16,855 domains were added to block lists this period. 10,683 were removed. The busiest lists: AdGuard DNS Filter (+5,548 adds), AdGuard Tracking Protection (+4,342), and Steven Black Unified Hosts (+4,713). But the real story is in what got taken off, and which domains drew cross-list fire.
Equifax’s 1stparty.equifax.co.uk: In, Out, Gone
1stparty.equifax.co.uk was removed from both AdGuard DNS Filter and AdGuard Tracking Protection just one day after it appeared. A false positive, or a lobby call from Equifax? Either way, if you saw Equifax pixels breaking in the last 48 hours, that's why. For MarTech teams, this is a reminder that even big-name first-party domains can get caught up in the blocklist crossfire—sometimes only for a few hours.
News Flash: digi.no Subdomain Delisted
1j2n061x3td.www.digi.no, a subdomain of Norwegian news site digi.no, was also quickly removed from AdGuard DNS Filter and Tracking Protection. If you run analytics or ad tech for media sites, this kind of subdomain collateral damage can mean a sudden loss of tracking or ad impressions. Always monitor for blocklist-induced dips in your dashboards—sometimes it’s not you, it’s the lists.
Generated Domains: Bulk Adds, Bulk Removes
Hundreds of randomly generated .cfd domains came and went. For example, 11ux.95ziegv587wohx9rzj.cfd was both added and removed from AdGuard Base and DNS filters within 24 hours. Same story for 1hl.hxjwiwl6j6hc8yb.cfd. If you’re seeing fluctuating block events on fresh domains, it’s probably this block-and-purge churn. For fraud detection: yes, the arms race is still on.
High-Consensus Blocks: If It Looks Like a Duck
Eight new domains showed up on EasyList, AdGuard Base, and AdGuard DNS Filter at the same time. Examples: affablebills.com, acorntar.com, aaixcromuxjly.online. When three or more lists agree that fast, you can be sure these are either ad/tracker networks or malvertising ops. For privacy engineers: treat anything in this bucket as radioactive until proven otherwise.
Numbers this period
| List Name | Added | Removed |
|---|---|---|
| Steven Black Unified Hosts (ads + malware) | 4,713 | 4,438 |
| AdGuard DNS Filter (ads) | 5,548 | 2,973 |
| AdGuard Tracking Protection Filter | 4,342 | 2,517 |
| AdGuard Base Filter (ads) | 1,374 | 679 |
| EasyList (ads) | 826 | 0 |
| Online Malicious URL Blocklist (malware) | 27 | 65 |
| EasyPrivacy (tracking) | 19 | 1 |
| Peter Lowe's Ad and Tracking Server List | 0 | 9 |
| uBlock Filters – Privacy | 1 | 1 |
| uBlock Filters – Badware Risks | 2 | 0 |
| AdGuard Annoyances Filter | 1 | 0 |
| uBlock Filters – General | 1 | 0 |
Next digest drops October 13. For domain checks anytime, hit isblocked.fyi.