← Measured in the wild

*-netseer-ipaddr-assoc.xz.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/infrastructure domain, and Instagram (com.burbn.instagram) is a Meta property, so this is effectively a first-party CDN endpoint; the unusual 'netseer-ipaddr-assoc' subdomain label suggests some IP-address association routine but I do not know its exact function. Any resulting data flow (device/network identifiers, app performance) falls within the app's already very broad declared collection, so nothing here appears outside the label.

OpenAI — unknown

The fbcdn.net hostname suggests Meta infrastructure, but the specific netseer-ipaddr-assoc subdomain does not establish a clear tracker, analytics, advertising, CDN, or first-party function from the provided data. Instagram's label already declares broad collection and sharing categories, so an undisclosed flow cannot be determined.

Google Gemini — cdn

The domain fbcdn.net belongs to Meta's content delivery network used to serve Instagram content and infrastructure. As first-party CDN traffic for Meta's own app, this network contact does not indicate an undisclosed third-party data flow.

Apps measured contacting this family

AppHostnamesDonationsContactsSeen
Instagram10473112026-07-28 → 2026-07-30
Facebook227632026-07-28 → 2026-07-30

Member hostnames observed

126 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 Tell us what to re-check — a misattributed domain, an outdated classification, a claim about your own app — and a human will review it.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).