Regions and Access Endpoints

Last updated: 2020-09-14 10:36:01


    A region is an area where a Tencent Cloud managed data center is deployed. COS data is stored in buckets in these regions. You can use COS to store your data in multiple regions. In general, we recommend you create buckets in the region closest to the location where your business is conducted so as to reduce latency and costs and meet compliance requirements.

    For example, if your business is distributed in South China, creating buckets in the Guangzhou region can further accelerate object uploads and downloads.

    The default domain name refers to the default domain name of a COS bucket which is automatically generated by the system based on the bucket name and region when the bucket is created. It varies by region.


    After a bucket is created, the corresponding default domain name will be generated, which can be viewed in Basic Configuration of the bucket in the COS Console.

    Mainland China

    Region Abbreviation Default Domain Name (Upload/Download/Management)
    Mainland China Public cloud regions Beijing Zone 1 (sold out) ap-beijing-1 <BucketName-APPID>
    Beijing ap-beijing <BucketName-APPID>
    Nanjing ap-nanjing <BucketName-APPID>
    Shanghai ap-shanghai <BucketName-APPID>
    Guangzhou ap-guangzhou <BucketName-APPID>
    Chengdu ap-chengdu <BucketName-APPID>
    Chongqing ap-chongqing <BucketName-APPID>

    Hong Kong (China) and Outside Mainland China

    Region Abbreviation Default Domain Name (Upload/Download/Management)
    Asia Pacific Public cloud regions Hong Kong (China) ap-hongkong <BucketName-APPID>
    Singapore ap-singapore <BucketName-APPID>
    Mumbai ap-mumbai <BucketName-APPID>
    Seoul ap-seoul <BucketName-APPID>
    Bangkok ap-bangkok <BucketName-APPID>
    Tokyo ap-tokyo <BucketName-APPID>
    North America Silicon Valley na-siliconvalley <BucketName-APPID>
    Virginia na-ashburn <BucketName-APPID>
    Toronto na-toronto <BucketName-APPID>
    Europe Frankfurt eu-frankfurt <BucketName-APPID>
    Moscow eu-moscow <BucketName-APPID>


    Suppose you log in to the COS Console with your root account (APPID: 1250000000) and create a bucket named examplebucket in the Guangzhou region, then the default domain name of the bucket is as follows:


    • examplebucket-1250000000 means that the bucket is owned by the user with APPID 1250000000. APPID is the account you get after you successfully register in Tencent Cloud. It is automatically assigned by the system as a unique permanent ID, which can be viewed in Account Information.
    • cos means Cloud Object Storage (COS).
    • ap-guangzhou is the abbreviation of the bucket region.
    • is a fixed Tencent Cloud domain name.

    After the bucket is created, upload an image file picture.jpg to the bucket, and the access address of the image is as follows:


    If you set the access permission of the image to public read/private write, you can paste its access address into a browser to open it and view its details.

    Private Network and Public Network Access

    The access domain names of COS use intelligent domain name resolution, so that your requests to COS can be routed through the optimal linkage in case of cross-ISP access.

    If you deploy a service in Tencent Cloud to access COS, intra-region access requests will be automatically directed to a private network address. Currently cross-region requests do not support private network access and will be resolved to a public network address by default.

    For more information on private network and public network access, please see Creating Request Overview.

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