Whether or not the DNS-323 has a WAN address would depend on the network it is connected to.
Perhas an explanation is warranted.
Ignoring for now the new IPv6 (also known as IPng or IP next generation), which I think can safely be done, since we are unlikely to see a complete switch from our current IPv4 technology any time soon, there are basically two types of ip address - private LAN (local area network) addresses, and public ip addresses, which are sometimes known as WAN (wide area network) addresses.
To communicate across the internet, unique ip addresses are required and these are generally known as public addresses, for reasons that will shortly become apparent - these public ip addresses are regulated and must be purchased from ICANN (Internet Corporation for Assigned Names & Numbers), several network ranges have been set aside for private use on local area networks, and these private ranges can be used by anyone for internal network use, without the need to seek prior permission - the 192.168.x.x range commonly found in home networks is one example of a private network range, there are others.
In a nutshell, if you are not using one of the address ranges set aside for private use, you will be using a public address - strictly speaking this is not necessarily a WAN address, since many larger corporations had the foresight to purchase large blocks of addresses early on, and use these addresses on their internal networks - IBM for example owns the 9.x.x.x network range and uses this internally - but to all intenets & purposes, especially to us consumers, a public ip address can be considered a WAN address.
Most consumers will have a typical consumer network with a consumer grade router that allows a single public address to be shared amongst several computers or similar devices using a process known as NAT or network address translation, this router will have a LAN interface with a private address typically in the 192.168.x.x range and a WAN interface with a public ip address that is assigned by the ISP. In this case - as gunrunnerjohn has pointed out - your WAN address is the WAN address of your router, and an easy way to find it is to use the
Whatismyipaddress website.
It is possible (and I know of a few people who have done it but I would not recommend it), if your ISP allows you multiple public addresses to connect your DNS-323 in such a way that it has it's own public ip address - so ...
Yes, a DNS-323 can have a WAN address, but this would not be normal.
