Robtex

Up: 138.19.50.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 138.19.51.0/25
Down right: 138.19.51.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
138.19.51.176	A+PTR	138019051176.ctinets.com
138.19.51.178	A+PTR	138019051178.ctinets.com
138.19.51.178	A	b.armdeokilo.at
138.19.51.178	A	ns4.tzaenmenyti.at
138.19.51.246	A+PTR	138019051246.ctinets.com