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Im changing the nameserver some domains that I have registered on register365, they allow a user to enter two nameservers and a tertiary nameserver. The new nameservers I am using are AWS which has four nameservers. I was wondering do I need to use all four of these or does that matter? Also what is the tertiary nameserver?

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No, two is sufficient however the 3rd is used more as an added backup measure, 4 would be unnecessary –  Liam Sorsby Feb 13 at 16:42
    
Ok thanks thats what I was thinking just wanted to be 100% on it. –  Ronan Feb 13 at 16:50
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up vote 2 down vote accepted

In my experience, two nameservers are required, and three are sufficient. Four is overkill.

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