Robtex

Up: 185.154.20.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 185.154.21.0/25
Down right: 185.154.21.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
185.154.21.12	PTR	server.ds
185.154.21.12	A	onlineigry.net
185.154.21.12	A	igrodom.su
185.154.21.16	PTR	emtec2.if.example.com
185.154.21.16	A	webkisschoco.com
185.154.21.17	PTR	185.154.21.17
185.154.21.17	A	khudyakov.org
185.154.21.21	A+PTR	mail.dermo-cosmetique.ru
185.154.21.21	A	www.dermo-cosmetique.ru
185.154.21.21	A	dermo-cosmetique.ru
185.154.21.43	A+PTR	dragunov.me
185.154.21.83	PTR	nd.ru
185.154.21.83	A	prokolushey.com.ua
185.154.21.86	A	xn----9sbbd7alubeu5fvbh.xn--p1ai
185.154.21.106	PTR	4ll.ru
185.154.21.106	A	www.eugendoga.com
185.154.21.106	A	art-inschool.ru
185.154.21.107	PTR	server.ds
185.154.21.120	PTR	jessy21.com
185.154.21.120	A	filmohits.ru
185.154.21.120	A	erenkova.ru
185.154.21.129	PTR	web-kuznec.ru
185.154.21.131	PTR	kaminy-almadore.ru
185.154.21.131	A	pechi-nordica.ru
185.154.21.131	A	www.pechi-nordica.ru
185.154.21.138	PTR	boxbfp1.example.com
185.154.21.138	A	mail.seo-web.ru
185.154.21.138	A	mail.psihoanalis.ru
185.154.21.160	PTR	santropesko.example.com
185.154.21.171	PTR	free.example.com
185.154.21.171	A	vrt.rreer.com
185.154.21.183	PTR	manads.ru
185.154.21.183	A	mail.seksizle.ru
185.154.21.183	A	penal24.com
185.154.21.184	PTR	manads.ru
185.154.21.184	A	penal24.com
185.154.21.184	A	mail.penal24.com
185.154.21.193	PTR	stoke.ru
185.154.21.193	A	www.best-rassilka.ru
185.154.21.193	A	ns4.vardenhost.ru
185.154.21.208	A	ssl.admin.itybuy.it
185.154.21.214	A+PTR	xxxfallout.com
185.154.21.214	A	mail.xxxfallout.com