Internet status in São Tomé & Príncipe Operational
Address blocks silent right now: 0% · 2026-10-21 03:09:25 UTC
The disruption in São Tomé & Príncipe affected CST: signal down 41%, serves 81.3% of the country's users. Unitel STP showed no change. Across the country, 33% of address blocks stopped answering our checks.
Latest recorded event: 6 Oct 2026 18:50 UTC · Degraded · Address blocks silent 33% · 30 min. Recorded outages in São Tomé & Príncipe ↓
Leading providers
| Provider | ASN | Share of users | Status | Signal dip |
|---|---|---|---|---|
| CST | AS328191 | 81.3% | Operational | 0% |
| Unitel STP | AS327725 | 13.5% | Operational | 0% |
| Starlink · global network, measured worldwide | AS14593 | 5.2% | Operational | 0% |
ℹ️ How to read this page
Degraded - signal dip ≥20% below its 24h baseline - partial outage or major disturbance
Major outage - dip ≥50% - large-scale loss of connectivity
“Signal dip” compares the current BGP-visibility and active-probing levels against the median of the previous 24 hours, corrected for global measurement artifacts (a worldwide simultaneous drop is ignored).
Data refreshes hourly. Per-ISP rows are measured in depth when the country shows an anomaly (pilot countries - continuously). The probable cause is a heuristic: an active fault on a submarine cable feeding the country ranks first, then routing signals, then power/access patterns.
Recorded outages in São Tomé & Príncipe
| When (UTC) | Duration | Severity | Address blocks silent | Context |
|---|---|---|---|---|
| 6 Oct 2026 18:50 | 30 min | Degraded | 33% | technical, no conflict or censorship signal |
| 5 Sep 2026 23:50 | 20 min | Degraded | 25% | technical, no conflict or censorship signal |
| 30 Jun 2026 21:50 | 60 min | Degraded | 25% | technical, no conflict or censorship signal |
| 27 Jun 2026 02:50 | 20 min | Degraded | 27% | technical, no conflict or censorship signal |
| 22 Jun 2026 13:10 | 80 min | Degraded | 22% | technical, no conflict or censorship signal |
| 22 Jun 2026 11:00 | 70 min | Degraded | 25% | technical, no conflict or censorship signal |
Submarine cables feeding São Tomé & Príncipe
If a national outage coincides with a fault on one of these systems, the cable is a likely cause - check its live page:
Internet in São Tomé & Príncipe: questions and answers
Is the internet down in São Tomé & Príncipe right now?
No. At the last check (21 Oct 2026 03:09 UTC) the internet in São Tomé & Príncipe was working normally: the signal was at its usual level.
When was the last internet outage in São Tomé & Príncipe?
The latest recorded event in São Tomé & Príncipe started on 6 Oct 2026 18:50 UTC and lasted 30 min. The signal dropped by 33% at its lowest point.
Which internet providers are watched in São Tomé & Príncipe?
GeoCables watches the leading providers of São Tomé & Príncipe: CST (81.3%), Unitel STP (13.5%), Starlink (5.2%). The share is the part of the country's internet users served by the provider.
Which submarine cables connect São Tomé & Príncipe?
São Tomé & Príncipe is connected by 2 submarine cables in the GeoCables database, among them Africa Coast to Europe (ACE), Ultramar GE. A break on one of them can slow down or cut international traffic.
How does GeoCables detect an internet outage?
The status comes from two independent signals: routing announcements (BGP) and active probing of networks inside the country. A drop of 20% or more below the usual level of the last 24 hours is shown as degraded, a drop of 50% or more as an outage. See internet outages in all countries.