Which Wireless/DSL modems support Duck Dynamic Domain Name Service

[Kerubu]

I am looking to buy a new DSL modem with wireless capabilities however I need it to support DDNS.

I have found that support for DDNS isn't great across modem manufacturer's and haven't found any that would allow a 'custom' DDNS service to be specified e.g. Duck DDNS.

Which Netgear modems available in the UK will allow me to configure a custom DDNS and not limit me to a select few?

[netwrks]

You can't add software to stock firmware.

[Kerubu]

I didn't mean to add custom Firmware, I meant I want to be able to use DuckDNS but which Netgear routers allow me to specify a DDNS provider of my choosing rather than a preset, limited list (as I have found with routers so far). DuckDNS supports standards such as GNUDIP.http, DynDNS, inadyn and DNSOmatic. Do any Netgear routers support these?