Robtex

Up: 5.159.32.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 5.159.32.0/22
Down right: 5.159.36.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
5.159.32.18	PTR	webmail.con-tech.nl
5.159.32.18	A	mail.con-tech.nl
5.159.32.22	A+PTR	mail.howitec.nl
5.159.32.22	A	mail.howitec.com
5.159.32.26	A+PTR	webmail.pdevries.nl
5.159.32.26	A	fallback.pdevries.nl
5.159.32.30	A+PTR	mail.jelco.nl
5.159.32.30	A	mail.versenco.com
5.159.32.74	A	klantenportaal.harwig.nl
5.159.32.74	A	webshop.harwig.nl
5.159.32.76	A+PTR	exchange.harwig.nl
5.159.32.83	A	mail.snel-ctl.com
5.159.32.83	A	mail.snel-ctl.nl
5.159.32.83	A	mail.westcoastlogistics.info
5.159.32.89	PTR	mail.zinder.org
5.159.32.92	A+PTR	mail.eventrepublic.nl
5.159.32.99	A+PTR	webmail.olijslagerverf.nl
5.159.32.100	A+PTR	services.olijslagerverf.nl
5.159.32.101	A+PTR	mail1.visolity.nl
5.159.32.101	A	mail.olijslagerverf.nl
5.159.32.103	PTR	mail.olijslagerverf.nl
5.159.32.110	A	mijnstucshop.nl
5.159.32.132	A	mail.tademagroep.nl
5.159.32.132	A	mail.tadema.nl
5.159.32.166	A+PTR	remote.asiaexpressfood.nl
5.159.32.178	A	mail.lomans.nl
5.159.32.183	A	www.lomansgroep.nl
5.159.32.194	PTR	mail.kijlstrabetonmortel.nl
5.159.32.202	A+PTR	mail.trimmdesign.com
5.159.32.206	A	mail.aircraftdocking.com
5.159.32.238	A+PTR	mail.fysiophysics.nl
5.159.33.3	PTR	ysg.basicsupplygroup.com
5.159.33.3	A	mail.foodbasics.nl
5.159.33.27	A+PTR	mail.aircraftdocking.com
5.159.33.27	A	mail.nijl.nl
5.159.33.46	A+PTR	mail.alfonsfreriks.com
5.159.33.130	A	asia.jwbakker.eu
5.159.33.132	A	mail.asiaexpressfood.nl
5.159.33.166	A	mail.jelsma-koelma.nl
5.159.33.227	A	mail.cleverexchange.nl
5.159.34.147	A	werkplek.avri.nl
5.159.34.166	A+PTR	mailhost.meewering.nl
5.159.35.18	PTR	mail.kixx-online.nl
5.159.36.2	PTR	firewall.jend.nl
5.159.36.4	A+PTR	mail.jend.nl
5.159.36.4	A	mail.jendleidingsystemen.nl
5.159.36.7	A+PTR	mail.damco.nl
5.159.36.7	PTR	mail.alberco.nl
5.159.36.7	PTR	mail.steensma.com
5.159.37.4	A+PTR	smtp.wevervanwijnen.nl
5.159.37.4	A	smtp.uitgeverijvanwijnen.nl
5.159.37.4	A	mail.wevervanwijnen.nl
5.159.37.135	A	nameserver5.benfmedia.net
5.159.37.136	A	nameserver4.benfmedia.com
5.159.39.48	A	gerwers.nl
5.159.39.138	A	ns02.domino-bc.nl
5.159.39.145	A	vanwieren-vellinga.nl