Robtex

Up: 74.6.224.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 74.6.228.0/23
Down right: 74.6.230.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
74.6.228.39	PTR	unknown-74-6-228-x.yahoo.com
74.6.228.71	A+PTR	vcs-s-myc.mail.vip.ac4.yahoo.com
74.6.228.83	PTR	unknown-74-6-228-x.yahoo.com
74.6.228.93	PTR	unknown-74-6-228-x.yahoo.com
74.6.228.136	A+PTR	o1.ycpi.vip.ne1.yahoo.com
74.6.228.136	A	ds-ycpi-data.xobni.g01.yahoodns.net
74.6.228.136	A	ds-geoycpi-uno-lite.gycpi.b.yahoodns.net
74.6.228.137	A+PTR	o2.ycpi.vip.ne1.yahoo.com
74.6.228.137	A	ds-ycpi-data.xobni.g01.yahoodns.net
74.6.228.137	A	ds-geoycpi-uno-lite.gycpi.b.yahoodns.net
74.6.228.138	PTR	proxy1.att.vip.ne1.yahoo.com
74.6.228.139	PTR	media-router-fp1.prod.media.vip.ne1.yahoo.com
74.6.228.140	A+PTR	media-router-fp1.canary.media.vip.ne1.yahoo.com
74.6.228.141	PTR	unknown-74-6-228-x.yahoo.com
74.6.228.141	A	stg-api-v3.pbp.vip.ne1.yahoo.com
74.6.229.28	A+PTR	sky200-aol-pri.mail.vip.ne1.yahoo.com
74.6.229.30	A	test1-imap.mail.vip.ne1.yahoo.com
74.6.230.106	PTR	unknown-74-6-230-x.yahoo.com
74.6.230.106	A	beap-aik2.adx.ysm.yahoodns.net
74.6.230.107	PTR	unknown-74-6-230-x.yahoo.com
74.6.230.107	A	beapav.bc.gysm.yahoodns.net
74.6.231.8	PTR	yws08.blb.ah.ac4.yahoo.com
74.6.231.8	A	any-ds-comet.yahoo.a01.yahoodns.net
74.6.231.8	A	public1.comet.vip.ne1.yahoo.com
74.6.231.10	PTR	media-router-ui71.canary.media.vip.ne1.yahoo.com
74.6.231.10	A	mpr2.ngd.vip.ne1.yahoo.com
74.6.231.14	A+PTR	media-router-ui71.prod.media.vip.ne1.yahoo.com
74.6.231.14	A	yho.com
74.6.231.14	A	yahoo.co.uk
74.6.231.16	PTR	media-router-ui73.prod.media.vip.ne1.yahoo.com
74.6.231.17	PTR	yws12.blb.ah.ac4.yahoo.com
74.6.231.18	A+PTR	media-router-api71.prod.media.vip.ne1.yahoo.com
74.6.231.20	PTR	media-router-fp73.prod.media.vip.ne1.yahoo.com
74.6.231.20	A	yahoo.com
74.6.231.20	A	atsv2-fp.wg1.b.yahoo.com
74.6.231.21	PTR	media-router-fp74.prod.media.vip.ne1.yahoo.com
74.6.231.21	A	yahoo.com
74.6.231.21	A	atsv2-fp.wg1.b.yahoo.com