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Back to the catalogueAdvertising semanticsCase 02 of 22
Carrier NAT / multi-family IP pooling
In high multi-family-unit markets and behind carrier-grade NAT, many households share one public IP or egress point, so one lookup result stands in for households spread across a wide area — and the shared point is often far from any of them. Fixed-wireless (5G) home internet adds drift: the household keeps its service while its IP-derived location moves between carrier egress points over time.
Class
Case to account for
Affects
1 conversion
01
Detection
Impression volume per IP far above single-household norms; households whose IP-derived cell moves across periods while the service address has not changed; high fixed-wireless or MDU share in the market.
02
Mitigation
01
Treat per-IP household multiplicity as a first-class field where the platform can estimate it
02
Resolve pooled IPs to an honest wide low-confidence footprint, never to a confident point
03
Stratify markets on MDU share and fixed-wireless penetration in any design that assigns geography from IP
03
Affected conversions
IP lookupH3 (probabilistic crosswalk)
OPENChapter
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