This period saw a net swell of blocklist activity, with 6,040 new domains added and 2,227 removed. Most of the action came from Steven Black Unified Hosts (+2,765/-1,980), with EasyList and AdGuard lists also busy. Peter Lowe’s Ad and Tracking Server List did something rare: a bulk removal of domains only just added. Let’s dig in.

Peter Lowe’s Housecleaning: 8 Domains In, 8 Domains Out

Peter Lowe’s Ad and Tracking Server List is usually conservative about removals. This period, it axed eight domains, all of which had only just been listed. For example, ads.fortunecity.com and oascentral.fortunecity.com were both added and removed on October 31. Same story for bannertrack.net, magicadz.co, and clickedyclick.com.

So what? If you rely on Peter Lowe’s for your allow/block logic, be careful with automation: domains can disappear as quickly as they’re listed, especially if a false positive slips in. If your analytics were suddenly blocked and then unblocked, this is why.

mpuls.ru: The 24-Hour Block

mpuls.ru was added to AdGuard DNS Filter on October 30 and removed the very next day. Short-lived entries like this often point to either: (1) a mistaken inclusion, or (2) someone successfully arguing for removal. If your service runs on mpuls.ru, you may have seen DNS-level blocks for one day only.

So what? If you get customer complaints about sudden reachability issues, always check recent blocklist flips. Fast reversals are more common than you think, especially on high-churn lists like AdGuard DNS.

adfox.cam: Double Trouble

adfox.cam popped up on both EasyList and Peter Lowe’s this period. Double-listing is a sign that a domain’s ad-serving activity is drawing broad attention. If you’re running any legit business on adfox.cam (unlikely, but you never know), expect users across multiple blocking stacks to miss your scripts.

So what? Marketers, take note: once a domain lands on two or more curated lists, your campaigns won’t reach anyone with even basic blocking enabled. Move fast, or move to a new domain.

The "Maxcluster" False Alarm

users.maxcluster.net was briefly blocked by Peter Lowe’s before being removed in the same period. Maxcluster is a German hosting provider, not an ad or tracking vendor. This was likely a false positive.

So what? SaaS and hosting providers: even if you’re not in ad tech, you can get caught in the crossfire. Monitor list changes if you run customer-facing infrastructure.

Numbers This Period

Next digest drops November 3, 2026. For real-time lookups, hit isblocked.fyi.