Robtex

Up: 81.167.36.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 81.167.36.0/25
Down right: 81.167.36.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.167.36.0	PTR	81.167.36.0.static.lyse.net
81.167.36.1	PTR	81.167.36.1.static.lyse.net
81.167.36.3	PTR	ns1isp.mro.lyse.net
81.167.36.4	A+PTR	ns1.lyse.net
81.167.36.4	A	ns1.altibox.net
81.167.36.5	PTR	ns1ispdk.altibox.net
81.167.36.11	PTR	ns2isp.ulh.lyse.net
81.167.36.12	PTR	ns2ispdk.altibox.net
81.167.36.13	A+PTR	ns2.lyse.net
81.167.36.34	A+PTR	portal2.ulh.lyse.net
81.167.36.34	A	portal2.lyse.net
81.167.36.38	A	solborg.info
81.167.36.40	A+PTR	wiki1.lyse.net
81.167.36.42	PTR	81.167.36.42.static.lyse.net
81.167.36.42	A	tv.altibox.no
81.167.36.42	A	webgarden1.lyse.net
81.167.36.74	PTR	81.167.36.74.static.lyse.net
81.167.36.145	A	scontent.fsvg2-1.fna.fbcdn.net
81.167.36.146	A	video.fsvg2-1.fna.fbcdn.net
81.167.36.147	PTR
81.167.36.149	PTR	asav2.lyse.net
81.167.36.150	PTR
81.167.36.151	PTR
81.167.36.153	PTR
81.167.36.161	A	instagram.fsvg2-1.fna.fbcdn.net
81.167.36.165	PTR	81.167.36.165.static.lyse.net
81.167.36.165	A	ishome.no
81.167.36.165	A	is-home.no
81.167.36.168	PTR	81.167.36.168.static.lyse.net
81.167.36.168	A	portal.lyse.net
81.167.36.168	A	www.fredfiber.net
81.167.36.169	PTR	81.167.36.169.static.lyse.net
81.167.36.169	A	portal.lyse.net
81.167.36.169	A	www.fredfiber.net
81.167.36.173	PTR	81.167.36.173.static.lyse.net
81.167.36.173	A	medarbejderfiber.dk
81.167.36.173	A	altibox.net
81.167.36.183	A	cms.altibox.no
81.167.36.184	PTR	81.167.36.184.static.lyse.net
81.167.36.184	A	mail.altibox.se
81.167.36.184	A	www.altibox.se
81.167.36.190	PTR	81.167.36.190.static.lyse.net
81.167.36.190	A	home.ebnett.no
81.167.36.190	A	home.bkkfiber.no
81.167.36.195	PTR	81.167.36.195.static.lyse.net
81.167.36.209	PTR	81.167.36.209.static.lyse.net
81.167.36.209	A	scontent.fsvg1-1.fna.fbcdn.net
81.167.36.209	A	external.fsvg1-1.fna.fbcdn.net
81.167.36.210	PTR	81.167.36.210.static.lyse.net
81.167.36.210	A	video.fsvg1-1.fna.fbcdn.net
81.167.36.224	PTR	81.167.36.224.static.lyse.net
81.167.36.224	A	instagram.fsvg1-1.fna.fbcdn.net
81.167.36.241	PTR	81.167.36.241.static.lyse.net