Robtex

Up: 81.216.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 81.216.16.0/23
Down right: 81.216.18.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.216.16.0	PTR	81216160-se-kemab.host.songnetworks.se
81.216.16.33	A	812161633-se-kemab.host.songnetworks.se
81.216.16.50	PTR	ordkunskap.se
81.216.16.110	A	8121616110-se-kemab.host.songnetworks.se
81.216.17.27	A+PTR	static-81.216.17.27.addr.tdcsong.se
81.216.17.33	A+PTR	static-81.216.17.33.addr.tdcsong.se
81.216.17.72	A+PTR	static-81.216.17.72.addr.tdcsong.se
81.216.17.75	A+PTR	static-81.216.17.75.addr.tdcsong.se
81.216.17.95	A+PTR	ns.degerfors.se
81.216.17.98	PTR	mail.degerfors.se
81.216.17.99	PTR	static-81.216.17.99.addr.tdcsong.se
81.216.17.100	A+PTR	static-81.216.17.100.addr.tdcsong.se
81.216.17.100	A	degerfors.se
81.216.17.100	A	www.intranet.degerfors.se
81.216.17.111	A+PTR	static-81.216.17.111.addr.tdcsong.se
81.216.17.111	A	mail.degerfors.se
81.216.17.120	A	bsp.degerfors.se
81.216.17.195	PTR	mail.karlskogabredband.se
81.216.17.210	A+PTR	mail.karlskogabredband.se
81.216.17.210	A+PTR	smtp.karlskogabredband.se
81.216.17.231	A+PTR	ratatosk.kmstudio.se
81.216.17.231	A	mail.globalmediatransfer.com
81.216.17.231	A	kmstudio.com
81.216.17.233	A+PTR	static-81.216.17.233.addr.tdcsong.se
81.216.17.235	PTR	ansuz.kmstudio.com
81.216.17.235	A	ansuz.kmstudio.se
81.216.17.235	A	ns2.kmstudio.se
81.216.17.246	A+PTR	smtp.cwr.se
81.216.17.246	A	mail.cwreng.se
81.216.17.250	A+PTR	static-81.216.17.250.addr.tdcsong.se
81.216.17.250	A	mail.cwr.se
81.216.17.255	A	static-81.216.17.255.addr.tdcsong.se