Robtex

Up: 81.24.80.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 81.24.80.0/22
Down right: 81.24.84.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.24.80.226	PTR	ftp.dagtk.net
81.24.80.226	PTR	www.dagtk.net
81.24.80.226	A	opticatelecom.ru
81.24.80.227	A	mail.dagtk.net
81.24.80.229	PTR	ns.dagtk.net
81.24.80.233	PTR	subnet.dagtk.net
81.24.82.71	A	mail.xtreem.ru
81.24.82.71	A	ns.xtreem.ru
81.24.82.71	A	xtreem.ru
81.24.82.117	A	nurik.pro
81.24.83.2	PTR	ns2.dagtk.net
81.24.83.2	A	ns.opticatelecom.ru
81.24.83.39	A	mail.dagtec.ru
81.24.83.129	A	daginfonet.ru
81.24.83.129	A	xn--80agbgo4aah2bq.xn--p1ai
81.24.84.99	PTR	mail.azimut.ru
81.24.84.117	A	*.serverclear.com
81.24.84.117	A	153.serverclear.com
81.24.84.117	A	117.serverclear.com
81.24.84.133	A	risoms.ru
81.24.84.133	A	www.risoms.ru
81.24.84.136	A	www.fomsrd.ru
81.24.84.136	A	fomsrd.ru
81.24.84.210	A+PTR	ns.dagenergo.ru
81.24.85.2	A	net-academy.ru
81.24.85.2	A	wbyezb.com
81.24.86.185	A	fomsrdit.ru