Robtex

Up: 210.157.16.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 210.157.17.0/25
Down right: 210.157.17.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
210.157.17.13	A	smtp-gw20.gmo-ms.jp
210.157.17.13	A	smtp-gw20.gmo-media.jp
210.157.17.14	A	smtp-gw14.gmo-ms.jp
210.157.17.14	A	smtp-gw14.gmo-media.jp
210.157.17.21	A+PTR	smtp.gmo-ms.jp
210.157.17.26	A	support.gmo-ms.jp
210.157.17.29	A	c.point.gmo.jp
210.157.17.60	A	delivery.gmo-ms.jp
210.157.17.60	A	secure.freeml.com
210.157.17.62	PTR	web.fukubiki.com
210.157.17.63	PTR	kanri.fukubiki.com
210.157.17.71	PTR	mta-c71.static.gmo-media.jp
210.157.17.72	PTR	mta-c72.static.gmo-media.jp
210.157.17.74	PTR	mta-c74.static.gmo-media.jp
210.157.17.75	PTR	mta-c75.static.gmo-media.jp
210.157.17.76	PTR	mta-c76.static.gmo-media.jp
210.157.17.79	A	fumi2.gmo-media.jp
210.157.17.80	PTR	mta-c80.static.gmo-media.jp
210.157.17.81	PTR	mta-c81.static.gmo-media.jp
210.157.17.82	PTR	mta-c82.static.gmo-media.jp
210.157.17.84	PTR	mta-c84.static.gmo-media.jp
210.157.17.85	PTR	mta-c85.static.gmo-media.jp
210.157.17.87	PTR	mta-c87.static.gmo-media.jp
210.157.17.88	PTR	mta-c88.static.gmo-media.jp
210.157.17.89	PTR	mta-c89.static.gmo-media.jp
210.157.17.90	PTR	mta-c90.static.gmo-media.jp
210.157.17.92	PTR	mta-c92.static.gmo-media.jp
210.157.17.95	PTR	mta-c95.static.gmo-media.jp
210.157.17.98	PTR	mta-c98.static.gmo-media.jp
210.157.17.99	PTR	mta-c99.static.gmo-media.jp
210.157.17.105	PTR	mta-c105.static.gmo-media.jp
210.157.17.109	PTR	mta-c109.static.gmo-media.jp
210.157.17.131	PTR	mta-c131.static.gmo-media.jp
210.157.17.137	PTR	mta-c137.static.gmo-media.jp
210.157.17.140	PTR	mta-c140.static.gmo-media.jp
210.157.17.145	PTR	mta-c145.static.gmo-media.jp
210.157.17.151	PTR	mta-c151.static.gmo-media.jp
210.157.17.154	PTR	mta-c154.static.gmo-media.jp
210.157.17.156	PTR	mta-c156.static.gmo-media.jp
210.157.17.158	PTR	mta-c158.static.gmo-media.jp
210.157.17.159	PTR	mta-c159.static.gmo-media.jp
210.157.17.161	PTR	mta-c161.static.gmo-media.jp
210.157.17.164	PTR	mta-c164.static.gmo-media.jp
210.157.17.167	PTR	mta-c167.static.gmo-media.jp
210.157.17.168	PTR	mta-c168.static.gmo-media.jp
210.157.17.171	A+PTR	mx1.gmo-media.jp
210.157.17.171	A	mail.teacup.com
210.157.17.171	A	mail.tcup.com
210.157.17.172	PTR	mx2.gmo-media.jp
210.157.17.172	A	mail.teacup.com
210.157.17.172	A	mail.tcup.com
210.157.17.173	A	sys-mail1.gmo-media.jp
210.157.17.192	PTR	web2.pokemani.com
210.157.17.194	A	tkyaux.com
210.157.17.196	A	sakube.org
210.157.17.201	A	sp-smtp1.gmo-ms.jp
210.157.17.202	A+PTR	sp-smtp2.gmo-ms.jp
210.157.17.203	A	j1.gmo-ms.jp
210.157.17.221	PTR	mx01.freeml.com
210.157.17.228	A	apdevelop.teacup.com
210.157.17.228	A	gmo-md.jp
210.157.17.228	A	www.gmo-md.jp
210.157.17.229	A	aptest.teacup.com
210.157.17.230	A	test-ap.teacup.com
210.157.17.250	A+PTR	mailtest.gmo-ms.jp