whois 192.0.0.0/8
whois x.x.x.x/yy

NetRange:       192.0.0.0 - 192.255.255.255
CIDR:           192.0.0.0/8
NetName:        NET192
NetHandle:      NET-192-0-0-0-0
Parent:          ()
NetType:        Early Registrations, Maintained by ARIN
OriginAS:
Organization:   Various Registries (Maintained by ARIN) (VR-ARIN)
RegDate:        1993-05-01
Updated:        2010-06-30
Ref:            http://whois.arin.net/rest/net/NET-192-0-0-0-0

OrgName:        Various Registries (Maintained by ARIN)
OrgId:          VR-ARIN
Address:        3635 Concord Parkway, Suite 200
City:           Chantilly
StateProv:      VA
PostalCode:     20151
Country:        US
RegDate:        1993-05-01
Updated:        2011-09-24
Comment:        Address space was assigned by the InterNIC regardless of
Comment:        geographic region.  The registrations are now being maintained
Comment:        by various registries, and the in-addr.arpa delegations are
Comment:        being maintained by ARIN.
Ref:            http://whois.arin.net/rest/org/VR-ARIN

Internet Assigned Numbers Authority PRIVATE-ADDRESS-CBLK-RFC1918-IANA-RESERVED (NET-192-168-0-0-1) 192.168.0.0 - 192.168.255.255
Various Registries (Maintained by ARIN) NET192 (NET-192-0-0-0-0) 192.0.0.0 - 192.255.255.255

The Internet Assigned Numbers Authority (IANA) has reserved the
   following three blocks of the IP address space for private internets:

     10.0.0.0        -   10.255.255.255  (10/8 prefix)
     172.16.0.0      -   172.31.255.255  (172.16/12 prefix)
     192.168.0.0     -   192.168.255.255 (192.168/16 prefix)

192.0.0.0/24 is reserved for IETF protocol assignments.
  192.0.0.0/29 is reserved for clients of ds-lite 464xlat and similar
  192.0.0.8/32 is reserved as a dummy address for 4rd
  192.0.0.9/32 is an anycast address for "port control protcol"
  192.0.0.170/32 and 192.0.0.171/32 are used for DNS64 discovery
192.0.2.0/24 is reserved for documentation, examples etc
192.31.196.0/24 is used for "AS112 Redirection Using DNAME"
192.52.193.0/24 is used for "Automatic Multicast Tunneling"
192.88.99.0/24 is used as an anycast prefix for 6to4 relays
192.168.0.0/16 is private use
192.175.48.0/24 is Direct Delegation AS112 Service