Robtex

Up: 212.29.32.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 212.29.32.0/25
Down right: 212.29.32.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
212.29.32.0	A+PTR	212-29-32-0.ip.dokom21.de
212.29.32.1	PTR	ha-32-1.mk-net.de
212.29.32.161	A+PTR	dns2.dokom21-ns.de
212.29.32.161	A+PTR	dns2.dokom21-ns.eu
212.29.32.161	A+PTR	dns2.dokom.net
212.29.32.255	PTR	212-29-32-255.ip.dokom21.de