Robtex

Up: 185.123.226.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 185.123.226.0/25
Down right: 185.123.226.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
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