To insert the contents of GeoLite2-City-Blocks-IPv4.csv into an array, we’ll use the built-in readarray command.Which Databases Do We Need?īefore proceeding further, let’s understand how we’ll code some nodes of the previous flowchart: This gives us approximately 4.3-0.6=3.7 billion IPv4 addresses, the same amount in GeoLite2. We must subtract 600 million reserved IPs that aren’t available for public routing from that theoretical number. In fact, since an IPv4 address is a 32-bit number, the total number of possible addresses is 2^32, which equals about 4.3 billion. However, our Bash code can be easily adapted to IPv6 addresses.Īs of January 2023, GeoLite2 contains 3,343,938 IPv4 CIDRs, corresponding to the worldwide coverage of 3,689,264,895 IPv4 addresses (not officially documented). We’ll focus on IPv4 only to avoid cumbersome scripting. In this tutorial, we’ll see how to look up the geolocation of an IP address in the Linux terminal using a local copy of MaxMind’s free GeoLite2 databases and a Bash script. However, we may prefer a locally hosted and manually inspectable database to avoid relying on external services. ![]() Our remote access service is powered by GeoSelect, so all of the geoselect tags including the control tags –, , and are all supported.įurther information on the supported tags is available here.Many web pages and RESTful services provide data about an IP address, including geolocation. We are also happy to update the template as frequently as you may require. ![]() We are happy to meet any special requirement that you may have regarding the format of the data. The template will be used to format the data that is returned by each request. If you elect not to supply a custom template then our default template will be used. Optionally, you may also like to provide us with a ‘template’ file which will be used by our server to format the response. You can nominate as many addresses as you require. We use the IP Address of the requesting host to identify authorized requests. All we need is the IP Address of the host(s) that will be sending the resolution request to our server. Here is what the results look like when using our default template. Note: The template need not be HTML, it can be plain text, or coma delimited text like "",etc In the above standard template they appear in meta tags so that they can easily be read by a perl script.Ĭlients are welcome to create their own template. Accordingly, the tags can appear anywhere in the page, and can appear more than once. The format of the response is totally user configurable – all it is, is a text file containing tags like where you would want the city name to appear. This request uses our default template, which is designed for parsing by a perl script. Once your access has been configured, you can access the service from within your cgi script with a HTTP request like – More information is provided on Templates below. Which returns a html page formatted according to your template. ![]() The service is accessed via http by sending a request like We have a standard template available, or alternatively you can create your own template. The information returned by a request is user configurable using a template file, so you can organize the data anyway that you like. We have chosen to use HTTP as the transport protocol as it passes easily through proxies and firewalls. Our remote access service accepts requests in the form of a URL.
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