Pixalate has introduced a new internet protocol version 6 (IPv6) Data Centre Blocklist and expanded its IPv4 Data Centre Blocklist, aiming to enhance pre-bid defences against invalid traffic (IVT) that originates from data centre infrastructure.
These updates provide advertisers, demand-side platforms (DSPs), supply-side platforms (SSPs), and other firms with tools to filter server-originated impressions before any bidding occurs.
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The debut IPv6 list contains 16,292 classless inter-domain routing (CIDR) ranges from 66 providers, with updates published weekly.
The expanded IPv4 blocklist covers 111,879 CIDR ranges from over 3,000 providers, including an additional 15,241 ranges from 13 operators, among them are several Asia-based organisations.
Both blocklists are supplied in comma-separated values (CSV) format and are designed to facilitate the pre-bid exclusion of data centre IP addresses, which the Media Rating Council (MRC) defines as General Invalid Traffic (GIVT).
According to MRC standards, filtering data centre traffic that originates from major hosting services such as Amazon AWS, Google, and Microsoft is required.
Pixalate reports that the blocklists include providers based in North America, Europe, and Asia. Among those listed are Amazon Web Services, Google Cloud, Microsoft Azure, Meta, Oracle Cloud, Alibaba Cloud, Tencent Cloud, and OVHcloud.
The company notes that IPv6 adoption is increasing, with Google reporting that nearly half of internet traffic now using this protocol.
In parallel, the quantity of IPv6 CIDR ranges from major providers has grown significantly, according to Pixalate’s analysis of data between August 2025 and August 2026.
The firm highlights that blocking at the address level is no longer practical for IPv6, due to its vast address space, and recommends range-based filtering.
Pixalate’s data science team compiles the blocklists using provider-published information, open-source IP lists, and its own analyses, with efforts made to avoid including IP address ranges associated with legitimate consumer traffic.
The lists are continuously reviewed to reflect ongoing changes in cloud infrastructure and IP allocation.
