Cache Wildcard Domains

[Kelvin Loke]

Hi,

I am wondering if this can be done:

Visitor can access to our website using many different domains:

Eg.
www.123.com
www.abc.com
www.567.com
www.xyz.com

All these domains point to the same website same contents.

To better utilize the cache, can I keep one cache of
http://xxx.xxx.xxx/photo.png, instead of 4 cache for 4 different
domains?

Thanks!

Regards,
Kelvin Loke