Robtex

Up: 199.15.136.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 199.15.136.0/25
Down right: 199.15.136.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
199.15.136.2	A+PTR	borocfw01.riss.net
199.15.136.4	A+PTR	suite.riss.net
199.15.136.5	A	rtscns01.riss.net
199.15.136.8	A+PTR	rpe.riss.net
199.15.136.9	PTR	mailsync.riss.net
199.15.136.12	A+PTR	hidtalink.hidta.net
199.15.136.13	A+PTR	rln.riss.net
199.15.136.16	PTR	adfs.riss.net
199.15.136.24	PTR	mobilecas.riss.net
199.15.136.25	A+PTR	nespinexchange.riss.net
199.15.136.26	PTR	mocicsync.riss.net
199.15.136.27	PTR	rminsync.riss.net
199.15.136.30	PTR	rociccas.riss.net
199.15.136.31	PTR	nespincas.riss.net
199.15.136.32	PTR	rmincas.riss.net
199.15.136.33	PTR	magloclenln.riss.net
199.15.136.34	A+PTR	autodiscover.riss.net
199.15.136.34	A+PTR	magloclencas.riss.net
199.15.136.34	A+PTR	mail.riss.net
199.15.136.35	A+PTR	mociccas.riss.net
199.15.136.36	PTR	federate.riss.net
199.15.136.38	PTR	dataexchangetest.riss.net
199.15.136.39	PTR	testlogon.riss.net
199.15.136.41	A+PTR	atixolr.riss.net
199.15.136.64	A+PTR	meet.riss.net
199.15.136.66	A	wc.riss.net
199.15.136.67	A+PTR	av.riss.net
199.15.136.68	PTR	dirpool01.riss.net
199.15.136.68	PTR	lyncdiscover.riss.net
199.15.136.68	PTR	lyncdiscover.risstech.riss.net
199.15.136.75	PTR	rocicws.riss.net
199.15.136.75	A+PTR	rminlp.riss.net
199.15.136.75	PTR	rocicapps.riss.net
199.15.136.116	PTR	cjis.riss.net
199.15.136.116	PTR	extranet.riss.net
199.15.136.116	PTR	fletc.riss.net
199.15.136.119	PTR	wsinln.riss.net
199.15.136.120	A	wsin.rissinfo.com
199.15.136.120	A	rmin.rissinfo.com
199.15.136.120	A	magloclen.rissinfo.com
199.15.136.121	PTR	new.riss.net
199.15.136.128	A+PTR	test.riss.net
199.15.136.155	PTR	adadmin.rc.riss.net
199.15.136.155	A+PTR	m.rc.riss.net
199.15.136.155	A+PTR	rissafe.rc.riss.net