An intermediate page between the ad and the offer that pre-qualifies the visitor and runs the antifraud checks before a lead is created.
A prelander (pre-landing page) sits between the ad click and the offer form. Editorially it warms and qualifies the visitor — a review, quiz or advertorial — lifting the conversion rate of the offer that follows. Technically it is where the device fingerprint is collected and the cloak logic runs.
Prelanders are served from domains the affiliate controls; rotating across a pool of them limits the damage when any single domain is blocked by a network or filter.
In d0pe prelanders are served from a health-checked domain pool, and the domain's TLS mode determines whether the JA4 device signal can be captured.