Get domain name

Question

My computer is in a Domain  Active Directory  and I need to get the domain name dynamically  I found the following code on the internet   SelectQuery query   new SelectQuery  Win32 ComputerSystem    using  ManagementObjectSearcher searcher   new ManagementObjectSearcher query         foreach  ManagementObject mo in searcher Get                  if   bool mo  partofdomain                          this Domain   mo  domain   ToString                break                       It works exactly as I want and returns exactly the domain name as I want  when I am logged as Administrator   If the user is not a Domain Admin  I have an Access denied exception   Does anybody know how to get the domain even with non-domain administrator users   NOTE  I have found this solution on Internet System Environment UserDomainName  but it only gives me a part of the domain name   I e  my domain is  something domain com and the UserDomainName returns only something

User · Answer

protected void Page Init object sender  EventArgs e        String hostdet   Request ServerVariables  HTTP HOST   ToString

User · Answer

Why are you using WMI  Can t you use the standard  NET functionality   System Net NetworkInformation IPGlobalProperties GetIPGlobalProperties   DomainName

User · Answer

I found this question by the title  If anyone else is looking for the answer on how to just get the domain name  use the following environment variable   System Environment UserDomainName   I m aware that the author to the question mentions this  but I missed it at the first glance and thought someone else might do the same   What the description of the question then ask for is the fully qualified domain name  FQDN

User · Answer

I m going to add an answer to try to clear up a few things here as there seems to be some confusion  The main issue is that people are asking the wrong question  or at least not being specific enough   What does a computer s  domain  actually mean   When we talk about a computer s  domain   there are several things that we might be referring to  What follows is not an exhaustive list  but it covers the most common cases    A user or computer security principal may belong to an Active Directory domain  The network stack s primary DNS search suffix may be referred to as the computer s  domain   A DNS name that resolves to the computer s IP address may be referred to as the computer s  domain     Which one do I want   This is highly dependent on what you are trying to do  The original poster of this question was looking for the computer s  Active Directory domain   which probably means they are looking for the domain to which either the computer s security principal or a user s security principal belongs  Generally you want these when you are trying to talk to Active Directory in some way  Note that the current user principal and the current computer principal are not necessarily in the same domain   Pieter van Ginkel s answer is actually giving you the local network stack s primary DNS suffix  the same thing that s shown in the top section of the output of ipconfig  all   In the 99  case  this is probably the same as the domain to which both the computer s security principal and the currently authenticated user s principal belong - but not necessarily  Generally this is what you want when you are trying to talk to devices on the LAN  regardless of whether or not the devices are anything to do with Active Directory  For many applications  this will still be a  good enough  answer for talking to Active Directory   The last option  a DNS name  is a lot fuzzier and more ambiguous than the other two  Anywhere between zero and infinity DNS records may resolve to a given IP address - and it s not necessarily even clear which IP address you are interested in  user2031519 s answer refers to the value of HTTP HOST  which is specifically useful when determining how the user resolved your HTTP server in order to send the request you are currently processing  This is almost certainly not what you want if you are trying to do anything with Active Directory   How do I get them   Domain of the current user security principal  This one s nice and simple  it s what Tim s answer is giving you   System Environment UserDomainName   Domain of the current computer security principal  This is probably what the OP wanted  for this one we re going to have to ask Active Directory about it   System DirectoryServices ActiveDirectory Domain GetComputerDomain     This one will throw a ActiveDirectoryObjectNotFoundException if the local machine is not part of domain  or the domain controller cannot be contacted   Network stack s primary DNS suffix  This is what Pieter van Ginkel s answer is giving you  It s probably not exactly what you want  but there s a good chance it s good enough for you - if it isn t  you probably already know why   System Net NetworkInformation IPGlobalProperties GetIPGlobalProperties   DomainName   DNS name that resolves to the computer s IP address  This one s tricky and there s no single answer to it  If this is what you are after  comment below and I will happily discuss your use-case and help you to work out the best solution  and expand on this answer in the process

User · Answer

I know this is old   I just wanted to dump this here for anyone that was looking for an answer to getting a domain name   This is in coordination with Peter s answer   There  is  a bug as stated by Rich   But  you can always make a simple workaround for that   The way I can tell if they are still on the domain or not is by pinging the domain name   If it responds  continue on with whatever it was that I needed the domain for   If it fails  I drop out and go into  offline  mode   Simple string method    string GetDomainName                 string  domain   IPGlobalProperties GetIPGlobalProperties   DomainName           Ping ping   new Ping             try                       PingReply reply   ping Send  domain                if  reply Status    IPStatus Success                                return  domain                            else                               return reply Status ToString                                    catch  PingException pExp                        if  pExp InnerException ToString       No such host is known                                 return  Network not detected                               return  Ping Exception

User · Answer

If you want specific users to have access to all or part of the WMI object space  you need to permission them as shown here   Note that you have to be running on as an admin to perform this setting

[c#] Get domain name

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