# Visitor beacon — detect reachability per ISP from real visitors The beacon reports, for each real visitor, whether a site was reachable — and maps their IP to their ISP. This is the only free way to cover **Celcom & Digi**, and it fills in every ISP your visitors actually use. Results merge into the dashboard Block chips and the bot's `/status` automatically. There are two snippets. Use the passive one everywhere; add the active one on one safe page if you want a direct "blocked" verdict (not just "reachable"). --- ## A) Passive beacon — put on EVERY monitored site (recommended) One line, in the `` or before `` of each site you monitor: ```html ``` - When the page loads, it reports **that site is reachable** for this visitor, tagged by their ISP. So you get live per-ISP reachability (Unifi, Maxis, Celcom, Digi, …). - A blocked ISP shows up as its visitors **disappearing** (reachable hits stop coming). - Zero config, no data read from the visitor — it only sends the hostname. - Easy bulk install: add it once to a shared header/footer template, or via Google Tag Manager across all sites. ## B) Active "hub" beacon — optional, for a direct 🚫 blocked verdict Put this on **one page that's always reachable** (e.g. a clean domain, or your main site that's never blocked). It test-loads every monitored domain from the visitor's browser and reports reachable/blocked — so a Celcom user who's blocked produces a direct **Celcom: blocked** result. ```html ``` > The active test loads each site's `/favicon.ico`. Make sure your sites serve a > favicon (most do) — a reachable site with no favicon would look "blocked". If a > site lacks one, add any small favicon, or skip the active beacon for it. --- ## How results appear - **Dashboard → Block column:** a per-ISP chip (🚫 / ✓) sourced from real visitors, merged with Globalping. Real-visitor data and agents take priority over remote probes. - **Telegram bot → `/status `:** a "Block by ISP" line including beacon ISPs. - Verdicts use the **last 48 h** of hits, so they reflect current reality. ## Privacy / cost - The beacon sends only the hostname + reachable flag. IP→ISP is looked up server-side via the free ip-api.com and **cached**, so repeat visitors cost nothing. - No paid services, no API keys.