just a little heads up. every user that has Widnows 7 and a network not based on NAT, has IPv6 via tunnel. (windows sets it up for you (2001:0:: address)

http://ipv6.google.com
for one.

its HEX
so a-f and 0-9
8 sets off 4s

so 0000:0000:0000:0000:0000:0000:0000:0000 - ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

it can also be shorten down. like 0000 is written like this ::

so 0000:0000:0000:0000:0000:0000:0000:0000 is realy :: in short format

to put that in on a real ip context
2001:470:dc100::100
is short for 2001:0470:dc100:0000:0000:0000:0000:0100

so a zero at a start can be removed withouut adding a :
a full sets off 0 in a line 00000 is ::
:: can only be used onces so ::: is invalid

if you want to test ipv6 you can get a free tunnel from http://tunnelbroker.net/

(IPv6 in hex gives enough ips to every corn off sand ine the world, had it been a-z it would be every atom in the universe)

a few litte things that would be good.

Dont print ip in url so that i can mod it to only scan port like

http://domain/p.php?=9928

then it checks the remote_addr and prints out.

now it gives ip which gives the end user ability to scan others, which is a unwatned effect.

2nd

for ipv6
have it check the inputet add is ipv6
if so add []

bez to define a port in ipv6 it has to be in []

like 2001:470:dc100::100
is a valid ipv6
to define a port in there has to be like this [2001:470:dc46::2]:port

now when enter a straigt v6 it just adds the : at the end which is not a port but rather a new address lengt.

good code but missing one thing IPv6 support.
when i try to scan i ipv6 domain lik ipv6.google.com
it says closed even if i know its open

Worked when i updated php to 5.3.1