Robtex

Up: 194.121.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 194.121.16.0/23
Down right: 194.121.18.0/23

IP	Type	Hostname
194.121.16.6	PTR	static.kpn.net
194.121.16.49	PTR	static.kpn.net
194.121.16.49	A	trovis.nl
194.121.17.2	A	mail.t2logistics.nl
194.121.17.5	PTR	static.kpn.net
194.121.17.36	A	fallback.europeesplatform.nl
194.121.17.39	PTR	static.kpn.net
194.121.18.130	A	mail.tbb-kantoorinrichting.nl
194.121.18.130	A	mail.tbb-totaal.nl
194.121.18.193	PTR	static.kpn.net
194.121.18.242	PTR	static.kpn.net
194.121.19.2	PTR	static.kpn.net
194.121.19.9	PTR	static.kpn.net
194.121.19.75	PTR	telewerken.ancra.nl
194.121.19.75	A	mail.marvineurope.com
194.121.19.83	A	mail2.matchingcapabilities.nl