reverse lookup zone

Hi,
I have a small network with 7 servers.
But when I check my 1. dns no reverse look up zone is installed and on the 2. dns also not.
Is it not necesarry ?
Eprs_AdminSystem ArchitectAsked:
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Kieran_BurnsCommented:
None whatsover,
create a primary zone and if applicable store it in Active directory. Under the Network ID put the main subnet that covers your network. any smaller subnets will be automatically created under this one.
e.g. if you put 172.16 and then click next, you will have a reverse DNS zone of 172.16.0.0 /16
If you have subnets off this one like 172.16.1.0/24 and 172.16.2.0/24 these will be created for you.
 
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Kieran_BurnsCommented:
It's not necessary, but very useful.
I've always created the basic RDNS zones manually anyway. Just note what your main subnets are and create the zones. they will be populated as soon as any workstation or device communicates with the DNS servers
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Eprs_AdminSystem ArchitectAuthor Commented:
Can you explain, why it is very helpful ?
What is the benefit ?
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Kieran_BurnsCommented:
DNS maps the name of a device to the IP address, RDNS does just the opposite - maps the IP to the name
So if you know the IP address of a device and want to know what the NAME of it is: RDNS does this for you
If you use NSLOOKUP and put in the IP address you will get the name - but only if you have the zones created.
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Eprs_AdminSystem ArchitectAuthor Commented:
ok thanks.
So its no problem when I enter now my reverse lookup zone.
Right ?
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Eprs_AdminSystem ArchitectAuthor Commented:
I have one more question.
I have 3 reverse lookup zones installed, but not from me.
They are standard primary zones.

1. 0.in-addr.arpa
2. 127.in-addr.arpa
3. 255.in-addr.arpa

What about this zones ? For what do I need them ?
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Kieran_BurnsCommented:
they are standard pre-defined subnets - and can actually be removed but personally i would leave them
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Eprs_AdminSystem ArchitectAuthor Commented:
Thanks a lot.
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