Robtex

Up: 192.88.4.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 192.88.4.0/25
Down right: 192.88.4.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
192.88.4.3	PTR	linux.percomp.de
192.88.4.5	A+PTR	gateway.percomp.de
192.88.4.5	A	gateway.f-prot.de
192.88.4.5	A	gateway.fp-win.de
192.88.4.6	PTR	ftp2.percomp.de
192.88.4.6	A	www.percomp.de
192.88.4.6	A	fp-win.de
192.88.4.130	A+PTR	mail.gi-fb-sicherheit.de