Robtex

Up: 81.5.88.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 81.5.88.0/25
Down right: 81.5.88.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.5.88.0	PTR	81.5.88-net.mipt.ru
81.5.88.3	A+PTR	relaydlg-01.paragon-software.com
81.5.88.3	A	dlg-gw.paragon-software.com
81.5.88.4	PTR	pr3.mipt.ru
81.5.88.7	A+PTR	mx.cao-rhms.ru
81.5.88.7	A	www.cao-rhms.ru
81.5.88.7	A	cao-rhms.ru
81.5.88.26	A	aerology.org
81.5.88.53	PTR	orm.mipt.ru
81.5.88.53	A	meteorad.ru
81.5.88.53	A	www.meteorad.ru
81.5.88.57	A+PTR	mail.chemrar.info
81.5.88.62	A+PTR	ofc2.agava.net
81.5.88.63	A+PTR	ofc3.agava.net
81.5.88.64	A	ofc4.agava.net
81.5.88.65	A+PTR	ofc5.agava.net
81.5.88.68	A	komet.mipt.ru
81.5.88.77	A	aerology.org
81.5.88.77	A	www.aerology.org
81.5.88.78	A+PTR	cao-ntcr.mipt.ru
81.5.88.94	A+PTR	cscmsk.chemdiv.com
81.5.88.108	PTR	ineld.mipt.ru
81.5.88.108	A	mx1.inel-display.ru
81.5.88.132	PTR	mx.cao-rhms.ru
81.5.88.132	A	ionosphere.ru
81.5.88.135	A+PTR	mail.gek.ru
81.5.88.135	A	gek.mipt.ru
81.5.88.135	A	office.gek.mipt.ru
81.5.88.136	PTR	farmterra.ru
81.5.88.152	A	handy-safe.ru
81.5.88.160	A	mx10.paragon-software.com
81.5.88.160	A	spline-gw.paragon-software.com
81.5.88.161	A	slovoed.de
81.5.88.161	A	slovoed.net
81.5.88.166	A	www.handwriting-sdk.com
81.5.88.166	A	handwriting-sdk.com
81.5.88.168	A+PTR	gate1.agava.net.ru
81.5.88.169	A+PTR	gate2.agava.net.ru
81.5.88.169	A	m6.paragon-software.com
81.5.88.170	A+PTR	gate3.agava.net.ru
81.5.88.173	A	etb-lab.com
81.5.88.173	A	www.penreader.com
81.5.88.178	A	mail.etb-lab.com
81.5.88.181	A	paragonbox.com
81.5.88.182	A	mx10.paragon-software.com
81.5.88.182	A	ns2.paragon-software.com
81.5.88.185	A	palm-dictionaries.ru
81.5.88.185	A	slovoed.mobi
81.5.88.185	A	handy-weather.ru
81.5.88.188	PTR	dlg2.mail.paragon-software.com