Robtex

Up: 193.141.136.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 193.141.136.0/23
Down right: 193.141.138.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
193.141.136.194	A+PTR	mail.holapress.com
193.141.136.194	A	mail.vakbeursfacilitair.net
193.141.136.194	A	mail.facilitair.net
193.141.137.10	PTR	static.kpn.net
193.141.137.28	PTR	static.kpn.net
193.141.137.45	PTR	static.kpn.net
193.141.137.51	A	mail.coilservices.com
193.141.137.51	A	mail.pns-services.com
193.141.137.67	PTR	static.kpn.net
193.141.137.77	PTR	static.kpn.net
193.141.137.93	PTR	static.kpn.net
193.141.137.96	PTR	static.kpn.net
193.141.137.97	PTR	static.kpn.net
193.141.137.103	PTR	static.kpn.net
193.141.137.121	PTR	static.kpn.net
193.141.137.128	PTR	static.kpn.net
193.141.137.164	PTR	static.kpn.net
193.141.137.168	PTR	static.kpn.net
193.141.137.169	PTR	static.kpn.net
193.141.137.183	PTR	static.kpn.net
193.141.137.194	PTR	static.kpn.net
193.141.137.205	PTR	static.kpn.net
193.141.137.216	PTR	static.kpn.net
193.141.137.219	PTR	static.kpn.net
193.141.138.42	A	mail.meditech.nl
193.141.138.128	PTR	static.kpn.net
193.141.138.224	PTR	static.kpn.net
193.141.139.1	A+PTR	gateway.hpce.nec.com
193.141.139.8	PTR	ophelia.hpce.nec.com
193.141.139.17	A+PTR	gateway-guest.hpce.nec.com
193.141.139.53	PTR	proxy.hpce.nec.com
193.141.139.200	PTR	sslgate.hpce.nec.com
193.141.139.204	PTR	ssh1.hpce.nec.com
193.141.139.205	PTR	ssh2.hpce.nec.com
193.141.139.206	PTR	sshgate.hpce.nec.com
193.141.139.211	PTR	webmail.hpce.nec.com
193.141.139.212	A+PTR	mail.hpce.nec.com
193.141.139.213	A+PTR	ldap.hpce.nec.com
193.141.139.222	A	proxy.hpce.nec.com
193.141.139.227	A+PTR	ftp.hpce.nec.com
193.141.139.228	PTR	mail01.hpce.nec.com
193.141.139.229	PTR	web01.hpce.nec.com
193.141.139.230	A	www.necd.de
193.141.139.234	PTR	susemirror.hpce.nec.com
193.141.139.235	A+PTR	portal.hpce.nec.com
193.141.139.236	PTR	www02.hpce.nec.com
193.141.139.237	PTR	www.nec.de
193.141.139.237	A	nec.de
193.141.139.238	A	intra.nec.de