Robtex

Up: 81.3.16.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 81.3.17.0/25
Down right: 81.3.17.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.3.17.7	A	lingvaeterna.nl
81.3.17.7	A	lingva-eterna.nl
81.3.17.7	A	lingva-eterna.it
81.3.17.11	PTR	confluence0756.saas.haj1.smhss.de
81.3.17.132	A	thomas-kiemle.de
81.3.17.132	A	mail.thomas-kiemle.de
81.3.17.135	A	mail.my-visacard.com
81.3.17.157	A	rupprecht-wiki.eu
81.3.17.159	A	mail.stefanhutzenlaub.de
81.3.17.159	A	mail.quantachrome.de
81.3.17.183	A	server145-han.de-nserver.de
81.3.17.192	A	formmed-shop.de
81.3.17.203	A	mail.anadea.de
81.3.17.203	A	anadea.de
81.3.17.203	A	*.anadea.net
81.3.17.220	A	mail.datensprung.eu
81.3.17.220	A	datensprung.eu