You must be listed as the network administrator for a subnet or subdomain before you can update records.
Check the Cornell Subnet Administrator Listing
To see which subnets...
You must be a netAdmin for both the domain and the subnet before you can make changes to a host. You can be added as a netadmin by another netadmin for that domain and subnet.
Using the DNS...
Once you are assigned as NetAdmin to a subnet, using the DNS database, you can:
Make changes to the NetAdmin comment field.
Specify contact lists or escalation paths for other...