Robtex

Up: 193.27.20.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 193.27.20.0/24
Down right: 193.27.21.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
193.27.20.228	PTR	mail.kdvz-frechen.de
193.27.20.228	A	mx2.paul-kraemer-schule.de
193.27.20.228	A	mx2.heinrich-boell-schule.eu
193.27.20.229	PTR	mail1.kdvz-frechen.de
193.27.20.230	A+PTR	mail2.kdvz-frechen.de
193.27.20.233	A+PTR	mx01.kdvz-frechen.de
193.27.20.234	A+PTR	mx02.kdvz-frechen.de
193.27.20.244	A+PTR	dns1.kdvz-frechen.de