[Konstantinos]

pawn Код:

new
    Player_Ip[ MAX_PLAYERS ][ 16 ]
;

// OnPlayerConnect:
GetPlayerIp( playerid, Player_Ip[ playerid ], 16 );

// Anywhere else you want to use the IP (such as passing it as an argument to format):
Player_Ip[ playerid ]

Everytime I used to get the IP at localhost, 255.255.255.255 was returned. I fixed the problem by getting the IP only ONCE and using it then