This is free and unencumbered software released into the public domain.

Demo, enjoy!

<script src="geoLite.js" defer></script>
<script src="geoLite.datav5-20251025.js" defer></script>

As always, data file is loaded after geoLite.js along with attribute defer to allow page to render.
Alternatively see geoLite.html.

Due geoLite needing to "decompress" data it can take half a second upto a second of delay before user can interact with the page.

• Fast lookup (~900k op/sec)
• Country code and name (even emoji)
• Continent code and name
• ASO ("ISP" related)

Internet connection is not required after database is loaded - it works locally.

var info = geoLite.lookup(ipAddr.value);
ipaResult.innerHTML = (
	"Country: " + info.CN + " " + info.emoji + " " + info.CC + "\r\n" +
	"Continent: " + info.contName + " (" + info.contCode + ")\r\n" +
	"ASO: " + info.ASO
);

Please avoid using this feature even though it works.
Can fail if using ipv6 (VPN/Tor or similar).

// it will attempt to fetch ip from multiple sources until one is retrieved
geoLite.fetchPubIPv4(function(arr, xhr, url, elapsed) {
  console.log("Result", arr, "from", u, "; elapsed:", elapsed, "[ms]");
});

Note: geoLite already has these as default.

// code should be executed before fetchPubIPv4 is called.
// if using IPv6 then fetch will FAIL to parse
geoLite.ipFetchTimeout = 7000; // 7000 is default
geoLite.ipFetchMaxTimeout = 12000; // 12000 is default
geoLite.ipFetchURLs = ["https://icanhazip.com", "https://httpbin.org/ip"];

(fyi: MiB = 1024 * 1024)
Database 20251025 is 3.31MiB (3481164 bytes; CSV size: 20.32750MiB)
Database 20241017 is 3.06MiB (3204748 bytes; CSV size: 18.45380MiB)
JS Databases: Link

Requirements:

1. NodeJS or BunJS or anything that runs nodejs code.
2. Install dependency: mmdb-reader (BunJS auto installs it?)
3. Downloaded file devtools/geoLite-dev.js

Steps:

1. Download both ASN and City mmdb from anywhere.
   • Example: P3TERX/GeoLite.mmdb
2. Ensure to rename it in this format: GeoLite2-City-{YYYYMMDD}.mmdb
   • Example: GeoLite2-ASN-20230107.mmdb
3. Create folders mmdb and csv in the same folder of the file devtools/geoLite-dev.js
4. Put .mmdb files in folder mmdb
   • Example 1: mmdb/GeoLite2-ASN-20230107.mmdb (for ASN)
   • Example 2: mmdb/GeoLite2-City-20230107.mmdb (for City)
5. Edit file devtools/geoLite-dev.js
   1. (All below is about variable geoLiteConfig)
   2. Set defaultDbDate use this format YYYYMMDD (example: 20250930)
   3. Set scriptAct to 2 to build csv and data file.
6. Save and Run the script

   node geoLite-dev
   

7. Wait, usually can take upto an hour or more.
8. Make sure to reset scriptAct to 0 once done.
9. Enjoy (data is built in same dir as geoLite-dev.js)

Set geoLiteConfig.scriptAct=4 in devtools/geoLite-dev.js

Example output:

IPStart,IPCount,CountryCode,CountryName,ContinentCode,ContinentName,ASO
16777216,256,AU,Australia,OC,Oceania,CLOUDFLARENET
16777472,768,CN,China,AS,Asia,
...

None at all, unless someone suggests public domain licensed library that can be used to further compress data file.