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Manual: gethostbyaddr
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gethostbyaddr

(PHP3 , PHP4 )

gethostbyaddr --  指定したIPアドレスに対応するインターネットホスト名を取得する

説明

string gethostbyaddr (string ip_address)

ip_addressで指定したインターネットホストの ホスト名を返します。エラーが発生した場合、 ip_addressを返します。

gethostbyname()も参考にしてください。


User Contributed Notes: gethostbyaddr

php3@bigsky.net
15-Mar-2000 04:34
To check a host's address:
<pre>
$r_hostname = gethostbyaddr($REMOTE_ADDR);
if ($REMOTE_ADDR == "$r_hostname") {
....
}
</pre>

This will fail if a lookup on the name returns the IP as the domain name (which can happen if you control a DNS server), but it's a pretty contrived example, and in any other case it will work.

crusher66@hotmail.com
04-Apr-2000 05:31
Prepend the function with "@" to supress
any error...
<pre>
$r_hostname = @gethostbyaddr($REMOTE_ADDR);
</pre>

scott.kavanagh@netiq.com
11-Aug-2000 03:01
When using the function I am occasionaly seeing a peculiar result on win2k machines.

Specifically, extra characters are returned in front of the hostname. For example if the actual host name is 'blue' I might actually get 'is~blue'.

This may be a peculiar behavior of win2k or perhaps some domain DHCP, etc configuration. Or maybe its a browser issue (i.e. IE5.5 & Win2k).

For now I am just stripping off everything before and including '~'

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