UNET : netId value is different before spawning and after spawning

I instantiated an object using Instantiate(bullet) inside [Command] function. When I debugged netId value of that instantiated object it showed me 0 in the console, but after adding NetworkServer.Spawn(obj), I again debugged netId value then it showed me 2, why is that?

Code (CSharp):

1. [Command]
2. void CmdFire() {
3.  
4.    GameObject obj = Instantiate(bullet);
5.    Debug.Log(obj.GetComponent<NetworkIdentity>().netId); // here netId value is zero
6.     NetworkServer.Spawn(obj);
7.     Debug.Log(obj.GetComponent<NetworkIdentity>().netId); // here netId value is 2
8. }

 

netId is assigned after spawning. Before it's just a regular GameObject in the scene (not networked).

 

Ok,thanks @vis2k