en-extension-coinbase[.]pages[.]dev

The domain en-extension-coinbase.pages.dev was registered on February 21, 2026 via Cloudflare, Inc. and is currently taken offline. DNS resolution points to the Cloudflare edge address 172.66.44.73, which belongs to AS13335 (Cloudflare, Inc.) and is geolocated in the United States. The domain uses Cloudflare nameservers tiffany.ns.cloudflare.com and milan.ns.cloudflare.com, and the TLS certificate is issued by Google Trust Services under the WE1 profile, indicating a valid HTTPS endpoint at the time of observation. HTTP requests return a 403 status code and the page title reported by the server is "Suspected phishing site | Cloudflare", confirming that the site is being flagged by Cloudflare's own protection mechanisms. Automated analysis identifies HSTS, Cloudflare CDN, and HTTP/3 as active technologies.

Threat intelligence classifies the site as a crypto‑related scam that impersonates the Coinbase brand. Google Safe Browsing has flagged the URL for social engineering, and VirusTotal records show that 13 of 95 scanners flagged the domain as malicious. The domain appears on a single external blocklist and has been blocked by the PhishDestroy service. Reputation services assign very low trust scores—Scamadviser rates the site 10/100 and Gridinsoft 0/100—consistent with its malicious intent.

While the site is offline, the combination of a recent registration date, Cloudflare‑hosted infrastructure, a valid Google‑issued certificate, and multiple vendor detections strongly suggests a purposeful brand‑impersonation campaign targeting Coinbase users. Defenders should continue to monitor the domain for any re‑appearance, enforce blocklist rules that include en-extension-coinbase.pages.dev, and ensure that endpoint protection solutions reference the observed indicators (IP 172.66.44.73, the certificate fingerprint, and the 403 response pattern).