To show Mac & Ip Address in Captive portal Page (tutorial)
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 // GEt ip address 
 $ipaddress=$_SERVER['REMOTE_ADDR'];
 $macaddr=false;// Run arp request 
 $arp=arp $ipaddress;
 // breaks arp & get mac from it
 $lines = explode(" ", $arp);
 $macaddr = $lines[3];// Display Mac & IP address 
 echo $macaddr;echo $ipaddress; ?> 
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 Hello, What command can I use to show hostname? I saw 
 $hostname = gethostbyaddr($ipaddress);
 mentioned somewhere, but it does not appear to work.pfSense 2.1 beta 1 amd64 Regards 
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 I am afraid I should have made the question more specific. I was referring to the context of displaying hostname in PHP, khan had posted how to display ipaddress and macaddress using php script. I wanted hostname also to be displayed in the above process. Does arp explode give a hostname in the output? If so how to retrieve it? Thanks for your time. kmnair 
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 Did you try using the captive portal function instead of your own callout to arp? In /usr/local/captiveportal/index.php I see: $clientip = $_SERVER['REMOTE_ADDR']; 
 $clientmac = arp_get_mac_by_ip($clientip);That function is in /etc/inc/util.inc. It does things like try to ping $clientip first to repopulate the arp table if necessary and check the result with is_macaddr(). 
