NetworkView.viewID  

function OnNetworkInstantiate (info : NetworkMessageInfo) {
    var networkViews : NetworkView[] = GetComponents(NetworkView);
    Debug.Log("New prefab network instantiated with views - ");
    for (var view : NetworkView in networkViews)
        Debug.Log("- " + view.viewID);
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void OnNetworkInstantiate(NetworkMessageInfo info) {
        NetworkView[] networkViews = GetComponents<NetworkView>();
        Debug.Log("New prefab network instantiated with views - ");
        foreach (NetworkView view in networkViews) {
            Debug.Log("- " + view.viewID);
        }
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def OnNetworkInstantiate(info as NetworkMessageInfo):
        networkViews as (NetworkView) = GetComponents[of NetworkView]()
        Debug.Log('New prefab network instantiated with views - ')
        for view as NetworkView in networkViews:
            Debug.Log(('- ' + view.viewID))