DNS database server

Welcome to the DNS database server

If you are a network administrator at Cornell, you can use this database to record and update DNS information for hosts on the subnets and domains that you administer. Changes made in this database will be uploaded to the three Cornell production DNS servers (dns, cudns, bigred) every three hours.

The links in this table are protected by SideCar/CUWebLogin and are restricted to Cornell staff.
Network Administrator List: If you're not listed as the NetAdmin for any of your subnets or subdomains, then you won't be able to update those records. Please send NetAdmin corrections to the hostmaster@cornell.edu.	Cornell Subnet Administrator Info
Subnet and domain lists: Once you are assigned as NetAdmin to an IP subnet or DNS domain, you can make changes to the NetAdmin comment field and specify contact lists or escalation paths for other NetAdmins and the NOC to use in an emergency.	Subnet List (numeric IP addresses) Domain List (alphanumeric DNS names)
Host list: NetAdmins can add hosts to their own subnets and domains. To add, modify, or delete a host, you must be the NetAdmin for both the subnet (e.g. 128.253.230.0) and the domain (e.g. aep.cornell.edu). If you are the NetAdmin for one but not the other, your request will be denied. For wireless access points, on the Host Administration page, scroll down to "Auxiliary Info" and fill in two required fields: Location (format: "`building` floor `n` room `nnn`") and SSID (format: "`ssid`")	Host List
A batchload interface is available to add and delete hosts via command instead of a web interface.	batchload Instructions

Instructions for viewing and updating lists:

Click on the Subnet List, Domain List, or Host List link above.
Subnets or domains for which you are known to be a NetAdmin are listed at the top, followed by a separate, longer list of all the subnets or domains in the database (which any Cornell staff member may inspect but not modify). If a subnet or domain for which you are responsible is missing from the short, upper list, please notify hostmaster@cornell.edu to update the list of NetAdmins. You won't be able to modify records for that subnet or domain until the hostmaster adds you to the NetAdmin list.
Select an entry by clicking the radio button to its left. You can only select one entry at a time.
Click the nearest "inspect/modify" button. These buttons are spaced throughout the list so you won't have to scroll all the way to the top or bottom to find one.
If you see a Security Information dialog, click Continue.
The database information you requested will open in a separate browser window.
- For your own subnets, you can add people to or remove people from the list of NetAdmins (listed by NetID) or the list of email addresses to be notified when changes are made to this subnet. Other changes need to be sent to the Hostmaster.
- For your own domains, you can add or delete NetAdmins and email addresses as above, and domain-level MX records.
- For subnets or domains that belong to someone else, you can see who the NetAdmins are and how to contact them.
If you're working with the Host List, you have some additional options.
1. At the top, you can create a new record by assigning a hostname (such as foo.bar.cornell.edu) to an IP address (such as 128.254.135.24) and clicking the "create this host" button. You must specify the full domain name and address, not just the "foo" part of the hostname.
2. You'll see a list of all the hosts on the subnet you selected. Choose a host by clicking the radio button to its left and then clicking the "inspect host data" button. A host attributes page will open in a third browser window. You can fill in secondary addresses, host info, aliases, MX records, and the NetID of the person using this host.
Close the extra browser window(s) when you're done. The Subnet, Domain, or Host List is still displayed in your original browser window.

Notes:

Mail exchange (MX) records are handled on either the domain level or the host level. If you add a MX record at the domain level it is added to every host in that domain. If you add an MX record to a host, it only pertains to that host.
Lowest usable address: The bottom 10 IP addresses in a subnet are usually reserved for the network engineers to put routers, bridges, and concentrators. If your subnets have hosts in that range, you can ask that the "lowest usable address" field be modified to suit your needs.

Welcome to the DNS database server

Instructions for viewing and updating lists:

Notes:

Related Links