Recipe 6.27 Determining a User's Last Logon Time
You want to determine the last time a user logged into a domain.
18.104.22.168 Using a graphical user interface
If you install the AcctInfo.dll extension to Active Directory Users and Computers, you can view the last logon timestamp.
22.214.171.124 Using VBScript
' This code prints the last logon timestamp for a user. ' ------ SCRIPT CONFIGURATION ------ strUserDN = "<UserDN>" ' e.g. cn=rallen,ou=Sales,dc=rallencorp,dc=com ' ------ END CONFIGURATION --------- set objUser = GetObject("LDAP://" & strUserDN) set objLogon = objUser.Get("lastLogonTimestamp") intLogonTime = objLogon.HighPart * (2^32) + objLogon.LowPart intLogonTime = intLogonTime / (60 * 10000000) intLogonTime = intLogonTime / 1440 WScript.Echo "Approx last logon timestamp: " & intLogonTime + #1/1/1601#
Trying to determine when a user last logged on has always been a challenge in the Microsoft NOS environment. In Windows NT, you could retrieve a user's last logon timestamp from a PDC or BDC, but this timestamp was the last time the user logged on to the PDC or BDC. That means in order to determine the actual last logon, you'd have to query every domain controller in the domain. In large environments, this wasn't practical. With Windows 2000 Active Directory, things did not improve much. A lastLogon attribute is used to store the last logon timestamp, but unfortunately, this attribute isn't replicated. So again, to get an accurate picture, you'd have to query every domain controller in the domain for the user's last logon attribute and keep track of the most recent one.
Now with Windows Server 2003, we finally have a viable solution. A new attribute was added to the schema for user objects called lastLogonTimestamp. This attribute is similar to the lastLogon attribute that was available previously, with two distinct differences. First, and most importantly, this attribute is replicated. That means when a user logs in, the lastLogonTimestamp attribute will get populated and then replicate to all domain controllers in the domain.
The second difference is that since lastLogonTimestamp is replicated, special safeguards needed to be put in place so that users that logged in repeatedly over a short period of time did not cause unnecessary replication traffic. For this reason, the lastLogonTimestamp is updated only if the last update occurred a week or more ago. This means that the lastLogonTimestamp attribute could be up to a week off in terms of accuracy with a user's actual last logon. Ultimately, this shouldn't be a problem for most situations because lastLogonTimestamp is intended to address the common problem where administrators want to run a query and determine which users have not logged in over the past month or more.
6.27.4 See Also
Recipe 6.28 for finding users that have not logged on recently