Robtex

Up: 185.45.152.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 185.45.152.0/23
Down right: 185.45.154.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
185.45.152.5	PTR	ns2.sipdc.net
185.45.152.9	A	metrotel.info
185.45.152.9	A	ipcloudlp.com
185.45.152.9	A	sip-cloud.net
185.45.152.15	PTR	ns1.sipdc.net
185.45.152.15	A	ns1.rospromsviaz.ru
185.45.152.15	A	ns1.novofon.ru
185.45.152.22	PTR	22.152.45.185.fr.sipdc.net
185.45.152.22	A	stun.zadarma.com
185.45.152.23	A	www.zadarma.com
185.45.152.31	PTR	31.152.45.185.fr.sipdc.net
185.45.152.31	A	novofon.ru
185.45.152.31	A	voice-cloud.es
185.45.152.33	A+PTR	zcrm.cloud
185.45.152.33	A	www.zcrm.cloud
185.45.152.42	A+PTR	n42.fr.sipdc.net
185.45.152.45	A+PTR	zadarma.com
185.45.152.45	A	www.zadarma.com
185.45.152.45	A	wiki.zadarma.com
185.45.152.46	PTR	ss.zadarma.com
185.45.152.52	PTR	52.152.45.185.fr.sipdc.net
185.45.152.52	A	moyip.net
185.45.152.56	A	mx1.sipdc.net
185.45.152.57	A	mx2.sipdc.net
185.45.152.58	PTR	58.152.45.185.fr.sipdc.net
185.45.152.58	A	mx.zadarma.net
185.45.152.58	A	mx.zadarma.ru
185.45.152.59	PTR	59.152.45.185.fr.sipdc.net
185.45.152.131	A+PTR	proxy-3.fr.sipdc.net
185.45.152.161	A	sipfr.zadarma.com
185.45.152.164	A+PTR	pbxbalancer-1.fr.zadarma.com
185.45.152.164	A	pbxfr1.zadarma.com
185.45.152.174	PTR	sipbalancer-2.fr.zadarma.com
185.45.152.174	A	gate03.zadarma.com
185.45.152.174	A	sip.zadarma.com
185.45.152.177	A+PTR	pbxbalancer-2.fr.zadarma.com
185.45.152.177	A	pbxfr2.zadarma.com
185.45.152.177	A	ats.zadarma.com
185.45.152.200	A+PTR	pbxbalancer-3.fr.zadarma.com
185.45.152.200	A	pbxfr3.zadarma.com
185.45.155.14	A+PTR	pbxbalancer-1.ny.zadarma.com
185.45.155.14	A	pbxny1.zadarma.com
185.45.155.17	A	sip.zadarma.com
185.45.155.29	A	zadarma.com