Robtex

Up: 212.30.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 212.30.16.0/23
Down right: 212.30.18.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
212.30.16.11	A	galaxyci.com
212.30.16.11	A	matchkit.com
212.30.16.37	PTR	careylanglois.com
212.30.16.37	A+PTR	mail.careygroup.ch
212.30.16.37	PTR	mail.careylanglois.com
212.30.16.45	PTR	mailgate.octagon-online.com
212.30.16.45	PTR	mailgate.octagonbroking.com
212.30.16.45	PTR	mailgate.octagoncover.com
212.30.16.123	A+PTR	owa.havillandmanagement.com
212.30.16.123	A	mail.havilland.co
212.30.16.123	A	mail.havillandmgmt.com
212.30.16.124	A	mx2.mysokar.com
212.30.16.124	A	mx2.havillandmanagement.com
212.30.16.124	A	mailserver.havillandmanagement.com
212.30.16.171	A+PTR	mail.iag.co.gg
212.30.16.203	PTR	mail.heritage.co.gg
212.30.16.203	A+PTR	mail.amber-irm.co.uk
212.30.16.203	A	mail.artexintl.com
212.30.16.251	PTR	network.sure.com
212.30.16.251	A+PTR	mx3.network.sure.com
212.30.16.251	A	mx3.cwgsy.net
212.30.16.252	PTR	ns3.network.sure.com
212.30.16.252	A	ns3.sure.com
212.30.16.252	A	ns3.gtonline.net
212.30.17.35	A	relay.equitytrust.com
212.30.17.86	A	onlyxcasino.com
212.30.17.86	A	rouletteone.com
212.30.17.86	A	spin24casino.com
212.30.17.91	A	mx1.alexandercasino.com
212.30.17.154	A	email2.hsgrp.co.uk
212.30.17.154	A	email.healthspan.co.uk
212.30.17.154	A	email.hsgrp.co.uk
212.30.17.156	PTR	nltest.healthspan.co.uk
212.30.17.171	A	mail.pensionsgsy.com
212.30.17.196	A+PTR	vipmessages.com
212.30.17.196	A	vipmsg.mobi
212.30.17.196	A	media-weaver.net
212.30.17.253	A	socialbetapp.com
212.30.18.64	A	pp-18-64.partypoker.com
212.30.18.71	A+PTR	pp-18-71.partypoker.com
212.30.18.71	A	mx1.idatanet.com
212.30.18.72	A+PTR	mx.idatanet.com
212.30.18.72	A+PTR	pp-18-72.partypoker.com
212.30.18.73	A+PTR	pp-18-73.partypoker.com
212.30.18.77	A	pp-18-77.partypoker.com
212.30.18.80	A+PTR	ns2.partygaming.com
212.30.18.81	A	pp-18-81.partypoker.com
212.30.18.82	PTR	pp-18-82.partypoker.com
212.30.18.82	A	partyacademy.it
212.30.18.82	A	partyacademie.fr
212.30.18.86	A	pp-18-86.partypoker.com
212.30.18.87	A	pp-18-87.partypoker.com
212.30.18.91	A	pp-18-91.partypoker.com
212.30.18.93	A	pp-18-93.partypoker.com
212.30.18.132	A	jetaffiliates.com
212.30.19.4	A	mail.butterfield.gg
212.30.19.5	A	www.butterfieldonline.gg
212.30.19.5	A	butterfieldonline.gg
212.30.19.17	A	remote.butterfield.gg
212.30.19.32	A	*.butterfield.gg
212.30.19.33	A	www.butterfieldonline.co.uk
212.30.19.33	A	butterfieldonline.co.uk
212.30.19.84	A	nat.nerine.com
212.30.19.85	A	mail.nerine.com
212.30.19.134	A+PTR	mx3.ng-it.net
212.30.19.151	A+PTR	galileo.ng-it.net