Find all host A records in loadsharing

[AnyBody43]

Hi,

I need to configure a firewall to pass traffic from our internal 
network to certain internet host (for example to allow ftp to
ftp.hp.com) but many do diabolical load sharing/
redundancy schemes and I get different A records returned every time
I do a lookup.

So taking the case of ftp.hp.com, is there a way for the average
punter to get a definitive list of the IP addresses currently
in use by ftp.hp.com.

So far I have 

66.98.244.52   

161.114.22.105
161.114.22.111

192.6.165.119 

192.6.234.8
192.6.234.9
192.6.234.10

192.151.52.187
192.151.53.86

Using nslookup against various name servers throught the world.

I do 
nslookup
set type=A   #default anyway?
ftp.hp.com


I hope that this is within the coverage of this group.

Thanks in advance.