Robtex

Up: 83.243.72.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 83.243.76.0/23
Down right: 83.243.78.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
83.243.76.9	PTR	bbn-ms-gw.nodex.net.ru
83.243.76.18	PTR	roman.spb.ru
83.243.76.21	PTR	bbn-ms-gw.nodex.net.ru
83.243.76.26	A	mail11.stals62.ru
83.243.76.45	PTR	bbn-ms-gw.nodex.net.ru
83.243.76.53	PTR	push-bbn-gw.nodex.net.ru
83.243.76.54	A+PTR	ns3.nodex.ru
83.243.76.58	PTR	eng139-gw.nodex.net.ru
83.243.76.58	A	point-it.ru
83.243.76.85	PTR	6line-hotel.nodex.ru
83.243.76.90	A	ukki-dom.ru
83.243.76.90	A	land812.ru
83.243.76.98	PTR	softrex.com
83.243.76.98	A	mik-test.ru
83.243.76.113	PTR	bbn-ms-gw.nodex.net.ru
83.243.76.142	A	ns1.nodex.ru
83.243.76.158	PTR	colo1.wpi.ru
83.243.76.166	PTR	trenhost.spb.ru
83.243.76.166	A	paradroz.spb.ru
83.243.76.166	A	ns1.trenhost.spb.ru
83.243.76.186	A+PTR	main2.conros.ru
83.243.76.186	A	auctionconros.ru
83.243.76.186	A	petac.ru
83.243.76.246	A	businessexpedition.com
83.243.76.246	A	mail.businessexpedition.com
83.243.76.246	A	mail.business-expedition.com
83.243.76.254	PTR	5.3ghz-nevsky63-gw.nodex.net.ru
83.243.78.2	PTR	h1.hosting.nodex.ru
83.243.78.2	A	city.tulanet.ru
83.243.78.2	A	smtp.mail.gtk.su
83.243.78.4	PTR	energoprj.ru
83.243.78.4	A	mail.energoprj.ru
83.243.78.5	A+PTR	ramvr.ru
83.243.78.5	A	mail.ramvr.ru
83.243.78.5	A	www.ramvr.ru
83.243.78.6	PTR	h3.hosting.nodex.ru
83.243.78.8	A	nodex.ru
83.243.78.9	A	ctlan.ru
83.243.78.66	A+PTR	ns2.hosting.nodex.ru
83.243.78.66	A	ns2.cl.nodex.ru
83.243.78.66	A	users2.t4.ru
83.243.78.68	A	ns3.greenlabs.ru
83.243.78.68	A	ns3.spbnet.ru
83.243.78.69	PTR	nsx3.infor.spb.ru
83.243.78.69	A	nsx3.infor.net.ru
83.243.78.69	A	xns3.infor.spb.ru