Powershell: Get FQDN Hostname

Question

I want to retrieve the FQDN name of windows server via powershell script. I have found 2 solution so far:

$server =  Invoke-Command -ScriptBlock {hostname}
         


        

Answer 1

[System.Net.Dns]::GetHostByName((hostname)).HostName

$env:computerName returns NetBIOS name of the host, so that both previous examples return netbioshostname.domainsuffix (not FQDN!) instead of dnshostname.domainsuffix (FQDN)

for example, host has FQDN aa-w2k12sv-storage.something.com and NetBIOS name aa-w2k12sv-stor (an easy case, I usually change NetBIOS name)

the hostname utility returns dnshostname, i.e., the first part of FQDN and code

[System.Net.Dns]::GetHostByName((hostname)).HostName

returns the right FQDN

Comment: never use the same NetBIOS and DNS names of AD domains and hosts. If your or 3rd party application writes to the log: "cannot connect to hostname.domainsuffix", what name it tries to resolve? If you see in the log "cannot connect to netbiosname.domainsuffix", no doubt, a lazy programmer added domain suffix to the NetBIOS name and you are sure, this is a bug, and can open a ticket to force them to fix the issue...