You might be able to set the cookie (that is, get some browser to accept and store it), but no browser that I know of will actually return it to you. Where they to do so, it would introduce a massive security hole.

Think about it for a moment. It's possible to set a cookie for ".example.com" that will be returned by a browser for visits to "example.com", "www.example.com", or "a.b.c.example.com". But what of ".1.1"? That would match sites all over the place.