authentication-login-page[.]duckdns[.]org

Authentication-login-page.duckdns.org is an active credential‑phishing domain observed on 26 July 2026. Technical inspection shows the hostname resolves to the public IPv4 address 13.50.248.23. The domain is hosted under the dynamic DNS service DuckDNS, as indicated by the registration record. Google Safe Browsing classifies the site as a social‑engineering threat, and the domain appears on two independent security blocklists.

Both PhishDestroy and OpenPhish have listed the domain as malicious, confirming its use in phishing campaigns. VirusTotal analysis reports that 15 of 91 scanned security vendors flag the host as malicious, providing additional corroboration of its hostile nature. No authoritative nameserver information is available; the NS lookup returned NS_NOT_FOUND, which is consistent with the use of a dynamic DNS provider that often omits traditional NS records. The available intelligence does not include SSL/TLS details, HTTP response codes, or page‑title metadata, so the exact content served by the site remains undocumented.

Given the combination of dynamic‑DNS registration, IP resolution, multiple blocklist listings, and the Safe Browsing social‑engineering label, the domain should be treated as high‑risk. Defensive actions include adding the domain and its resolving IP to network‑level deny lists, configuring web‑proxy filters to block HTTP(S) requests to the host, and ensuring endpoint protection solutions receive the latest indicator updates from the blocklist providers. Continuous monitoring of the IP address and any future DNS changes is advised, as dynamic DNS services can rapidly reassign hosts. Organizations should educate users about unsolicited login prompts and enforce multi‑factor authentication to mitigate credential compromise should a user encounter the site.