This IpAddress value is empty of source description but its name and read-create access identify it as the first address in a NAT address pool row. An admin configuring dynamic NAT relies on this together with the pool's end address to define the range of public IPs that internal hosts get translated to when they go out to the Internet. For example, an admin might set this to 203.0.113.10 to mark the start of a pool that will let a branch office's private LAN share a small block of public addresses.