Robtex

Up: 81.5.128.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 81.5.192.0/19
Down right: 81.5.224.0/19
(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	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
81.5.224.33	PTR	81-5-224-33.hdsl.highway.telekom.at
81.5.224.33	A	mail.deinhausverwalter.at
81.5.224.33	A	mail.gebaeudeverwaltung.at
81.5.225.38	A+PTR	81-5-225-38.hdsl.highway.telekom.at
81.5.226.18	PTR	81-5-226-18.hdsl.highway.telekom.at
81.5.226.18	A	gateway.rossmanith.at
81.5.226.98	A+PTR	81-5-226-98.hdsl.highway.telekom.at
81.5.226.98	A	hochdruck.at
81.5.226.98	A	mail.hochdruck.at
81.5.231.82	A+PTR	81-5-231-82.hdsl.highway.telekom.at
81.5.231.82	A	kasel.com
81.5.231.82	A	vitaplus.bio
81.5.233.61	A+PTR	81-5-233-61.hdsl.highway.telekom.at
81.5.240.119	A+PTR	81-5-240-119.hdsl.highway.telekom.at
81.5.240.201	A+PTR	81-5-240-201.hdsl.highway.telekom.at
81.5.240.201	A	www.hauseingang.duckdns.org
81.5.240.201	A	hauseingang.duckdns.org
81.5.242.214	PTR	81-5-242-214.hdsl.highway.telekom.at
81.5.243.80	A+PTR	81-5-243-80.hdsl.highway.telekom.at
81.5.247.61	PTR	81-5-247-61.hdsl.highway.telekom.at
81.5.250.44	A	81-5-250-44.hdsl.highway.telekom.at
81.5.250.231	A+PTR	81-5-250-231.hdsl.highway.telekom.at
81.5.250.231	A	remote.rockenschaub-gutau.at
81.5.251.149	A+PTR	81-5-251-149.hdsl.highway.telekom.at
81.5.251.149	A	freggles.duckdns.org
81.5.251.238	A+PTR	81-5-251-238.hdsl.highway.telekom.at
81.5.252.32	A+PTR	81-5-252-32.hdsl.highway.telekom.at
81.5.255.0	A+PTR	81-5-255-0.hdsl.highway.telekom.at
81.5.255.255	PTR	81-5-255-255.hdsl.highway.telekom.at