Robtex

Up: 81.5.192.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 81.5.192.0/20
Down right: 81.5.208.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.5.193.50	A+PTR	81-5-193-50.hdsl.highway.telekom.at
81.5.193.50	A	mail.tcwien.com
81.5.193.50	A	tcwien.com
81.5.193.170	A+PTR	81-5-193-170.hdsl.highway.telekom.at
81.5.193.188	A	mail2.bls4law.com
81.5.194.153	A+PTR	81-5-194-153.hdsl.highway.telekom.at
81.5.194.153	A	wixbix.sytes.net
81.5.200.106	A	lausiundgorgiheiraten.at
81.5.200.106	A	mailhost.belaos.at
81.5.200.106	A	mail.lausiundgorgiheiraten.at
81.5.201.97	A+PTR	81-5-201-97.hdsl.highway.telekom.at
81.5.204.8	A+PTR	81-5-204-8.hdsl.highway.telekom.at
81.5.205.85	A+PTR	81-5-205-85.hdsl.highway.telekom.at
81.5.205.85	A	mail.kogleraufzug.com
81.5.205.85	A	mail.kogleraufzug.at
81.5.206.15	PTR	81-5-206-15.hdsl.highway.telekom.at
81.5.206.166	A+PTR	81-5-206-166.hdsl.highway.telekom.at
81.5.206.166	A	fenki.myqnapcloud.com
81.5.210.69	A+PTR	mx1.binderholz.com
81.5.210.69	A	mx1.binderholz.biz
81.5.210.73	A	dns1.binderholz.biz
81.5.210.98	A+PTR	wienextern.deichmann.com
81.5.210.163	A	snt-germany.de
81.5.210.163	A	snt-ccc.com
81.5.210.163	A	*.snt-ccc.com
81.5.210.164	A	home.snt-global.com
81.5.211.2	A	ejigboeaglesclub.org
81.5.211.2	A	mail.ejigboeaglesclub.org
81.5.212.66	A	mail.man-roland.at
81.5.215.2	A	mail.ifpi.at
81.5.215.33	A	ns2.ns1.mail.0043316d91320922aa9bb67676200da6c47044d428473aeb76a4aba3.6.ewsxz.com
81.5.215.59	PTR	mail01.ploberger.co.at
81.5.215.60	A+PTR	mail.ploberger.co.at
81.5.219.204	PTR	smtp1.libro.at
81.5.219.204	A	proxy1.libro.at
81.5.219.214	PTR	smtp2.libro.at
81.5.219.214	A	proxy2.libro.at
81.5.219.237	PTR	smtp.libro.at
81.5.219.237	A	smtp1.libro.at
81.5.219.237	A	smtp2.mth-retailgroup.com