ASP.NET C# Ip to country name and flag

Below code will display country flag of an ip.

It can be modified to display country name too.
Code is build on c# class found at http://www.maxmind.com/app/csharp and uses data from http://www.maxmind.com/app/geolitecountry

You need to download http://geolite.maxmind.com/download/geoip/database/GeoLiteCountry/GeoIP.dat.gz and extract it to same folder with your aspx page (try winrar to extract .gz files)

You also need to download flag icons from http://www.famfamfam.com/lab/icons/flags/ and extract in to flags folder



Upload it to your server and call it like
<img src="iptoflag.aspx?ip=IPHERE" alt="" />


iptoflag.aspx

protected void Page_Load(object sender, EventArgs e)
{
string visitorIp = ReturnAlphaNumeric(Request.QueryString["ip"]);
if (visitorIp==null)
visitorIp = Request.ServerVariables["REMOTE_ADDR"];

Response.StatusCode = 200;
Response.Cache.SetExpires(DateTime.Now.AddMinutes(10));
Response.Cache.SetCacheability(HttpCacheability.Public);


try
{
Response.ContentType = "image/png";

FileStream flag = new FileStream(Server.MapPath("flags/" + GetCountryFlag(visitorIp) + ".png"), FileMode.Open, FileAccess.Read, FileShare.Read);
long FileSize;
FileSize = flag.Length;
byte[] getContent = new byte[(int)FileSize];
flag.Read(getContent, 0, (int)flag.Length);
flag.Close();
Response.BinaryWrite(getContent);

}
catch (Exception ee)
{
Response.ContentType = "text/html";
Response.Write(ee.ToString());
}

}

public static string ReturnAlphaNumeric(string input)
{
try
{
return Regex.Replace(input, @"[^0-9\.]", "").ToString();
}
catch
{
return "127.0.0.1";
}
}

public static string GetCountryFlag(string ip)
{
string cc = "-";
//string cn = "Unknown";

using (CountryLookup cl = new CountryLookup(HttpContext.Current.Server.MapPath("GeoIP.dat")))
{
try
{
cc = cl.lookupCountryCode(ip);
}
catch (Exception ex)
{
cc = "-";
}
}

return cc;

}

public class CountryLookup : IDisposable
{

private FileStream fileInput;
private bool _close;
private static long COUNTRY_BEGIN = 16776960;
private static string[] countryCode = 
{ "-","AP","EU","AD","AE","AF","AG","AI","AL","AM","AN","AO","AQ","AR","AS","AT","AU","AW","AZ","BA","BB","BD","BE","BF","BG","BH","BI","BJ","BM","BN","BO","BR","BS","BT","BV","BW","BY","BZ","CA","CC","CD","CF","CG","CH","CI","CK","CL","CM","CN","CO","CR","CU","CV","CX","CY","CZ","DE","DJ","DK","DM","DO","DZ",
"EC","EE","EG","EH","ER","ES","ET","FI","FJ","FK","FM","FO","FR","FX","GA","GB","GD","GE","GF","GH","GI","GL","GM","GN","GP","GQ","GR","GS","GT","GU","GW","GY","HK","HM","HN","HR","HT","HU","ID","IE","IL","IN","IO","IQ","IR","IS","IT","JM","JO","JP","KE","KG","KH","KI","KM","KN","KP","KR","KW","KY","KZ",
"LA","LB","LC","LI","LK","LR","LS","LT","LU","LV","LY","MA","MC","MD","MG","MH","MK","ML","MM","MN","MO","MP","MQ","MR","MS","MT","MU","MV","MW","MX","MY","MZ","NA","NC","NE","NF","NG","NI","NL","NO","NP","NR","NU","NZ","OM","PA","PE","PF","PG","PH","PK","PL","PM","PN","PR","PS","PT","PW","PY","QA",
"RE","RO","RU","RW","SA","SB","SC","SD","SE","SG","SH","SI","SJ","SK","SL","SM","SN","SO","SR","ST","SV","SY","SZ","TC","TD","TF","TG","TH","TJ","TK","TM","TN","TO","TL","TR","TT","TV","TW","TZ","UA","UG","UM","US","UY","UZ","VA","VC","VE","VG","VI","VN","VU","WF","WS","YE","YT","RS","ZA","ZM","ME","ZW","A1","A2",
"O1","AX","GG","IM","JE","BL","MF"
};
private static string[] countryName = 
{"Unknown","Asia/Pacific Region","Europe","Andorra","United Arab Emirates","Afghanistan","Antigua and Barbuda","Anguilla","Albania","Armenia","Netherlands Antilles","Angola","Antarctica","Argentina","American Samoa","Austria","Australia","Aruba","Azerbaijan","Bosnia and Herzegovina","Barbados","Bangladesh","Belgium",
"Burkina Faso","Bulgaria","Bahrain","Burundi","Benin","Bermuda","Brunei Darussalam","Bolivia","Brazil","Bahamas","Bhutan","Bouvet Island","Botswana","Belarus","Belize","Canada","Cocos (Keeling) Islands","Congo, The Democratic Republic of the","Central African Republic","Congo","Switzerland","Cote D'Ivoire",
"Cook Islands","Chile","Cameroon","China","Colombia","Costa Rica","Cuba","Cape Verde","Christmas Island","Cyprus","Czech Republic","Germany","Djibouti","Denmark","Dominica","Dominican Republic","Algeria","Ecuador","Estonia","Egypt","Western Sahara","Eritrea","Spain","Ethiopia","Finland","Fiji","Falkland Islands (Malvinas)",
"Micronesia, Federated States of","Faroe Islands","France","France, Metropolitan","Gabon","United Kingdom","Grenada","Georgia","French Guiana","Ghana","Gibraltar","Greenland","Gambia","Guinea","Guadeloupe","Equatorial Guinea","Greece","South Georgia and the South Sandwich Islands","Guatemala","Guam","Guinea-Bissau","Guyana",
"Hong Kong","Heard Island and McDonald Islands","Honduras","Croatia","Haiti","Hungary","Indonesia","Ireland","Israel","India","British Indian Ocean Territory","Iraq","Iran, Islamic Republic of","Iceland","Italy","Jamaica","Jordan","Japan","Kenya","Kyrgyzstan","Cambodia","Kiribati","Comoros","Saint Kitts and Nevis",
"Korea, Democratic People's Republic of","Korea, Republic of","Kuwait","Cayman Islands","Kazakstan","Lao People's Democratic Republic","Lebanon","Saint Lucia","Liechtenstein","Sri Lanka","Liberia","Lesotho","Lithuania","Luxembourg","Latvia","Libyan Arab Jamahiriya","Morocco","Monaco","Moldova, Republic of","Madagascar",
"Marshall Islands","Macedonia","Mali","Myanmar","Mongolia","Macau","Northern Mariana Islands","Martinique","Mauritania","Montserrat","Malta","Mauritius","Maldives","Malawi","Mexico","Malaysia","Mozambique","Namibia","New Caledonia","Niger","Norfolk Island","Nigeria","Nicaragua","Netherlands",
"Norway","Nepal","Nauru","Niue","New Zealand","Oman","Panama","Peru","French Polynesia","Papua New Guinea","Philippines","Pakistan","Poland","Saint Pierre and Miquelon","Pitcairn Islands","Puerto Rico","Palestinian Territory","Portugal","Palau","Paraguay","Qatar","Reunion","Romania","Russian Federation","Rwanda","Saudi Arabia",
"Solomon Islands","Seychelles","Sudan","Sweden","Singapore","Saint Helena","Slovenia","Svalbard and Jan Mayen","Slovakia","Sierra Leone","San Marino","Senegal","Somalia","Suriname","Sao Tome and Principe","El Salvador","Syrian Arab Republic","Swaziland","Turks and Caicos Islands","Chad","French Southern Territories","Togo",
"Thailand","Tajikistan","Tokelau","Turkmenistan","Tunisia","Tonga","Timor-Leste","Turkey","Trinidad and Tobago","Tuvalu","Taiwan","Tanzania, United Republic of","Ukraine","Uganda","United States Minor Outlying Islands","United States","Uruguay","Uzbekistan","Holy See (Vatican City State)","Saint Vincent and the Grenadines",
"Venezuela","Virgin Islands, British","Virgin Islands, U.S.","Vietnam","Vanuatu","Wallis and Futuna","Samoa","Yemen","Mayotte","Serbia","South Africa","Zambia","Montenegro","Zimbabwe","Anonymous Proxy","Satellite Provider",
"Other","Aland Islands","Guernsey","Isle of Man","Jersey","Saint Barthelemy","Saint Martin"};


public CountryLookup(string fileName)
{
try
{
fileInput = new FileStream(fileName, FileMode.Open, FileAccess.Read);
}
catch (FileNotFoundException e)
{
throw new IOException("File " + fileName + " not found.");
}
}

public string lookupCountryCode(string str)
{
IPAddress addr;
try
{
addr = IPAddress.Parse(str);
}
catch (FormatException e)
{
return "-";
}
return lookupCountryCode(addr);
}

private long addrToNum(IPAddress addr)
{
long ipnum = 0;
byte[] b = addr.GetAddressBytes();
for (int i = 0; i < 4; ++i)
{
long y = b[i];
if (y < 0)
{
y += 256;
}
ipnum += y << ((3 - i) * 8);
}
//HttpContext.Current.Response.Write(ipnum);
return ipnum;
}

public string lookupCountryCode(IPAddress addr)
{
return (countryCode[(int)seekCountry(0, addrToNum(addr), 31)]);
}

public string lookupCountryName(string str)
{
IPAddress addr;
try
{
addr = IPAddress.Parse(str);
}
catch (FormatException e)
{
return "Unknown";
}
return lookupCountryName(addr);
}

public string lookupCountryName(IPAddress addr)
{
return (countryName[(int)seekCountry(0, addrToNum(addr), 31)]);
}

private long seekCountry(long offset, long ipnum, int depth)
{
byte[] buf = new byte[6];
long[] x = new long[2];
if (depth < 0)
{
//HttpContext.Current.Response.Write("Error seeking country.");
return 0; // N/A
}
try
{
fileInput.Seek(6 * offset, 0);
fileInput.Read(buf, 0, 6);
}
catch (IOException e)
{
throw new IOException("IO Exception");
}
for (int i = 0; i < 2; i++)
{
x[i] = 0;
for (int j = 0; j < 3; j++)
{
int y = buf[i * 3 + j];
if (y < 0)
{
y += 256;
}
x[i] += (y << (j * 8));
}
}

if ((ipnum & (1 << depth)) > 0)
{
if (x[1] >= COUNTRY_BEGIN)
{
return x[1] - COUNTRY_BEGIN;
}
return seekCountry(x[1], ipnum, depth - 1);
}
else
{
if (x[0] >= COUNTRY_BEGIN)
{
return x[0] - COUNTRY_BEGIN;
}
return seekCountry(x[0], ipnum, depth - 1);
}
}

public void Dispose()
{
if (_close && fileInput != null)
{
fileInput.Close();
fileInput = null;
}
}
}