Resolving hostnames on network using PowerShell

Question

8 | foreach {
    New-Object PSObject -Prop @{
        Address ="192.168.1.$_";
        Status = (Test-Connection "192.168.1.$_" -Quiet -Count 1);
        try {HostName=[System.Net.Dns]::GetHostEntry("192.168.1.$_").HostName} catch {HostName="UNKNOWN"}
    }
} | Format-Table -Auto

I want to resolve the hostnames using [System.Net.Dns]::GetHostEntry(). I am using Test-Connection to get the connection status.

My problem is that when a host name cannot be resolved, the command returns an error. I need to store "UNKNOWN " in the HostName property for that particular member, is there any construct that i can use to achieve this?

pipe lining 8 because my mobile is connected on 192.168.1.8

Srihari Humbarwadi
– Srihari Humbarwadi

2017-01-09 15:52:11 +00:00
Commented Jan 9, 2017 at 15:52 — Srihari Humbarwadi
– Srihari Humbarwadi, Commented Jan 9, 2017 at 15:52

BenH · Accepted Answer · 2017-01-09 16:13:01Z

2

Put the Try/Catch after you start defining HostName.

8 | foreach {
    new-object psobject -prop @{
        Address = "192.168.1.$_"
        Status = Test-connection "192.168.1.$_" -quiet -count 1
        HostName = Try {[System.Net.Dns]::gethostentry("192.168.1.$_").HostName} Catch {"UNKNOWN"}
    }
} | format-table -auto

answered Jan 9, 2017 at 16:13

BenH

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8 Comments

Srihari Humbarwadi Over a year ago

I tried this, it keeps printing UNKNOWN at the end of the table, i want it to store UNKNOWN under HostName

Ansgar Wiechers Over a year ago

@SrihariHumbarwadi The code should do exactly what you're asking. Please provide evidence.

user6811411 Over a year ago

@SrihariHumbarwadi works here as expected. I defined a var ' $IP = "192.168.1.$_" ' and replaced the 3 occurences of the IP with $IP

Srihari Humbarwadi Over a year ago

8 | foreach {$address="192.168.1.$_";new-object psobject -prop @{Address =$address;Status =(Test-connection $address -quiet -count 1);HostName=try{[System.Net.Dns]::gethostentry($address). HostName} catch {Return UNKNOWN} }}

Srihari Humbarwadi Over a year ago

^ ran this UNKNOWN : The term 'UNKNOWN' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.

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