This document is about: FUSION 2


Photon Cloud provides you with global connectivity to allow low latency gaming all around the world. This is done by hosting servers in various regions.

As the available regions may change over the lifetime of a project, clients get the current list of regions from our Photon Name Servers.

Each region is completely separate from the others and consists of a Master Server (for matchmaking) and Game Servers (hosting rooms).

photon cloud regions' connect flows
Connect to Photon Cloud regions

The list of available regions differs per product (Fusion, Quantum, Chat etc.). With the Region Allowlist, you can define which regions should be available per AppId (see below).

Below is the list of regions for this product.

Available Regions

Photon Cloud has servers in several regions, distributed across multiple hosting centers over the world.

Each Photon Cloud region is identified by a "region token".

List of available regions and tokens:

The strings for region tokens(or codes) are case insensitive. Example: "EU" or "eu" are both accepted and refer to the same Europe region.
RegionHosted inToken
Chinese Mainland (See Instructions)Shanghaicn
Hong KongHong Konghk
South AmericaSao Paulosa
South KoreaSeoulkr
United Arab EmiratesDubaiuae
USA, EastWashington
USA, WestSan Joséusw

Region Allowlist

You can filter the list of available Photon Cloud regions per application on the fly directly from the dashboard.

photon cloud: regions allowlist
Filter Photon Cloud Regions

Go to the dashboard and then click "Manage" for a chosen application and then click "Edit". You will find an input field where you can enter the list of allowed regions as follows:

  • the allowlist should be a string of region tokens separated by semicolons. e.g. "eu;us".
  • region tokens are case insensitive and are defined here.
  • undefined or unrecognized region tokens will be ignored from the list.
  • empty ("") or malformed string (e.g. ";;;") means empty list.
  • empty list means all available regions are allowed.

Once you confirm and save, the NameServer will return only the filtered list of regions. Thus, clients should select from that list. Take into consideration that dashboard updates propagation can take up to 10 minutes.

How To Choose A Region

Users in the US have the lowest latency if connected to the Photon Cloud US region. Easy.

But what if you have users from all over the world?

You can

  • a) let the game client ping the different Photon Cloud regions and pre-select the one with the best ping, read our how-to
  • b) distribute client builds tied to a region, so users from different regions connect to different Photon Cloud regions or
  • c) let the user choose a matching region from within your game`s UI.

Alternatively, you can d) let all users connect to the same region if the higher latency is acceptable for your gameplay, e.g. with any "not-so-realtime" games.

All Photon Cloud apps are working in all available regions without any extra charge. See pricing.

Photon Cloud's dashboard lets you monitor the usage of your game in each region and easily upgrade or downgrade your subscription plan. Go to your dashboard.

How To Select A Region At Runtime

By default, if no Region is set either on the PhotonAppSettings or via code, Fusion will try to connect to the Best Region. Meaning that at the start-up process, it will ping all available Regions and connect to the one with the lowest ping. Keep in mind that Best Region is not deterministic and sometimes it may be "random" due to little variations or exact same ping calculations.

If the Best Region feature is not desired, it is possible to let the player choose which Region to connect to at runtime. This can help to lower the ping between players if they are connecting to a common Region or just want to join a Session with friends that are playing on a specific Region.

The Region selection can only be done when the NetworkRunner is not running, as this can't be changed while it is already connected to a particular Region. In the following snippet, it is shown how a NetworkRunner can use a custom Region in runtime:


public class FusionInit : MonoBehaviour {

    // ...

    // Start a NetworkRunner with a Game Mode and connect to the specified Region
    public Task<StartGameResult> StartSimulation(NetworkRunner runner, GameMode gameMode, string region) {

        var appSettings = BuildCustomAppSetting(region);

        return runner.StartGame(new StartGameArgs() {
            // ...
            GameMode = gameMode,
            CustomPhotonAppSettings = appSettings

    private AppSettings BuildCustomAppSetting(string region, string customAppID = null, string appVersion = "1.0.0") {

        var appSettings = PhotonAppSettings.Instance.AppSettings.GetCopy();

        appSettings.UseNameServer = true;
        appSettings.AppVersion = appVersion;

        if (string.IsNullOrEmpty(customAppID) == false) {
            appSettings.AppIdFusion = customAppID;

        if (string.IsNullOrEmpty(region) == false) {
            appSettings.FixedRegion = region.ToLower();

        // If the Region is set to China (CN),
        // the Name Server will be automatically changed to the right one 
        // appSettings.Server = "";

        return appSettings;

Using The Chinese Mainland Region

You need to request access to the Chinese Mainland region for your Photon application. Send us an email so we could unlock it for your AppID.
You cannot subscribe to paid plans to be used in the Chinese Mainland region via our website. Reach out to us by email to receive a quote for any subscription.

The Photon Name Server has to be local to China, as the firewall might block the traffic otherwise. The Chinese Photon Name Server is "".

Connecting with clients from outside of China mainland will most likely not produce good results. Also, connecting from the Photon servers to servers outside of China mainland (e.g. for Custom Authentication, WebHooks, WebRPCs) might not be reliable.

Important: in the current phase, changes you make to your app via your dashboard are not automatically reflected in the app caches for China. Let us know by email if you have an update request there.

Also, for legal reasons, you need a separate build for China and we recommend using a separate AppId with it. For example, use a compile condition (of your choice) to change the AppId and the Photon Name Server depending on the build.

Follow the instructions corresponding to your client SDK to make a special build for the Chinese market.


Using PhotonAppSettings

fusion: photonappsettings for china
Fusion: PhotonAppSettings for China

Using Code


public class FusionInit : MonoBehaviour {

    // ...

    async void ConnectToChina()
        var runner = BuildNetworkRunnerInstance();

        // Start new Runner with the Host Migration Token
        var result = await StartSimulation(
            GameMode.AutoHostOrClient, // Or any other GameMode
            "cn" // Select China Region

        // Check results as usual
        if (result.Ok == false) {
        } else {
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