Go Azure IP Ranges

Fetch Azure IP Ranges for the current week and write them to a file

Getting started

Download one of the newest releases

az-ip-ranges.exe 

This will output the IPv4 addresses to a file named like ip-ranges-weekNr-Year-region.txt

for example ip-ranges-w38-2022-westeurope.txt

Or

Fetching all IPv4 addresses for a specific region

az-ip-ranges.exe --region=westeurope

If you don't specify a region it will only add the IPv4 addresses of Azure services that are not bound to a specifc region.

The filename will contain no-region to mark that file as not having specified a region parameter

How does it work?

• The application makes an HTTP request to the download page of the weekly .json file Microsoft publishes
• in the HTML body it looks for a href attribute with the value of ServiceTags_Public. This is part of the name of the .json file
• It gets the link from the <a> tag and makes a new HTTP request to that url, It now retrieves the weekly uploaded .json
• It outputs the HTTP response to a new .json file
• Then it parses the .json to a struct we created named AzureIpRange
• Next it makes some checks based on the filter you have specified to add or skip a certain entry for the new file
• It creates a new .txt file with the IPv4 addresses based on your filters

⚠️ By default it will also add addresses of services that are not bound to a region or have RegionId 0 which also means the service does not belong to a specific Azure region.

Todo

• Add filter for Region and Azure Platform
• Make CLI tool from application
• Read from HTTP response instead of local file
• Add filter for specific Azure Service systemService
• Add option to query all regions
• Add check for giving valid region and service
• Sign .exe build in CI process