coin-base-ext-us[.]pages[.]dev

Analysis of coin-base-ext-us.pages.dev, registered on February 21 2026 through Cloudflare, Inc., indicates a high‑risk brand‑impersonation campaign targeting Coinbase users. The domain resolves to Cloudflare’s edge address 104.21.96.1 (AS13335, United States) and is served by Cloudflare’s DNS infrastructure (gigi.ns.cloudflare.com, margo.ns.cloudflare.com). The site presents a page title of “Suspected phishing site | Cloudflare,” suggesting that the content has been flagged by Cloudflare’s own detection mechanisms. An SSL certificate issued by Google Trust Services (WE1) is present, confirming that the site was using a valid HTTPS connection despite its malicious intent.

HTTP responses return a 403 status code, and the service employs HSTS and HTTP/3, consistent with modern hosting configurations. Reputation metrics are poor: Scamadviser scores the domain 10/100, Gridinsoft rates it 0/100, and the domain appears on at least one security blocklist (PhishDestroy). Google Safe Browsing classifies the site as social engineering, and VirusTotal reports that 11 of 95 scanned security vendors flag the domain as malicious.

The page is currently taken offline, but historical evidence confirms the use of a crypto‑scam template that impersonates Coinbase. Defenders should continue to block the domain at perimeter filters, monitor for similarly structured subdomains under the “pages.dev” namespace, and enforce strict outbound filtering for Cloudflare edge IP ranges associated with this ASN. Ongoing surveillance of newly registered domains that combine brand keywords with Cloudflare‑hosted services is recommended to pre‑empt further impersonation attempts.