Testing Server without domain name

[Christian Becker]

Hi There,

at the moment I'm waiting for my Domain-Name (because of some problems this will last a few days).

Now I wanna test nginx only with IP-Adress.
This is no Problem for Default but how about sub-Domains?
Is it possible to internally map 1.2.3.4/abrakadabra to abrakadabra.1.2.3.4? 
With domain-Name this seems to be no problem, but without?

Thanks allot - and sry I'm a beginner.
Chris