Can we put random entries on DNS

Using microsoft DNS All/most of our local hosts ( with in ) are in following domain

*.company.org So a host name will look like mymachine001.company.org

Is it possible to set up wild card DNS entries of the form ?

*.subd.company.com

Note: The URL ends with .com, all other hosts so far ever set up in the DNS were of the format *.company.org

what i am trying to achieve is the following. A user with in internal network types a url http://someprefix.subd.company.com in browser and enters. Since there is a wild card entry in DNS, the user gets routed to host mapped to *.subd.company.com in the DNS

Note : at the same time, company.com has a public DNS entry and that is mapped to a physical IP in some other network (data center)

Solution 1:

Yes, this is possible - you will need to create a DNS zone on your DNS server(s). You can do one of two things:

Create a zone for the whole of `company.com` and then add *.subd

The advantage is that you will have complete local control over this domain, the potential disadvantage is that it create a full split DNS setup. Meaning that if a load of subdomains exist (E.g, mail.company.com, staff.company.com etc etc) you will need to recreate all these in your DNS Zone.

or

Create a zone JUST for `subd.company.com` and then a wildcard for the whole thing

The advantage here being that mail.company.com will still go through your normal forwarding routes meaning you don't have to mess. The disadvantage is that you need to be very aware of what you do and don't have zones for. Troubleshooting may be more difficult and it will get terribly messy if you want subd2.company.com and subd3.company.com in the future.

The best solution will really depend on what company.com is currently doing and what you want it do. You also need to very clear that running the zone locally means you now have two possible places where DNS entries are. You should ensure you clearly understand your forwarders and so on.

Solution 2:

Yes it is possible. Just setup an A or MX record in the form *.subd.company.com. Any more specific answer is dependant on your DNS Server.