Robtex

Up: 185.123.224.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 185.123.224.0/23
Down right: 185.123.226.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
185.123.224.0	PTR	network-185.123.224.0-24.fra1.avira.net
185.123.224.28	A	ns2.avira-ns.de
185.123.224.28	A	ns10.avira-ns.de
185.123.224.253	PTR	professional.de.avira-update.com
185.123.224.253	A	profpeak.update.avira.com
185.123.224.253	A	professional.avira-update.net
185.123.224.254	PTR	professional.de.avira-update.com
185.123.224.254	A	profpeak.update.avira.com
185.123.224.254	A	professional.avira-update.net
185.123.225.4	A	vcc2.avira.com
185.123.225.4	A	vcc.avira.com
185.123.225.5	A	mute.avira.com
185.123.225.6	A	analysis.avira.com
185.123.225.8	A	lcheck.avira.com
185.123.225.9	A	virex.avira.com
185.123.225.10	A	submit.avira.com
185.123.226.253	PTR	professional.de.avira-update.com
185.123.226.253	A	profpeak.update.avira.com
185.123.226.253	A	professional.avira-update.net
185.123.226.254	PTR	professional.de.avira-update.com
185.123.226.254	A	profpeak.update.avira.com
185.123.226.254	A	professional.avira-update.net
185.123.227.2	A	gms-out-01.srv.fra1.avira.net
185.123.227.3	A	gms-out-02.srv.fra1.avira.net
185.123.227.4	A+PTR	infra-relay.fra1.avira.net
185.123.227.5	A+PTR	mx01.fra1.avira.net
185.123.227.5	A	b.mx.avira.com
185.123.227.8	A+PTR	fulbright.srv.fra1.avira.net
185.123.227.9	PTR	gmailing-old.avira.com
185.123.227.10	PTR	hippo.srv.fra1.avira.net
185.123.227.10	A	avira-pua-test-domain.com
185.123.227.10	A	avira-auc-test-domain.com
185.123.227.11	A+PTR	logbox.srv.fra1.avira.net
185.123.227.12	A+PTR	notif1.avira.com
185.123.227.12	A	icm.avira.com
185.123.227.12	A	ipm.avira.com
185.123.227.13	A	icm.avira.com
185.123.227.13	A	ipm.avira.com
185.123.227.13	A	notifier.avira.com
185.123.227.19	A	vpn.fra1.avira.net
185.123.227.20	PTR	gmailing-old.avira.com
185.123.227.20	A	gms-out-04.srv.fra1.avira.net
185.123.227.22	PTR	hippo.srv.fra1.avira.net
185.123.227.22	A	avira-whitelist-test-domain.com
185.123.227.23	A+PTR	pootle.srv.fra1.avira.net
185.123.227.23	A	translate.avira.com
185.123.227.24	A+PTR	hipchat.fra1.avira.net
185.123.227.24	A	hipchat.avira.com
185.123.227.255	PTR	broadcast-185.123.227.0-24.fra1.avira.net