← Measured in the wild

*-netseer-ipaddr-assoc.xy.fbcdn.net

A hostname family · classified as cdn

The * stands for a machine-generated segment — this service mints a fresh hostname per device or install (a UUID or random blob), so the individual hostnames carry no information the family doesn't. We group them into one claim per app: corroboration is counted across all member hostnames, and every claim below cleared the same two gates as everything else on this site — separate accepted donations and human review.

What our research panel found AI-drafted · human-reviewed

We ask several independent AI models the same question and publish their answers separately — cross-vendor agreement is evidence against fabrication, and disagreement is worth seeing. 3 of 3 models answered, overall confidence medium — classification split: anthropic=cdn, openai=unknown, gemini=cdn. A human reviewed this domain's claims before anything here published.

Anthropic Claude — cdn

fbcdn.net is Meta's content delivery network domain, so for a Meta-owned app like Instagram this is first-party CDN infrastructure rather than a third-party tracker; the 'netseer-ipaddr-assoc' subdomain pattern appears to relate to IP/network association for CDN edge selection, though I cannot verify its exact purpose. The declared label already covers extensive collection including device IDs and app interactions, so nothing here implies an undeclared flow.

OpenAI — unknown

The fbcdn.net hostname suggests Meta infrastructure, but the specific netseer-ipaddr-assoc subdomain's function and data flow are not established by the provided evidence. Instagram's label already declares extensive collection including device IDs and diagnostics, so undisclosed collection cannot be determined.

Google Gemini — cdn

The domain fbcdn.net is Meta's official content delivery network used to host media and assets for Meta properties, including Instagram. As a first-party CDN, this contact is expected operational infrastructure and is not undisclosed.

Apps measured contacting this family

AppHostnamesDonationsContactsSeen
Instagram4631382026-07-30
Facebook93272026-07-30

Member hostnames observed

55 distinct hostnames in the published evidence — showing 40:

Think something here is wrong?

Evidence and research improve when people push back. Tell us what to re-check — a misattributed domain, an outdated classification, a claim about your own app — and a human will review it. Responses can take up to 30 days.

If you leave an email it is encrypted at rest and opened only to answer you — never shared, never used for anything else. It is erased 30 days after we resolve this (or 180 days if it is still open) without you asking, and you can erase it sooner at any time; either way your correction stays, anonymously. Leave it blank and your request is fully anonymous from the start (we store no IP address either way).