Robtex

Up: 216.52.72.0/24
Can't show all results, try to descend to a more specific CIDR
Down left: 216.52.72.0/26
Down right: 216.52.72.64/26
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.52.72.26	PTR	us3-smtp1.zoho.com
216.52.72.27	PTR	us3-smtp2.zoho.com
216.52.72.28	A+PTR	us3-smtp3.zoho.com
216.52.72.37	A	zs-lc2-ro.zoho.com
216.52.72.39	A	expense-ro.zoho.com
216.52.72.39	A	zs-lc4-ro.zoho.com
216.52.72.40	A	supportlab.zoho.com
216.52.72.41	A	us3-logsapi.zoho.com
216.52.72.42	A	i18nsalesiq.zoho.com
216.52.72.54	PTR	sender1.sdpondemand.com
216.52.72.57	A	wms0.zoho.com
216.52.72.57	A	wms3.zoho.com
216.52.72.57	A	wms2.zoho.com
216.52.72.59	A	mail.embassyattestation.co.in
216.52.72.59	A	mail.forbesganj.net
216.52.72.59	A	mail.homampooja.com
216.52.72.68	A	zc1.tell-your-friend.com
216.52.72.73	A	nastroma.com
216.52.72.73	A	icdis.org
216.52.72.73	A	welaxxx.sk
216.52.72.75	A	wms.zohopublic.com
216.52.72.75	A	wms.site24x7.com
216.52.72.97	A	salesiq.zohopublic.com
216.52.72.97	A	recruit.zohopublic.com
216.52.72.97	A	zpublic.zoho.com
216.52.72.99	A	support.aoshield.com
216.52.72.102	A	workplace.zoho.com
216.52.72.102	A	mail.remakeszone.com
216.52.72.102	A	mail.feltslanding.com
216.52.72.105	A	sheet2app.zoho.com
216.52.72.106	PTR	dispatcher.zohocrm.com
216.52.72.112	PTR	mx.zohocorp.com
216.52.72.117	A	mail.ec-bordados.com.br
216.52.72.120	PTR	smtpin.zoho.com
216.52.72.120	A	mail.hispaniolafruits.com
216.52.72.121	PTR	mx.zoho.com
216.52.72.121	PTR	mx2.zoho.com
216.52.72.121	PTR	mx.zohomail.com
216.52.72.122	PTR	zm-apps2.zoho.com
216.52.72.122	PTR	zm-apps.zoho.com
216.52.72.122	PTR	zm-apps3.zoho.com
216.52.72.123	A	static.zoho.com
216.52.72.123	A	www.zohostatic.com
216.52.72.123	A	css.zohostatic.com
216.52.72.126	A	scripts.zohospotlight.com
216.52.72.126	A	zspotlight.zoho.com