Whois 简单来说，就是一个用来查询域名是否已经被注册，以及注册域名的详细信息的数据库（如域名所有人、域名注册商、域名注册日期和过期日期等）。通过域名Whois服务器查询，可以查询域名归属者联系方式，以及注册和到期时间。通常情况下，whois信息均为真实信息，通过whois信息可以找到域名注册人的很多真实信息，像电话，邮箱，NS记录，是对网站进行社工非常好的信息来源，对于安全从业人员来说，快速获取whois信息，能够帮助自己掌握目标网站的很多有用信息。
而whois信息通常是保存在各级域名注册机构中，平常我们要查询whois信息都是通过godaddy、name.com、万网、新网等域名注册商网站通过查询页面提交域名进行查询，既慢又不能批量查询，太费劲了，这里我就把我珍藏很久的一个PS function贡献给大家，这个脚本支持140多种后缀的域名进行查询，尤其是一些生僻的域，找一个能支持这个域注册的注册商就不容易了，现在你不需要再为这个事情发愁了。
老规矩，先上代码，然后对关键操作进行解释：
=====文件名：Get-whois.ps1===== function Get-WhoIs { <# Author:fuhj(powershell#live.cn ,http://fuhaijun.com) # Does a raw WHOIS query and returns the results # The simplest whois search #.Example # get-whois dnspod.com # # This example is one that forwards to a second whois server ... #.Example # get-whois baidu.com -NoForward # # Returns the partial results you get when you don't follow forwarding to a new whois server # get-whois n 128.11.5.98 -server whois.arin.net # # Does an ip lookup at arin.net #> [CmdletBinding()] param( # The query to send to WHOIS servers [Parameter(Position=0, ValueFromRemainingArguments=$true)] [string]$query, # A specific whois server to search [string]$server, # Disable forwarding to new whois servers [switch]$NoForward ) end { $TLDs = DATA { @{ ".com"= "whois.verisign-grs.com","whois.crsnic.net" ".net"= "whois.verisign-grs.com","whois.crsnic.net" ".org"= "whois.pir.org","whois.publicinterestregistry.net" ".info"= "whois.afilias.info","whois.afilias.net" ".biz"= "whois.neulevel.biz" ".us"= "whois.nic.us" ".uk"= "whois.nic.uk" ".ca"= "whois.cira.ca" ".tel"= "whois.nic.tel" ".ie"= "whois.iedr.ie","whois.domainregistry.ie" ".it"= "whois.nic.it" ".li"= "whois.nic.li" ".no"= "whois.norid.no" ".cc"= "whois.nic.cc" ".eu"= "whois.eu" ".nu"= "whois.nic.nu" ".au"= "whois.aunic.net","whois.ausregistry.net.au" ".de"= "whois.denic.de" ".ws"= "whois.worldsite.ws","whois.nic.ws","www.nic.ws" ".sc"= "whois2.afilias-grs.net" ".mobi" = "whois.dotmobiregistry.net" ".pro"= "whois.registrypro.pro","whois.registry.pro" ".edu"= "whois.educause.net","whois.crsnic.net" ".tv"= "whois.nic.tv","tvwhois.verisign-grs.com" ".travel" = "whois.nic.travel" ".name" = "whois.nic.name" ".in"= "whois.inregistry.net","whois.registry.in" ".me"= "whois.nic.me","whois.meregistry.net" ".at"= "whois.nic.at" ".be"= "whois.dns.be" ".cn"= "whois.cnnic.cn","whois.cnnic.net.cn" ".edu.cn"="whois.edu.cn" ".asia"= "whois.nic.asia" ".ru"= "whois.ripn.ru","whois.ripn.net" ".ro"= "whois.rotld.ro" ".aero" = "whois.aero" ".fr"= "whois.nic.fr" ".se"= "whois.iis.se","whois.nic-se.se","whois.nic.se" ".nl"= "whois.sidn.nl","whois.domain-registry.nl" ".nz"= "whois.srs.net.nz","whois.domainz.net.nz" ".mx"= "whois.nic.mx" ".tw"= "whois.apnic.net","whois.twnic.net.tw" ".ch"= "whois.nic.ch" ".hk"= "whois.hknic.net.hk" ".ac"= "whois.nic.ac" ".ae"= "whois.nic.ae" ".af"= "whois.nic.af" ".ag"= "whois.nic.ag" ".al"= "whois.ripe.net" ".am"= "whois.amnic.net" ".as"= "whois.nic.as" ".az"= "whois.ripe.net" ".ba"= "whois.ripe.net" ".bg"= "whois.register.bg" ".bi"= "whois.nic.bi" ".bj"= "www.nic.bj" ".br"= "whois.nic.br" ".br.com"="whois.centralnic.net" ".eu.org"="whois.eu.org" ".bt"= "whois.netnames.net" ".by"= "whois.ripe.net" ".bz"= "whois.belizenic.bz" ".cd"= "whois.nic.cd" ".ck"= "whois.nic.ck" ".cl"= "nic.cl" ".coop"= "whois.nic.coop" ".cx"= "whois.nic.cx" ".cy"= "whois.ripe.net" ".cz"= "whois.nic.cz" ".dk"= "whois.dk-hostmaster.dk" ".dm"= "whois.nic.cx" ".dz"= "whois.ripe.net" ".ee"= "whois.eenet.ee" ".eg"= "whois.ripe.net" ".es"= "whois.ripe.net" ".fi"= "whois.ficora.fi" ".fo"= "whois.ripe.net" ".gb"= "whois.ripe.net" ".ge"= "whois.ripe.net" ".gl"= "whois.ripe.net" ".gm"= "whois.ripe.net" ".gov"= "whois.nic.gov" ".gr"= "whois.ripe.net" ".gs"= "whois.adamsnames.tc" ".hm"= "whois.registry.hm" ".hn"= "whois2.afilias-grs.net" ".hr"= "whois.ripe.net" ".hu"= "whois.ripe.net" ".il"= "whois.isoc.org.il" ".int"= "whois.isi.edu" ".iq"= "vrx.net" ".ir"= "whois.nic.ir" ".is"= "whois.isnic.is" ".je"= "whois.je" ".jp"= "whois.jprs.jp" ".kg"= "whois.domain.kg" ".kr"= "whois.nic.or.kr" ".la"= "whois2.afilias-grs.net" ".lt"= "whois.domreg.lt" ".lu"= "whois.restena.lu" ".lv"= "whois.nic.lv" ".ly"= "whois.lydomains.com" ".ma"= "whois.iam.net.ma" ".mc"= "whois.ripe.net" ".md"= "whois.nic.md" ".mil"= "whois.nic.mil" ".mk"= "whois.ripe.net" ".ms"= "whois.nic.ms" ".mt"= "whois.ripe.net" ".mu"= "whois.nic.mu" ".my"= "whois.mynic.net.my" ".nf"= "whois.nic.cx" ".pl"= "whois.dns.pl" ".pr"= "whois.nic.pr" ".pt"= "whois.dns.pt" ".sa"= "saudinic.net.sa" ".sb"= "whois.nic.net.sb" ".sg"= "whois.nic.net.sg" ".sh"= "whois.nic.sh" ".si"= "whois.arnes.si" ".sk"= "whois.sk-nic.sk" ".sm"= "whois.ripe.net" ".st"= "whois.nic.st" ".su"= "whois.ripn.net" ".tc"= "whois.adamsnames.tc" ".tf"= "whois.nic.tf" ".th"= "whois.thnic.net" ".tj"= "whois.nic.tj" ".tk"= "whois.nic.tk" ".tl"= "whois.domains.tl" ".tm"= "whois.nic.tm" ".tn"= "whois.ripe.net" ".to"= "whois.tonic.to" ".tp"= "whois.domains.tl" ".tr"= "whois.nic.tr" ".ua"= "whois.ripe.net" ".uy"= "nic.uy" ".uz"= "whois.cctld.uz" ".va"= "whois.ripe.net" ".vc"= "whois2.afilias-grs.net" ".ve"= "whois.nic.ve" ".vg"= "whois.adamsnames.tc" ".yu"= "whois.ripe.net" } } $EAP, $ErrorActionPreference = $ErrorActionPreference, "Stop" $query = $query.Trim() if($query -match "(?:d{1,3}.){3}d{1,3}") { Write-Verbose "IP Lookup!" if($query -notmatch " ") { $query = "n $query" } if(!$server) { $server = "whois.arin.net" } } elseif(!$server) { $server = $TLDs.GetEnumerator() | Where { $query -like ("*"+$_.name) } | Select -Expand Value | Get-Random } if(!$server) { $server = "whois.arin.net" } $maxRequery = 3 do { Write-Verbose "Connecting to $server" $client = New-Object System.Net.Sockets.TcpClient $server, 43 try { $stream = $client.GetStream() Write-Verbose "Sending Query: $query" $data = [System.Text.Encoding]::Ascii.GetBytes( $query + "`r`n" ) $stream.Write($data, 0, $data.Length) Write-Verbose "Reading Response:" $reader = New-Object System.IO.StreamReader $stream, [System.Text.Encoding]::ASCII $result = $reader.ReadToEnd() if($result -match "(?s)Whois Server:s*(S+)s*") { Write-Warning "Recommended WHOIS server: ${server}" if(!$NoForward) { Write-verbose "Non-Authoritative Results:`n${result}" # cache, in case we can't get an answer at the forwarder if(!$cachedResult) { $cachedResult = $result $cachedServer = $server } $server = $matches[1] $query = ($query -split " ")[-1] $maxRequery-- } else { $maxRequery = 0 } } else { $maxRequery = 0 } } finally { if($stream) { $stream.Close() $stream.Dispose() } } } while ($maxRequery -gt 0) $result if($cachedResult -and ($result -split "`n").count -lt 5) { Write-Warning "Original Result from ${cachedServer}:" $cachedResult } $ErrorActionPreference = $EAP } }
函数里定义了三个参数，两个[string]类型，一个[switch]类型，分别用于接收要进行whois查询的域名，指定whois域名服务器，以及是否允许将查询请求转发到其他域名解析服务器。随后创建了一个枚举值的哈希表，目的是用于存储不同域名后缀和whois服务器的对应关系，因为不同的域名后缀对应的域名信息是存储在不同的服务器上的。需要强调的是像.com、.net、.org、.info这几个注册量特别大的域名后缀指定了多个whois服务器，避免查询量过大无法有效返回结果的问题。
接下来通过New-Object创建一个System.Net.Sockets.TcpClient的TCP对象，连接上面指定的whois服务器的43端口用于查询whois信息，在通过一个System.IO.StreamReader对象接收whois信息返回的数据，并对数据进行解析。除此之外再加上try{}cache{}finally{}进行容错处理，在数据解析是也用到了正则表达式用于匹配目标字符串。
程序的运行方法有如下四种：
get-whois dnspod.com
先看看dnspod在被腾讯收购后有没有更改whois信息，貌似鹅厂没有改过
get-whois jd.com –NoForward
get-whois n 128.11.5.98 -server whois.arin.net
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