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
No-IP - Dynamic DNS and Managed DNS Provider
Dns Jumper - DNS Jumper is a portable freeware App which makes changing your DNS settings as easy as clicking a button , it is the world's first IPv6 supported Dns tool
DNS-O-Matic - DNS-O-Matic (dnsomatic.
namebench - Provides personalized DNS server recommendations based on your browsing history.
iWantMyName - Register your own custom domain for web applications, email, blog or website such as Google Apps...
Public DNS Server Tool - Public DNS Server Tool is a small utility for changing the DNS servers in Windows XP, Vista, 7 and...