Robtex

Up: 193.141.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 193.141.48.0/23
Down right: 193.141.50.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
193.141.48.0	PTR	static.kpn.net
193.141.48.29	PTR	static.kpn.net
193.141.48.79	PTR	static.kpn.net
193.141.48.82	PTR	static.kpn.net
193.141.48.105	PTR	static.kpn.net
193.141.48.132	PTR	static.kpn.net
193.141.48.148	PTR	mail.cosolo.nl
193.141.48.150	PTR	static.kpn.net
193.141.48.180	PTR	static.kpn.net
193.141.48.191	PTR	static.kpn.net
193.141.49.26	PTR	static.kpn.net
193.141.49.26	A	secufone.de
193.141.49.26	A	mail.secufone.de
193.141.49.87	PTR	static.kpn.net
193.141.50.2	PTR	static.kpn.net
193.141.50.16	PTR	static.kpn.net
193.141.50.19	A+PTR	mail.ubbinkgarden.com
193.141.50.19	A	mail2.ubbinkgarden.com
193.141.50.19	A	mail.outsideliving.com
193.141.50.20	PTR	static.kpn.net
193.141.50.20	A	www.ubbinkgarden.com
193.141.50.20	A	ubbinkgarden.com
193.141.50.40	PTR	static.kpn.net
193.141.50.60	PTR	static.kpn.net
193.141.50.79	PTR	static.kpn.net
193.141.50.94	PTR	static.kpn.net
193.141.50.108	PTR	static.kpn.net
193.141.50.175	PTR	static.kpn.net
193.141.50.183	PTR	static.kpn.net
193.141.50.184	PTR	static.kpn.net
193.141.50.190	PTR	static.kpn.net
193.141.50.192	PTR	static.kpn.net
193.141.50.197	PTR	static.kpn.net
193.141.50.216	PTR	static.kpn.net
193.141.50.251	PTR	static.kpn.net
193.141.51.16	PTR	static.kpn.net
193.141.51.48	PTR	static.kpn.net
193.141.51.96	PTR	static.kpn.net
193.141.51.168	PTR	static.kpn.net
193.141.51.191	PTR	static.kpn.net