whois 172.18.0.163

% This is the dn42 whois query service.

% Information related to 'inetnum/0.0.0.0_0':
inetnum:            0.0.0.0 - 255.255.255.255
cidr:               0.0.0.0/0
netname:            NET-BLK0-DN42
policy:             reserved
descr:              * The entire IPv4 address space
mnt-by:             DN42-MNT
status:             ALLOCATED
source:             DN42