Saturday, July 25, 2009

How to identify user's country by ip

In a 4 steps u can identify the user's country
u will discover that it is a very easy assignment

step 1:
-------
Download the txt file from here, that represent the ip ranges of each country. when u save this file change his extension to csv.

step 2:
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Import the csv file into your db and create table with the name [ip-to-country].

step 3:
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By taking the user's IP with Request.UserHostAddress convert this string to uint by this function:

public uint IPAddressToLongBackwards(string IPAddr)
{
System.Net.IPAddress oIP = System.Net.IPAddress.Parse(IPAddr);
byte[] byteIP = oIP.GetAddressBytes();

uint ip = (uint)byteIP[0] << 24;
ip += (uint)byteIP[1] << 16;
ip += (uint)byteIP[2] << 8;
ip += (uint)byteIP[3];

return ip;
}


step 4:
-------
with this ip address (as uint) go to our [ip-to-country] table and select the country by this sql query(@ip is the uint ip address):

SELECT countryCode2
from [ip-to-country]
where ipFrom <= @ip
and ipTo >= @ip

3 comments:

Anonymous said...

hi..
In my guess IP ranges served for a country do change ! so i guess db needs to be updated every month if necessary..

Yours Truly said...

תודה על הטיפ!
עכשיו רק תגיד איך אני משתמש בקוד הזה בשביל לסנן מבקרים מבת-ים :-)

Yosi Havia said...

אתה פשוט צריך לשאול בכניסה: יש כאן מישהו מבת ים???