can we add 4 name servers to same server with same ip address?

we have a server with 30+domains all using as name server
ns1.xxx.com and ns2.xxx.com


we have a new client that wants to host a new domain on the same server using his domain as the primary and secondary DNS or a different domain than the one we are currently using  

can we register a mother domain for that same server using the same IP address of the original name servers or do we need to register two new IP addresses for that server? I am thinking we need to use 2 new IP address but need to confirm that this will work or that we even have 2 differetn primary nameserves using differnt domains :)  thnx in advance
webguy62Asked:
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RizyDeWinoConnect With a Mentor Commented:
Yes you can register as many child servers as you want against the same set of two IPs you have for your main Primary/Secondary NS.


If you current NS are :

ns1.xxx.com  - 1.2.3.4
ns2.xxx.com  -  1.2.4.4

Now if your client domain is clientdomain.com then you can register NS like :

ns1.clientdomain.com  - 1.2.3.4
ns2.clientdomain.com  - 1.2.4.4

Similarly you can repeat this for as many clients are you want using the same two IPs.

For setting up Nameservers you will need to do two steps :

1. registering child Namesrvers  ns1.clientdomain.com and ns2.clientdomain.com against IPs 1.2.3.4 and 1.2.4.4 at registrar of clientdomain.com

2. Add glue/A records for the Nameservers . i.e. Add DNS A record for ns1 and ns2 in the DNS zone file for domain clientdomain.com.

So again to conclude you can add as many NS as you want against the Same two IPs you have for your primary/secondary NS.
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meb_santosoCommented:
# can we add 4 name servers to same server with same ip address?

yes you can, but it will be a single point of failure. The point of having more than one name server on different IP addresses (better yet, on different AS) is to prevent the website being unreachable of one name server is failing.

# we have a new client that wants to host a new domain on the same server using his domain as the
# primary and secondary DNS or a different domain than the one we are currently using

-. so let say the domain is mynewdomain.com
-. your server is myhostingserver.com, having ns1.myhostingserver.com and ns2.myhostingserver.com (IP 1.1.1.1 and 2.2.2.2)
-. he wants to utilize ns1.mynewdomain.com & ns2.mynewdomain.com as his NS entries
ns1 & ns2.mynewdomain.com

is this possible? YES. Make adjustments in your domain control panel (it's called child name server).

If he wants to point them to your ip addresses, you can do so while setting up the child name server.

If he wants to utilize 3rd & 4th name server, it is also possible, but the DNS entries on ALL the servers must match each others.
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