How to stop: host -a -l XXX.com ???

[Do]

How do they do this:


[donar at front02 mail]$ host -a -l gcs.co.za
rcode = 0 (Success), ancount=3
Found 1 addresses for apollo.is.co.za
Found 1 addresses for hermes.is.co.za
Found 1 addresses for ns0.pipex.net
Trying 196.4.160.2
Server failed, trying next server: Query refused
Trying 196.4.160.8


If I ask for only one host it's no problem... like nslookup www.gcs.co.za

But I can get the: host -a -l

I want to konw how they do this,

Regards,

Donar

ps. Email your answere too please.