Ad-tech
Blocklist (blacklist)
A list of publisher placements excluded from bidding.
A blocklist is the inverse of a safelist — placements where the campaign is forbidden to bid. Used for publishers with high IVT, brand-safety conflicts, or chronic non-conversion. Native networks support fairly large blocklists (2,000–10,000 sites). Programmatic DSPs (DV360, TheTradeDesk) use category-level blocklists in addition to URL-level.
Example
Health-supplement campaign blocks 340 site IDs that drove only IVT-flagged clicks per the tracker's bot-detection over 30 days.