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Last update: 2021-11-11

Dynamic DNS

Dynamic DNS (DDNS) enables you to access the firewall when it is provisioned with a dynamic IP address.

When the firewall receives a new IP address, it contacts the dynamic DNS service and updates the public DNS name with the new address. Using DDNS, the public DNS name always points to the correct IP address.


We're discontinuing Sophos DDNS in 18.5 MR1 and later. You can't register DDNS domains using any longer. We recommend configuring a third-party DDNS provider.

Currently, if you upgrade to these versions or restore a backup configuration containing Sophos DDNS, the existing DDNS configuration may continue to be available. For details, see Discontinuation of Sophos DDNS.

Currently, we support the following third-party DDNS providers:

  • DynDNS
  • DynAccess
  • EasyDNS
  • ZoneEdit
  • Google DDNS
  • Namecheap
  • DNS-O-Matic
  • No-IP
  • FreeDNS
  • Cloudflare
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