I can use my own domain for free and it works just fine with IPv4 and IPv6.
I'm using it with am apple airport router and it's working fine
Amazon Route 53 - Amazon Route 53 is a highly available and scalable DNS web service.
No-IP - Dynamic DNS and Managed DNS Provider
OVH Cloud - OVHcloud provides cloud solutions to meet all of your IT needs. With cutting edge cloud technology, come view our solutions by industry or use case.
DNS-O-Matic - DNS-O-Matic (dnsomatic.
XenoNode - XenoNode is one of the leading cloud solutions providers that have employed the best cloud services providers to ensure the quality performance all with peace of mind at very affordable pricing.
iWantMyName - Register your own custom domain for web applications, email, blog or website such as Google Apps...