Robtex

Up: 216.99.128.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 216.99.128.0/21
Down right: 216.99.136.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.99.128.234	A+PTR	con2.trendmicro.com
216.99.129.244	A	nansylzx.com
216.99.130.21	A	email.hiltonmarcoisland.com
216.99.131.0	A	mail.mbtarchitects.com
216.99.131.0	A	mail.unicotechnology.com
216.99.131.0	A	mail.aegir.com
216.99.131.1	A	mx-in01.iad.mail-abuse.org
216.99.131.1	A	in.mx.trendmicro-fail-over.akadns.net
216.99.131.2	PTR	in02.sjc.mx.trendmicro.com
216.99.131.2	A	in.mx.trendmicro-fail-over.akadns.net
216.99.131.3	PTR	in03.sjc.mx.trendmicro.com
216.99.131.3	A	in.mx.trendmicro-fail-over.akadns.net
216.99.131.4	PTR	in04.sjc.mx.trendmicro.com
216.99.131.4	A	in.mx.trendmicro-fail-over.akadns.net
216.99.131.5	A	out.sjc.mx.trendmicro.com
216.99.131.6	A	out.sjc.mx.trendmicro.com
216.99.131.7	A	out.sjc.mx.trendmicro.com
216.99.131.8	A	out.sjc.mx.trendmicro.com
216.99.131.13	A	in.mx.trendmicro-fail-over.akadns.net
216.99.131.14	A	in.mx.trendmicro-fail-over.akadns.net
216.99.131.15	A	in.mx.trendmicro-fail-over.akadns.net
216.99.131.16	PTR	in08.sjc.mx.trendmicro.com
216.99.131.16	A	mail2.excelgrafx.com
216.99.131.16	A	mail3.vaccinate.com.au
216.99.131.17	PTR	in09.sjc.mx.trendmicro.com
216.99.131.17	A	in.mx.trendmicro-fail-over.akadns.net
216.99.131.17	A	mail.sexton.com.au
216.99.131.18	PTR	out05.sjc.mx.trendmicro.com
216.99.131.18	A	out.sjc.mx.trendmicro.com
216.99.131.19	PTR	in11.sjc.mx.trendmicro.com
216.99.131.23	A	out.sjc.mx.trendmicro.com
216.99.131.32	A+PTR	in19.sjc.mx.trendmicro.com
216.99.131.33	PTR	arq13.mail-abuse.com
216.99.131.35	PTR	out06.sjc.mx.trendmicro.com
216.99.131.35	A	out.sjc.mx.trendmicro.com
216.99.131.39	A	in.mx.trendmicro-fail-over.akadns.net
216.99.131.39	A	mail2.inventistechnology.com.au
216.99.131.39	A	mail.champmbo.com
216.99.131.45	A	out.sjc.mx.trendmicro.com
216.99.131.46	A	out.sjc.mx.trendmicro.com
216.99.131.47	A	out.sjc.mx.trendmicro.com
216.99.131.48	A+PTR	out11.sjc.mx.trendmicro.com
216.99.131.48	A	out.sjc.mx.trendmicro.com
216.99.131.49	A+PTR	out12.sjc.mx.trendmicro.com
216.99.131.49	A	out.sjc.mx.trendmicro.com
216.99.131.50	A+PTR	out13.sjc.mx.trendmicro.com
216.99.131.50	A	out.sjc.mx.trendmicro.com
216.99.131.51	PTR	out14.sjc.mx.trendmicro.com
216.99.131.51	A	out.sjc.mx.trendmicro.com
216.99.131.72	PTR	out15.sjc.mx.trendmicro.com
216.99.131.72	A	out.sjc.mx.trendmicro.com
216.99.131.73	A+PTR	out16.sjc.mx.trendmicro.com
216.99.131.73	A	out.sjc.mx.trendmicro.com
216.99.131.74	A+PTR	out17.sjc.mx.trendmicro.com
216.99.131.74	A	out.sjc.mx.trendmicro.com
216.99.131.75	A	out.sjc.mx.trendmicro.com
216.99.131.77	A	out20.sjc.mx.trendmicro.com
216.99.131.78	A	out.sjc.mx.trendmicro.com
216.99.131.79	A	out.sjc.mx.trendmicro.com
216.99.131.83	PTR	relay08.sjc.mx.trendmicro.com
216.99.131.86	A	relay10.sjc.mx.trendmicro.com
216.99.131.91	A	relay03.sjc.mx.trendmicro.com
216.99.131.109	A	ns1.sdi.trendmicro.com
216.99.131.109	A	sdi.trendmicro.com
216.99.131.109	A	imht-salesvm.trendmicro.com
216.99.131.114	PTR	sjdc-wfss1cons.trendidc.net
216.99.131.121	A	hes.trendmicro.com
216.99.131.121	A	mrtg.sjc.mx.trendmicro.com
216.99.131.134	A	ns2.sdi.trendmicro.com
216.99.131.137	A	rvm-2.trendmicro.com
216.99.131.139	A	ers-iplookup.db.trendmicro.com
216.99.131.140	A	qilin-2.trendmicro.com
216.99.131.146	PTR	arqx.trendmicro.com
216.99.131.147	A	arq-log1.trendmicro.com
216.99.131.148	A	arq-log.mail-abuse.com
216.99.131.150	A	db1.db.trendmicro.com
216.99.131.158	A	charon.qa2.securecloud.com
216.99.131.181	A	hjt-data.trendmicro.com
216.99.131.188	A	vdoctor.trendmicro.com
216.99.131.193	A+PTR	sjdc-trialform2.trendmicro.com
216.99.131.194	PTR	sjdc-ers-db6.db.trendmicro.com
216.99.131.194	PTR	tutsi.db.trendmicro.com
216.99.131.197	A+PTR	monit.sjc.mx.trendmicro.com
216.99.131.199	A	zulu.db.trendmicro.com
216.99.131.210	PTR	in.sjc.mx.trendmicro.com
216.99.131.210	A	mail.gohdi.com
216.99.131.210	A	mail1.fmd.com.au
216.99.131.211	PTR	relay.sjc.mx.trendmicro.com
216.99.131.213	PTR	cas.securecloud.com
216.99.131.213	PTR	charon.securecloud.com
216.99.131.213	PTR	w1.securecloud.com
216.99.131.214	PTR	w1.securecloud.com
216.99.131.214	PTR	ers.nssg.trendmicro.com
216.99.132.9	PTR	jp.emailsec.trendmicro.com
216.99.132.9	PTR	us.emailsec.trendmicro.com
216.99.132.9	PTR	jp.imhs.trendmicro.com
216.99.132.106	PTR	oscex-en.nfc.trendmicro.com
216.99.133.18	A	samprm.trendmicro.com
216.99.133.93	A	gcswtest.trendmicro.com
216.99.133.184	A	nabu-tms.trendmicro.com
216.99.134.113	PTR	zdase.trendmicro.com
216.99.142.67	PTR	wfrm.trendmicro.com
216.99.142.67	PTR	wfrm-apac.trendmicro.com
216.99.142.67	PTR	wfrm-lar.trendmicro.com