Private/Find-WhoisServer.ps1
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<# .SYNOPSIS Queries DNS for the WHOIS server for a domain name. .DESCRIPTION Function to lookup the WHOIS server for a domain name by querying the WHOIS DNS server for the TLD of the domain name. .NOTES Author: Robert D. Biddle Date: 2023-10-18 Find-WhoisServer - PowerShell function to lookup WHOIS server for a domain name. Copyright (C) 2023 Robert D. Biddle This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. .LINK https://github.com/RobBiddle/Get-WHOIS/ .EXAMPLE Find-WhoisServer -DomainName "whois-servers.net" This will return the following information: Address : 192.30.45.30 IPAddress : 192.30.45.30 QueryType : A IP4Address : 192.30.45.30 Name : whois.verisign-grs.com Type : A CharacterSet : Unicode Section : Answer DataLength : 4 TTL : 30 .PARAMETER DomainName The domain name to query in FQDN format. #> function Find-WhoisServer { [CmdletBinding()] param ( [Parameter(Mandatory = $true, ValueFromPipeline = $true, ValueFromPipelineByPropertyName = $true)] [ValidateScript({ if ($_ -match "^\b((?=[a-z0-9-]{1,63}\.)(xn--)?[a-z0-9]+(-[a-z0-9]+)*\.)+[a-z]{2,63}\b$") { $true } else { throw "Invalid DomainName format." } })] [string]$DomainName ) $tld = $DomainName.Split(".")[-1] $whoisDnsServersForTld = Resolve-DnsName "$tld.whois-servers.net" | Select-Object -Property * $whoisDnsServersForTld | Where-Object IPAddress } |