More on four-dimensional extremal black holes

We consider an embedding of the extremal four-dimensional Reissner-Nordstr\"om black hole into type IIB string theory. The equivalent type IIB configuration, in the D-brane weak-coupling picture, is a bound state of D1- and D5-branes threaded by fundamental type IIB strings. The bound state involves also a NSNS solitonic 5-brane, mimicking the role of the Kaluza-Klein magnetic monopole. The statistical entropy derived by counting the degeneracy of the BPS-saturated excitations of this bound state agrees perfectly with the (semiclassical) Bekenstein-Hawking formula