I want to integrate one API with one of my website which is a task given by my senior.The API is about searching domain name already present or not..please help me on this topic please give me n example which i can refer.my website is in PHP.
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Answer
[EDIT 2] As @Poe mentions in his comment, gethostbyname is probably a much better solution because it works for any top level domain, since it performs a DNS query instead of a whois query, and is also much simpler to implement and probably faster:
<?php
$ip = gethostbyname('example.com');
if (strstr($ip,"example.com")){
echo "No match for domain example.com<br />n";
} else {
echo "Domain found. Query output: <br />n".$ip;
}
?>
Anyway, a domain can be registered but its not linked to any computer (E.g. although it’s very uncommon, you may get an resolution for www.example.com but not example.com)
[EDIT] I didn’t post this before because I was having some trouble connecting to whois.internic.net on port 43 to perform a whois query (thought they had shutdown the service for good). Anyway, here’s a fsockopen based solution I just coded, which I think is far better and simpler than the solution I gave before using their CGI web script. Hope it helps (Usage: myqueryscript.php?domain=domainiwanttocheck.com):
<?php
$fp = fsockopen("199.7.58.74", 43, $errno, $errstr, 30);
if (!$fp) {
echo "$errstr ($errno)<br />n";
} else {
$query = $_GET['domain']."rn";
$answer= '';
fwrite($fp, $query);
while (!feof($fp)) {
$answer .= fgets($fp, 128)."<br />";
}
fclose($fp);
if (strstr($answer,"No match for")){
echo "No match for domain ".$_GET['domain']."<br />n";
} else {
echo "Domain found. Query output: <br />n".$answer;
}
}
?>
From internic website, this is the html code to implement a whois query:
<form method="get" action="http://reports.internic.net/cgi/whois" name="my_form">
<input type="text" size="30" name="whois_nic" maxlength="80">
<br>
<input type="radio" name="type" value="domain" checked>
Domain<font size="-1"> (ex. internic.net)
<br>
<input type="radio" name="type" value="registrar">
Registrar<font size="-1"> (ex. ABC Registrar, Inc.)
<br>
<input type="radio" name="type" value="nameserver">
Nameserver (ex. NS.EXAMPLE.COM or 192.16.0.192)<br>
<br>
<input type="submit" value="Submit">
</form>
This means you can send a whois query like this: http://reports.internic.net/cgi/whois?whois_nic=domainiwanttocheck.com&type=domain
You can send the query from your script and store the response on a DOMDocument object. Check out: http://www.php.net/manual/en/domdocument.loadhtml.php
If you use this method to lookup a domain and the domain doesn’t exist, you’ll get the string No match for domain. Look for this in the response using strpos
If the domain exists, you can filter the response to include the info about registrar, etc. It will be the content of the html tag <pre> of the response:
<pre>
Whois Server Version 2.0
Domain names in the .com and .net domains can now be registered
with many different competing registrars. Go to http://www.internic.net
for detailed information.
Domain Name: GOOGLE.COM
Registrar: MARKMONITOR INC.
Whois Server: whois.markmonitor.com
Referral URL: http://www.markmonitor.com
Name Server: NS1.GOOGLE.COM
Name Server: NS2.GOOGLE.COM
Name Server: NS3.GOOGLE.COM
Name Server: NS4.GOOGLE.COM
Status: clientDeleteProhibited
Status: clientTransferProhibited
Status: clientUpdateProhibited
Status: serverDeleteProhibited
Status: serverTransferProhibited
Status: serverUpdateProhibited
Updated Date: 20-jul-2011
Creation Date: 15-sep-1997
Expiration Date: 14-sep-2020
>>> Last update of whois database: Sat, 25 Aug 2012 10:15:09 UTC <<<
NOTICE: The expiration date displayed in this record is the date the
registrar's sponsorship of the domain name registration in the registry is
currently set to expire. This date does not necessarily reflect the expiration
date of the domain name registrant's agreement with the sponsoring
registrar. Users may consult the sponsoring registrar's Whois database to
view the registrar's reported date of expiration for this registration.
TERMS OF USE: You are not authorized to access or query our Whois
database through the use of electronic processes that are high-volume and
automated except as reasonably necessary to register domain names or
modify existing registrations; the Data in VeriSign Global Registry
Services' ("VeriSign") Whois database is provided by VeriSign for
information purposes only, and to assist persons in obtaining information
about or related to a domain name registration record. VeriSign does not
guarantee its accuracy. By submitting a Whois query, you agree to abide
by the following terms of use: You agree that you may use this Data only
for lawful purposes and that under no circumstances will you use this Data
to: (1) allow, enable, or otherwise support the transmission of mass
unsolicited, commercial advertising or solicitations via e-mail, telephone,
or facsimile; or (2) enable high volume, automated, electronic processes
that apply to VeriSign (or its computer systems). The compilation,
repackaging, dissemination or other use of this Data is expressly
prohibited without the prior written consent of VeriSign. You agree not to
use electronic processes that are automated and high-volume to access or
query the Whois database except as reasonably necessary to register
domain names or modify existing registrations. VeriSign reserves the right
to restrict your access to the Whois database in its sole discretion to ensure
operational stability. VeriSign may restrict or terminate your access to the
Whois database for failure to abide by these terms of use. VeriSign
reserves the right to modify these terms at any time.
The Registry database contains ONLY .COM, .NET, .EDU domains and
Registrars.
</pre>
Also, check out this related question: Who provides a WHOIS API?