Is there a way to get a hostname from an IP address without depending on a DNS inquiry?

问题

I'm trying to write a script that depends on knowing the names of the computers on a network segment, but all the scripts I've found depend on a DNS inquiry which only replys with the names of a few of the machines. For example:

[System.Net.Dns]::GetHostbyAddress($IPAddress)

I've also tried using

Ping -a $ipaddress

but this often fails to return the machine name as well. Is there a way to ask the host what it's name is directly and what level of permissions might be required in AD to get a response?
Thanks in advance.

回答1:

You can try by using something like: Invoke-Command -computername $computer {Get-Item HKLM:\SYSTEM\ControlSet001\Control\ComputerName\ActiveComputerName} The active computername is equal to your DNS name (without suffix ofcourse)

回答2:

[System.Net.DNS]::GetHostByAddress() (now [System.Net.DNS]::GetHostEntry()) doesn't only rely on DNS, despite it's name. It will also check the local C:\Windows\System32\Drivers\etc\hosts file for locally configured entries.

straight dns via nslookup can't find the name:

PS C:\Users\Tim> nslookup 192.168.1.50
Server:  dns03
Address:  192.168.2.103

*** rpi03 can't find 192.168.1.50: Non-existent domain

yet, gethostentry() still finds the name:

PS C:\Users\Tim> [system.net.dns]::gethostentry('192.168.1.50')

HostName  Aliases AddressList
--------  ------- -----------
localentry {}      {192.168.1.50}

回答3:

I may misunderstand the problem but you can query the Win32_ComputerSystem instance using a CIM session to the remote computer and use one of those properties (Name, DNSName, etc.) Running locally it would be like

Get-CimInstance -namespace root/cimv2 -classname Win32_ComputerSystem | fl *

I'm aware that WMI might take fairly hefty permissions (e.g., domain admin) but (a) that might not be out of the question for your use case and (b) you might be able to do some limited querying with fewer permissions.

回答4:

Another idea might be to query your SCCM server if you have one:

(Get-WmiObject -Query "SELECT * from SMS_R_SYSTEM WHERE IPAddresses LIKE '%$ipaddress%'" -Namespace "root\sms\site_$SiteCode" -computerName $SCCMServer).Name

回答5:

You may get that from AD. Get-ADComputer <Computername> -Properties * | Select IPv4Address. See if you can make use of ADSISearcher and get IP Address using it. That way you won't need AD module.

来源：https://stackoverflow.com/questions/45242022/is-there-a-way-to-get-a-hostname-from-an-ip-address-without-depending-on-a-dns-i

标签

powershell

hostname