Using DNS-O-Matic dynamic DNS updates with Cloudflare

DNS-O-Matic is a service from OpenDNS for distributing dynamic DNS updates to supported authoritative DNS services. Cloudflare is one of the supported services.

Using DNS-O-Matic allows you to pick and choose what dynamic DNS services you want to notify, all from one easy-to-use interface.

Below are the settings for both DNS-O-Matic and Cloudflare. You'll want to make sure to use your own information in place of anything wrapped with < >.

DNS-O-Matic Settings

Username: <CLOUDFLARE ACCOUNT EMAIL>
API Key: <CLOUDFLARE CLIENT API KEY>
Domain: <example.com>
Host: dynamic

Cloudflare DNS Settings (Cloudflare.com > DNS > DNS Records)

 Type: A  Type: CNAME  Type: CNAME
 Name: dynamic  Name: <example.com>  Name: www
 Value: <WAN IP from DNS-O-Matic>  Value: dynamic.<example.com>  Value: <example.com>

 

Your Cloudflare API Key is found in the My Profile section, linked from the top right of the Cloudflare dashboard.

One limit: if you have multiple A records for the hostname you are updating, DNS-O-Matic will update the first record found, not others. (For dynamic DNS, multiple A records for a single hostname is unlikely.) One possible workaround would be to change additional records to CNAME records pointing to the original A record as done in the example records above.

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