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Reverse DNS Lookup tools

The Reverse DNS lookup tools are the same as the regular DNS tools. For Windows OS, the easiest way to check the Reverse DNS records of a domain is the “nslookup” command.

Reverse DNS lookup in Windows

Method 1:

nslookup 95.234.212.187

result:

Name: host187-212-dynamic.234-95-r.retail.telecomitalia.it
Address: 95.234.212.187

Note: if you use DNS server like figure below

you take the result:

Server: google-public-dns-a.google.com
Address: 8.8.8.8

Name: host187-212-dynamic.234-95-r.retail.telecomitalia.it
Address: 95.234.212.187

Test code PHP: we use exec function:

exec('nslookup 95.234.212.187',$result);

var_dump($result);

Result:

array(6) {
[0]=>
string(39) “Server: google-public-dns-a.google.com”
[1]=>
string(17) “Address: 8.8.8.8”
[2]=>
string(0) “”
[3]=>
string(61) “Name: host187-212-dynamic.234-95-r.retail.telecomitalia.it”
[4]=>
string(24) “Address: 95.234.212.187”
[5]=>
string(0) “”
}

To check the reverse DNS:

foreach ($result as $line)
{
    if (preg_match("/^Name:(.*?)$/", $line, $match))
    {
        echo 'Reserve DNS: ' . trim($match[1]);
        break;
    }
}

result we take:

Reserve DNS: host187-212-dynamic.234-95-r.retail.telecomitalia.it

Method 2:: You can use ping command:

ping -a 98.139.183.24

result:

Pinging ir2.fp.vip.bf1.yahoo.com [98.139.183.24] with 32 bytes of data:
Reply from 98.139.183.24: bytes=32 time=806ms TTL=37
Reply from 98.139.183.24: bytes=32 time=766ms TTL=37
Reply from 98.139.183.24: bytes=32 time=735ms TTL=37
Reply from 98.139.183.24: bytes=32 time=801ms TTL=37

Ping statistics for 98.139.183.24:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 735ms, Maximum = 806ms, Average = 777ms

Reverse DNS lookup in Linux

Method 1:
We use “host” command to check the reverse DNS:

exec('host 95.234.212.187',$result);

var_dump($result);

Result:

array(1) {
[0]=>
string(101) “187.212.234.95.in-addr.arpa domain name pointer host187-212-dynamic.234-95-r.retail.telecomitalia.it.”
}

To check the reverse DNS:

echo 'Reverse DNS: ' . trim(preg_replace("/^.*?domain name pointer(.*?)$/", "$1", $result[0]), ". ");

result we take:

Reserve DNS: host187-212-dynamic.234-95-r.retail.telecomitalia.it

Method 2:
Use this command:

host 220.220.220.220 | grep -o '[^ ]\+$' | sed s/\.$//

Result:

i220-220-220-220.s41.a013.ap.plala.or.jp

Method 3: use dig command:

dig +short -x "220.220.220.220"  | sed s/\.$//

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