APNIC description: "unknown"

[Vovan]

Hello,

sorry for possibly trite question, but what does this ">>UNKNOWN<<" 
mean? e.g.:

 > Network            Origin AS  Description
 > 41.222.79.0/24       36938     >>UNKNOWN<<

quote from: http://thyme.rand.apnic.net/current/data-add-IANA


Cheers,

Vladimir