Domain & Stack Inspector is a Chrome side-panel extension that shows two things about the website currently open in your active tab: its domain expiry date, and which common frontend technologies it appears to be built with.
React, __NEXT_DATA__), <meta> tag values, and DOM selectors — used only to identify frontend frameworks, CMS, or analytics tools. This scan runs locally in your browser.The domain name of the current tab is sent to rdap.org, a public RDAP lookup service, to retrieve that domain's registrar, registration date, expiry date, and nameservers — the same category of data available via WHOIS.
The domain name is also sent to ipwho.is, a public IP/geo lookup service, to identify the hosting provider (ISP/ASN) and approximate server location of the site you're viewing.
No other page content, browsing history, or personal data is transmitted to either service, and no data is sent to any server operated by the developer.
RDAP and hosting lookups are each cached locally in your browser's chrome.storage.local for 24 hours to avoid repeat lookups. This cache stays on your device and is never accessible to the developer.
This extension is a general-purpose inspector — by design it needs to work on whatever website you're currently viewing, not a fixed list of sites. Host permission is used only to read the technology signals described above, and is never used to modify pages, collect data, or communicate with any server other than rdap.org.
Faiz Azizan — drfaizazizan.com