Robtex

Up: 175.123.16.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 175.123.17.0/25
Down right: 175.123.17.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
175.123.17.5	A+PTR	mail.seoultp.or.kr
175.123.17.6	A	mail.shinhwatp.co.kr
175.123.17.13	A+PTR	mail.iksung.net
175.123.17.18	A+PTR	mail.woojochem.co.kr
175.123.17.18	A	gw.woojohightech.com
175.123.17.25	PTR	gjfac.or.kr
175.123.17.25	A	mail.gjfac.or.kr
175.123.17.26	A	mail.heemangfdn.or.kr
175.123.17.37	PTR	mail.kangstem.com
175.123.17.42	PTR	mail.kangstem.com
175.123.17.42	A	kangstem.com
175.123.17.46	PTR	jcaf.or.kr
175.123.17.46	PTR	jfac.kr
175.123.17.46	A	mail.jcaf.or.kr
175.123.17.51	A	luk-order.com
175.123.17.54	A+PTR	mail.bistos.co.kr
175.123.17.54	PTR	bistos.co.kr
175.123.17.59	A	mail.gfn.or.kr
175.123.17.85	A+PTR	mail.sevenstarworks.com
175.123.17.86	A+PTR	mail.kalia.or.kr
175.123.17.90	A	mail.komount.kr
175.123.17.99	A	mail.dyik21.co.kr
175.123.17.107	PTR	spamout.koia.or.kr
175.123.17.107	A	mail.djg.co.kr
175.123.17.117	A	mail.emc-env.com
175.123.17.121	A	mail.fortix.me
175.123.17.137	A	mail.ydgls.com
175.123.17.142	PTR	mail.himh.co.kr
175.123.17.142	A	gw.himh.re.kr
175.123.17.147	PTR	foodinfo.or.kr
175.123.17.147	A	mail.foodinfo.or.kr
175.123.17.151	A+PTR	mail.conveyor.co.kr
175.123.17.151	A+PTR	mail.hcchain.co.kr
175.123.17.151	PTR	conveyor.co.kr
175.123.17.156	PTR	actcos.com
175.123.17.156	A	emtech1.com
175.123.17.156	A	mail.actcos.com
175.123.17.158	A	mail.gujutec.co.kr
175.123.17.161	PTR	gimc.or.kr
175.123.17.161	A	gw.gimc.or.kr
175.123.17.161	A	gw.gimc.kr
175.123.17.167	PTR	jennyhouse.co.kr
175.123.17.167	A	mail.jennyhouse.co.kr
175.123.17.172	A	mail.everon.co.kr
175.123.17.173	PTR	sida.kr
175.123.17.173	A	mail.sida.kr
175.123.17.188	PTR	ccei.kr
175.123.17.188	A	mail.ccei.kr
175.123.17.198	PTR	realyagu.com
175.123.17.198	A	mail.realyagu.com
175.123.17.216	A+PTR	mail.1894.or.kr
175.123.17.220	A+PTR	mail.kbs-mt.com
175.123.17.225	A+PTR	mail.phcf.or.kr
175.123.17.242	A	mail.cosmoecochem.co.kr