Location detecting techniques for IP addresses

What are the location detecting techniques for IP addresses?
I know to look at the
$_SERVER['HTTP_ACCEPT_LANGUAGE'] (not accurate but mostly useful to detect location, for example if an IP range's users set French to their browser then it means that this range) belongs to France
and
gethostbyaddr($_SERVER['REMOTE_ADDR']) (to look country code top-level domain)
then may be to whois gethostbyaddr($_SERVER['REMOTE_ADDR'])
sometimes:
$HTTP_USER_AGENT (Firefox's user agent string has language code, not accurate but mostly can be used to detect the location)

Also I know how to get the time zone but it does not work in the new browsers. Moreover there is css issue that detects visitor's history, it can be used to see what google and wikipedia pages he/she has visited (google.co.uk, google.com.tr)

But what about cities?

Tim Jansen

You can't do this without a database that maps IP addresses to cities/countries/providers. There are commercial offerings such as ip2location that you could use. ~~AFAIK there is no free alternative though, as maintaining such a IP database is quite a lot of work.~~ Free alternative: GeoIP2

Update: There are several things that allow you to create such a db, if you invest enough time:

Use the databases provided by regional and local registries to find an IP's owner.
Many ISPs use a naming schema that allows you to locate the user. Sometimes you can even read the city name in plain text if you do a reverse-DNS lookup. Sometimes it is more cryptic. For example I currently have p5dcf6c4a.dip.t-dialin.net , and I have no idea that the naming scheme is..
Use a traceroute. If you can't identify the location of a user, you can still find out the location of its uplink

If you looking for some copy - paste solution, i foudn this code :

    function countryCityFromIP($ipAddr)
{
//function to find country and city from IP address
//Developed by Roshan Bhattarai http://roshanbh.com.np

//verify the IP address for the
ip2long($ipAddr)== -1 || ip2long($ipAddr) === false ? trigger_error("Invalid IP", E_USER_ERROR) : "";
$ipDetail=array(); //initialize a blank array

//get the XML result from hostip.info
$xml = file_get_contents("http://api.hostip.info/?ip=".$ipAddr);

//get the city name inside the node <gml:name> and </gml:name>
preg_match("@<Hostip>(\s)*<gml:name>(.*?)</gml:name>@si",$xml,$match);

//assing the city name to the array
$ipDetail['city']=$match[2]; 

//get the country name inside the node <countryName> and </countryName>
preg_match("@<countryName>(.*?)</countryName>@si",$xml,$matches);

//assign the country name to the $ipDetail array
$ipDetail['country']=$matches[1];

//get the country name inside the node <countryName> and </countryName>
preg_match("@<countryAbbrev>(.*?)</countryAbbrev>@si",$xml,$cc_match);
$ipDetail['country_code']=$cc_match[1]; //assing the country code to array

//return the array containing city, country and country code
return $ipDetail;

}

Hope this helps somebody.

There are databases (some of them are free of charge) which can be used to convert IP's into Cities:

eg: http://www.maxmind.com/app/geolitecity

You can map an IP address to its location (city, country, postal code), timezone etc. with either a database or an API (hosted database).

Here's an example of using an API

curl https://ipapi.co/city/ 
> Mountain View

curl https://ipapi.co/country/
> US

curl https://ipapi.co/timezone/
> America/Los_Angeles

more here : Location from IP address

Instead of using third party API I would suggest you to use self hosted IP record. This post explain you more

http://www.techsirius.com/2014/05/simple-geo-tracking-system.html

Basically they are using maxmind's country city IP database record [http://dev.maxmind.com/geoip/geoip2/geolite2/] with few modifications. After that a sample query

$ip =  $_SERVER['REMOTE_ADDR'];
$long = sprintf('%u', ip2long($ip));
$sql = "SELECT * FROM `geo_ips` WHERE '$long' BETWEEN `ip_start` AND `ip_end`";

U can use this function

 function ip_info(){
            return $data = json_decode(file_get_contents('http://ip-api.com/json/'),true);
        }

Call the function

$info = ip_info();
var_dump($info);

One way in which these databases are compiled is from whois information. For example, to determine the location of 69.59.196.211:

fmark@home:~$ host 69.59.196.211 211.196.59.69.in-addr.arpa domain name pointer stackoverflow.com. fmark@home:~$ whois stackoverflow.com

Whois Server Version 2.0

Domain names in the .com and .net domains can now be registered with many different competing registrars.
 <SNIP>
> Registrant: stackoverflow.com llc
410 Clayton Ave El Cerrito, California 94530 United States
 <SNIP>

Obviously this isn't hugely accurate, so more sophisticated techniques are allegedly used.

If the geolocation functionality is not a big requirement for your project, you can use something as simple as this:

$geotxt='';
$dt=json_decode(@file_get_contents('https://freegeoip.net/json/'.$_SERVER['REMOTE_ADDR']));
if ($dt!=null) $geotxt=$dt->country_name.', '.$dt->region_name.', '.$dt->city;
echo $geotxt;

You have to take into account that freegeoip has a limit of 10k request/hour.

Jonathan

Most of the existing databases use an aggregation of data from the international registries ARIN, AFRINIC, ANIC etc as well as user submitted locations. More sophisticated techniques include Topology and Constraints Geolocation.

I run my own API ipdata.co that provides several data points including, the country, city, region, lat/long and others.

This answer uses a 'test' API Key that is very limited and only meant for testing a few calls. Signup for your own Free API Key and get up to 1500 requests daily for development.

php > $data = json_decode(file_get_contents('https://api.ipdata.co/69.59.196.211?api-key=test'),true);
php > echo $data['country_name'];
//United States
php > echo $data['city'];
//Albany

来源：https://stackoverflow.com/questions/2574542/location-detecting-techniques-for-ip-addresses

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