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Blockchain is not a good or secure technology to replace DNS. Gnu Name system is a good one.

Here you can find a criticism of NameCoin and blockchain :

In addition to Namecoin there's also Onename, which used to use Namecoin and has now migrated to Bitcoin. Details on why and how it works are on their blog:

http://blog.onename.com/

Exact link:

http://blog.onename.com/namecoin-to-bitcoin/

There's namecoin, but I'm not sure if it is widely used: https://namecoin.info/

https://github.com/mwarning/KadNode

Namecoin is one

I found this on namecoin: https://bit.namecoin.info/

Looks interesting.