194.45.16.0/23
Down right: 194.45.18.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
194.45.16.63	PTR	static.kpn.net
194.45.16.115	A	mail.horse-event.nl
194.45.16.164	PTR	static.kpn.net
194.45.16.164	A	mail.hoteleindhoven.com
194.45.17.79	PTR	static.kpn.net
194.45.17.249	PTR	static.kpn.net
194.45.17.249	A	remote.verenigdejeugdclubslimburg.nl
194.45.18.48	PTR	static.kpn.net
194.45.18.255	PTR	static.kpn.net
194.45.19.0	PTR	static.kpn.net
194.45.19.48	PTR	static.kpn.net
194.45.19.120	PTR	static.kpn.net
194.45.19.194	PTR	static.kpn.net
194.45.19.194	A	webmail.divosa.nl
194.45.19.194	A	mail.divosa.org
194.45.19.224	PTR	static.kpn.net
194.45.19.239	PTR	static.kpn.net