On May 20, 2013, at 10:03 AM, Guy Harris <guy at alum.mit.edu> wrote: > It's a pointer to *BINARY* data Or, rather, it's a blob of binary data, but the key word here is *binary* - you can't print it with %s, you need inet_ntoa() or inet_ntop() or a routine such as that to translate it to a human-readable form.