Robtex

Up: 85.22.54.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 85.22.55.0/25
Down right: 85.22.55.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
85.22.55.20	A+PTR	imap-test.dokom.net
85.22.55.20	A+PTR	pop3.dokom.net
85.22.55.20	A+PTR	pop3-test.dokom.net
85.22.55.23	A+PTR	mailout1.dokom.net
85.22.55.30	A+PTR	smtp-test.dokom.net
85.22.55.30	A+PTR	smtp.dokom.net
85.22.55.40	PTR	mailin-test.dokom.net
85.22.55.40	A+PTR	mailin.dokom.net
85.22.55.40	A+PTR	mx.dokom.net
85.22.55.47	A+PTR	www.dokom21-webagent.de
85.22.55.47	A	webagent.dokom21.de
85.22.55.47	A	dokom21-webagent.de
85.22.55.255	PTR	85-22-55-255.ip.dokom21.de