If you prefer to allow only strictly necessary AdGuard services, you can block tb-rg.adguard.net in your DNS filter (e.g., Pi-hole, AdGuard Home). However, be aware:
is the primary domain for a well-known third-party web service that provides direct download links for official Microsoft software. Often referred to as "TechBench by WZT," this site acts as an interface for Microsoft’s own servers, allowing users to easily access genuine Windows and Office ISO files that are otherwise difficult to find on the official Microsoft website . Key Features of tb.rg-adguard.net
If you want absolute peace of mind when using third-party links, you can verify the file’s integrity using its cryptographic hash (SHA-256 or SHA-1). Download the ISO from the site.
Select the edition (e.g., Windows 10/11 Multi-edition which includes Home/Pro). Select Language: Choose your desired language. Select Architecture: Choose x64 (64-bit) or x86 (32-bit). tb-rg adguard.net
The subdomain tb-rg isn't random. In internal AdGuard architecture, it stands for It’s the first line of defense that doesn’t need to trust any external source—it verifies every request against a local zero-knowledge proof.
Your router or a device on your network is using AdGuard DNS services. The query is likely for telemetry, filter updates, or safe browsing lookups.
: It is useful for creating installation media for computers that do not have active internet access or cannot run the Media Creation Tool. If you prefer to allow only strictly necessary
At first glance, it looks like a fragmented domain – a hybrid of an unknown prefix ( tb-rg ) and a well-known DNS filtering service ( adguard.net ). Is it a threat? A tracking domain? A misconfigured service? Or simply a benign part of AdGuard’s infrastructure?
: Pick your exact release (e.g., Windows 11, Version 23H2 ).
The platform functions as a static HTML page that mimics the older, mobile version of Microsoft's TechBench interface. By emulating this legacy interface, tb.rg-adguard.net can query Microsoft's internal download infrastructure and return a direct link to the requested file, which is then hosted on Microsoft's own servers ( *.microsoft.com ). The website is not directly affiliated with Microsoft; it is a project built and maintained by a community of developers. Key Features of tb
It is a subdomain of AdGuard, a legitimate privacy company.
So when you see tb-rg adguard.net in your logs, you are witnessing a connectivity probe .