Robtex

Up: 193.141.16.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 193.141.16.0/22
Down right: 193.141.20.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
193.141.16.41	PTR	thecoverstory.com
193.141.16.74	PTR	mail.interact-automation.nl
193.141.16.74	A	telecontrolnet.nl
193.141.16.74	A	telecontrolnet.com
193.141.16.75	PTR	mail.interact.nl
193.141.16.75	A	webscada.nl
193.141.17.150	A	practicum-educatief.com
193.141.17.150	A	mail.practicum-educatief.nl
193.141.17.150	A	practicum-educatief.nl
193.141.18.2	PTR	static.kpn.net
193.141.18.3	PTR	static.kpn.net
193.141.18.41	PTR	static.kpn.net
193.141.18.58	PTR	static.kpn.net
193.141.18.137	PTR	static.kpn.net
193.141.18.211	PTR	static.kpn.net
193.141.19.2	PTR	static.kpn.net
193.141.19.8	PTR	static.kpn.net
193.141.19.178	PTR	static.kpn.net
193.141.19.242	PTR	static.kpn.net
193.141.19.248	PTR	static.kpn.net
193.141.20.34	PTR	undelegated-pi.de.kpn-eurorings.net
193.141.21.0	PTR	193-141-21-0.biz.kpn.net
193.141.21.10	PTR	unused-static-pa.de.kpn-eurorings.net
193.141.21.41	PTR	unused-static-pa.de.kpn-eurorings.net
193.141.21.59	PTR	unused-static-pa.de.kpn-eurorings.net
193.141.21.163	PTR	unused-static-pa.de.kpn-eurorings.net
193.141.21.217	PTR	unused-static-pa.de.kpn-eurorings.net
193.141.21.224	PTR	unused-static-pa.de.kpn-eurorings.net
193.141.21.227	PTR	unused-static-pa.de.kpn-eurorings.net
193.141.21.232	PTR	unused-static-pa.de.kpn-eurorings.net
193.141.22.49	PTR	unused-static-pa.de.kpn-eurorings.net
193.141.22.121	PTR	unused-static-pa.de.kpn-eurorings.net
193.141.22.185	PTR	unused-static-pa.de.kpn-eurorings.net
193.141.22.225	PTR	unused-static-pa.de.kpn-eurorings.net