Robtex

Up: 81.5.96.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 81.5.96.0/21
Down right: 81.5.104.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.5.96.0	PTR	81.5.96.0.dhcp.mipt-telecom.ru
81.5.99.21	A+PTR	81.5.99.21.dhcp.mipt-telecom.ru
81.5.99.41	A+PTR	81.5.99.41.dhcp.mipt-telecom.ru
81.5.99.41	A	troe.ru
81.5.100.27	A	81.5.100.27.dhcp.mipt-telecom.ru
81.5.101.147	A+PTR	81.5.101.147.dhcp.mipt-telecom.ru
81.5.101.222	A+PTR	81.5.101.222.dhcp.mipt-telecom.ru
81.5.102.17	PTR	81.5.102.17.dhcp.mipt-telecom.ru
81.5.103.12	A+PTR	smtp.effectsport.ru
81.5.103.191	A+PTR	81.5.103.191.dhcp.mipt-telecom.ru
81.5.103.255	PTR	81.5.103.255.dhcp.mipt-telecom.ru
81.5.104.8	A	ns.mantika.ru
81.5.105.1	PTR	n2-81.5.105.1.mipt-telecom.ru
81.5.105.146	A	81.5.105.146.dhcp.mipt-telecom.ru
81.5.105.159	A	srv.sendor.ru
81.5.105.164	A+PTR	81.5.105.164.dhcp.mipt-telecom.ru
81.5.105.183	A+PTR	81.5.105.183.dhcp.mipt-telecom.ru
81.5.105.203	A	81.5.105.203.dhcp.mipt-telecom.ru
81.5.105.252	PTR	81.5.105.252.dhcp.mipt-telecom.ru
81.5.106.0	A	81.5.106.0.dhcp.mipt-telecom.ru
81.5.106.18	A+PTR	81.5.106.18.dhcp.mipt-telecom.ru
81.5.106.112	A+PTR	81.5.106.112.dhcp.mipt-telecom.ru
81.5.106.218	A+PTR	81.5.106.218.dhcp.mipt-telecom.ru
81.5.107.9	PTR	81.5.107.9.dhcp.mipt-telecom.ru
81.5.107.9	A	gowa.ru
81.5.108.5	A+PTR	81.5.108.5.dhcp.mipt-telecom.ru
81.5.108.5	A	tactik-club.ru
81.5.108.5	A	rez.3c-select.ru
81.5.108.64	A+PTR	81.5.108.64.dhcp.mipt-telecom.ru
81.5.110.6	A	ns1.z-server.ru
81.5.110.6	A	*.z-server.ru
81.5.110.6	A	mail.z-server.ru
81.5.110.8	PTR	81.5.110.8.dhcp.mipt-telecom.ru
81.5.110.19	A	mail.myratov.ru
81.5.110.19	A	valitova.ru
81.5.110.19	A	mail.valitov.ru
81.5.110.30	PTR	81.5.110.30.dhcp.mipt-telecom.ru
81.5.110.112	A+PTR	81.5.110.112.dhcp.mipt-telecom.ru
81.5.110.182	A+PTR	81.5.110.182.dhcp.mipt-telecom.ru
81.5.110.190	PTR	81.5.110.190.dhcp.mipt-telecom.ru
81.5.110.190	A	troe.ru
81.5.111.9	A+PTR	casket.su
81.5.111.9	A	mail.casket.su
81.5.111.9	A	nccom.org
81.5.111.194	A+PTR	81.5.111.194.dhcp.mipt-telecom.ru