Robtex

Up: 58.137.152.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 58.137.156.0/23
Down right: 58.137.158.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
58.137.157.17	A	mail.teleinfomedia.net
58.137.157.130	A	mbakku.com
58.137.157.148	A	mail03.pearlenergy.com
58.137.157.149	A	th.mail.mubadalapetroleum.com
58.137.157.169	A	dec-exp.com
58.137.157.169	A	exchange.decseatec.com
58.137.157.169	A	decseatec.com
58.137.157.170	PTR	exchange.decseatec.com
58.137.157.170	PTR	mail.seatec.co.th
58.137.157.178	A	www.nomjittpcl.co.th
58.137.157.178	A	bd.nmarkplaza.com
58.137.157.178	A	elysiumbangkok.com
58.137.157.180	A	activity.nmarkplaza.com
58.137.157.190	A	it.nmarkplaza.com
58.137.157.211	A	mail1.ramasiam.com
58.137.157.212	A+PTR	mail2.ramasiam.com
58.137.157.215	A	mail2.inno-center.com
58.137.157.250	PTR	mail.sithiphorn.com
58.137.158.51	A	dmsboost.net
58.137.158.98	PTR	mail2.patayafood.com
58.137.158.102	A+PTR	mail2.patayafood.com
58.137.158.194	A+PTR	mailserver.stecon.co.th
58.137.158.195	A+PTR	mail.opt.stecon.co.th
58.137.158.195	A	opt.stecon.co.th
58.137.158.196	A	sthq20.stecon.co.th
58.137.158.203	A+PTR	sthq28.opt.stecon.co.th
58.137.158.203	A	mail.htr.co.th
58.137.158.209	A+PTR	mail01.stecon.co.th
58.137.158.210	A	mail.stecon.co.th
58.137.159.20	PTR	mx1.ktzmico.com
58.137.159.20	A	outbound1.ktzmico.com
58.137.159.20	A	outbound2.ktzmico.com
58.137.159.21	PTR	mx1.seamico.co.th
58.137.159.49	A	www.seamico.com
58.137.159.70	A	www.ktzresearch.com
58.137.159.79	A	www.ktzmico.com
58.137.159.80	A	webmail.ktzmico.com
58.137.159.105	A	ios.ktzmico.com
58.137.159.123	A	ns01.ktzmico.com
58.137.159.124	A	ns02.ktzmico.com
58.137.159.140	A	mx1.ktz-eservices.com
58.137.159.178	A+PTR	media.ktzmico.com