Robtex

Up: 217.23.56.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 217.23.57.0/25
Down right: 217.23.57.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
217.23.57.1	PTR	port-pub-eschenbach.i-netpartner.net
217.23.57.20	A	remote.lamm-schlat.de
217.23.57.20	A	remote.manufaktur-joerg-geiger.de
217.23.57.20	A	mx20.lamm-schlat.de
217.23.57.37	A+PTR	intra.haerterei-technotherm.de
217.23.57.37	A	mail.tt-werk1.de
217.23.57.37	A	mail.tt-werk2.de
217.23.57.114	PTR	gateway-drkgp.i-netpartner.net
217.23.57.114	A	drk-gp.kdyn.net
217.23.57.114	A	mail.drk-goeppingen.de
217.23.57.178	PTR	gate-unknown.i-netpartner.net
217.23.57.178	A	mx2-eu1.sematris.net
217.23.57.180	A	mail.allmendinger-reisen.de
217.23.57.218	A	mx10.af-k.de
217.23.57.251	A+PTR	mx0.af-k.de