local RIPE database - question

Hello,

My organisation is interested in RIPE database.
It wants to know what are the main ISP of our customers who connect our website.
First we would retrieve IP address of our Internet users then we would query your database to retrieve "netname" attribut ("inetnum" object).

To do that we need to download "whois client software" (work on Linux system ?) and query your server :
	whois -h whois.ripe.net 134.157.0.0

But the number of our daily queries will be too high to query your server.
So I think we should donwload your database on our local server.
So we have to download "ripe.db.inetnum.gz " ?
To query this local database we still need "whois client software" ?
Do we need to use "whois server" ?

In advance thank you very much for your answer,
Muriel Léchelon