Robtex

Up: 81.3.128.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 81.3.192.0/19
Down right: 81.3.224.0/19
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.3.192.0	A+PTR	81.3.192.0.wireless.dyn.drei.com
81.3.201.76	A	r1.sn-uigxx50n-8pxz.googlevideo.com
81.3.201.76	A	r1.sn-uigxx50n-8pxz.gvt1.com
81.3.201.76	A	r1---sn-uigxx50n-8pxz.googlevideo.com
81.3.201.77	A	r2.sn-uigxx50n-8pxz.gvt1.com
81.3.201.145	A	scontent.fvie2-1.fna.fbcdn.net
81.3.201.146	A	video.fvie2-1.fna.fbcdn.net
81.3.201.161	A	instagram.fvie2-1.fna.fbcdn.net
81.3.201.162	A	media.fvie2-1.fna.whatsapp.net
81.3.201.194	PTR	gprs194-201.business.one.at
81.3.201.194	A	occ-2-1054-1489.1.nflxso.net
81.3.201.194	A	occ-0-1054-1490.1.nflxso.net
81.3.201.203	A	occ-1-1054-1489.1.nflxso.net
81.3.201.203	A	occ-1-1054-1490.1.nflxso.net
81.3.201.218	A	occ-1-1054-1489.1.nflxso.net
81.3.201.218	A	occ-1-1054-1490.1.nflxso.net
81.3.214.192	A	081-003-214-192.yesss.at
81.3.214.193	A	081-003-214-193.yesss.at
81.3.214.194	A	081-003-214-194.yesss.at
81.3.214.195	A	081-003-214-195.yesss.at
81.3.215.6	A	acerola2.orange.co.at
81.3.219.1	PTR	081-003-219-001.dyn.orange.at
81.3.220.4	A	onewbx1p.orange.at
81.3.224.0	PTR	81.3.224.0.wireless.dyn.drei.com
81.3.230.115	A	81.3.230.115.wireless.dyn.drei.com
81.3.232.0	A+PTR	81.3.232.0.wireless.dyn.drei.com
81.3.232.62	A	81.3.232.62.wireless.dyn.drei.com
81.3.233.217	A	81.3.233.217.wireless.dyn.drei.com
81.3.235.248	A	81.3.235.248.wireless.dyn.drei.com
81.3.237.1	PTR	081-003-237-001.dyn.orange.at
81.3.238.109	A	81.3.238.109.wireless.dyn.drei.com
81.3.240.0	PTR	081-003-240-000.dyn.orange.at
81.3.241.146	A	81.3.241.146.wireless.dyn.drei.com
81.3.242.252	A	81.3.242.252.wireless.dyn.drei.com
81.3.244.1	PTR	081-003-244-001.dyn.orange.at
81.3.244.16	A	081-003-244-016.dyn.orange.at
81.3.244.46	A	81.3.244.46.wireless.dyn.drei.com
81.3.245.126	A	81.3.245.126.wireless.dyn.drei.com
81.3.246.1	PTR	081-003-246-001.dyn.orange.at
81.3.246.41	A	81.3.246.41.wireless.dyn.drei.com
81.3.246.245	A	081-003-246-245.dyn.orange.at
81.3.246.245	A	81.3.246.245.wireless.dyn.drei.com
81.3.247.255	A	81.3.247.255.wireless.dyn.drei.com
81.3.248.0	PTR	81.3.248.0.wireless.dyn.drei.com
81.3.248.74	A	81.3.248.74.wireless.dyn.drei.com
81.3.250.3	PTR	081-003-250-003.dyn.orange.at
81.3.252.231	A	081-003-252-231.dyn.orange.at
81.3.253.142	A	081-003-253-142.dyn.orange.at
81.3.255.70	A	81.3.255.70.wireless.dyn.drei.com