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Add a dynamic DNS provider

Sophos Firewall supports third-party dynamic DNS (DDNS) providers.

To add a dynamic DNS provider, do as follows:

  1. Go to Network > Dynamic DNS and click Add.
  2. Enter the hostname you received when you registered with your DDNS service provider using the following format:

    <accountname>.<DDNS provider>.com

    Some providers may use a different format. For example, you may need to specify the domain and subdomains for some providers and use just the domain as a sign-in name. Check with your DDNS provider.


    We're discontinuing Sophos DDNS in 18.5 MR1 and later. You can't register DDNS domains using any longer.

  3. Select an interface. Its IP address is bound to the hostname you've specified.

  4. Select the IPv4 address of the interface.

    • Use port IP: IP address of the interface.
    • NATed public IP: Translated IP address of the interface. Use this if your firewall is behind a router and uses a private IP address.


    Sophos Firewall checks for a change in the server IP address every 5 minutes.

  5. Select the third-party DDNS provider from the Service provider drop-down list.

  6. Enter the Login name and Password based on your provider.

    If your provider doesn't require a username you must enter your domain for the Login name.

    DDNS provider Credentials
    DynDns Username

    Updater client key

    See Getting Started with Dynamic DNS

    ZoneEdit Username

    Dynamic token

    See Dynamic DNS.

    EasyDNS Username

    Dynamic token

    See How To Use Dynamic DNS.

    DynAccess Username


    No-IP Username


    DNS-O-Matic Username


    Google DDNS Username


    Namecheap Username


    FreeDNS Username

    Update key

    See Router Setup Guide.

    Cloudflare Email address

    Global API key

    See Cloudflare API key.

  7. Click Save.