Grace Hopper
MEDIUMGrace Hopper is a 6,000km private subsea cable owned by Google (AS15169), connecting Bude in the UK, Bilbao in Spain, and New York. Colt Technology (AS8220) holds a leased fibre pair on Grace Hopper as part of their acquisition of Lumen's subsea cable portfolio, which included Dunant capacity and the AC-1/AC-2/Yellow cable systems. This creates a unique dual-ASN monitoring signal: simultaneous BGP prefix anomalies on both AS15169 and AS8220 on the London-New York corridor provide materially stronger confirmation of a cable fault than either ASN alone. CableAlert applies a score bonus when this pattern is detected.
Consortium Members & Monitored ASNs
Landing Stations
Monitoring Notes
Dual-ASN signal: AS15169 (Google, cable owner) and AS8220 (Colt, leased pair from Lumen portfolio acquisition) both signal on Grace Hopper faults. Simultaneous BGP anomalies on both ASNs = high-confidence confirmation.
Other Cables on London ↔ New York
Telegram push alerts when Grace Hopper shows BGP anomalies or latency spikes on the London ↔ New York corridor.