[db-wg] Can't find a lot of IPs in the DB

Dear list,

a part of a small research project includes to analyze our servers log-file.
I need to find out a bit more from the IP entries (reverse look-up) like
the name of the company and the country.

To do so, I was downloading the WhoIs-DB "ripe.db.inetnum.gz" from
ftp://ftp.ripe.net/ripe/dbase/split/ but a lot of the IPs can't be resolved.

E.g. I have the IP of my uni 160.85.0.0 that I can't find in the above DB.
But if I try it in a shell with the whois command "whois -h 
whois.ripe.net 160.85.0.0" it
gives me all what I need.

What do I missunderstand here? Is it the wrong DB?
My skills in such things are not really good, so sorry, if my question 
is to basic.

thanks for any hints

Thomas
<ftp://ftp.ripe.net/ripe/dbase/split/ripe.db.inetnum.gz>

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