Leveraging Censys Data: From the Classroom to Improving an Internet Monitoring Public Service

### Executive summary: This Georgia Tech study evaluates whether supplementing IODA's ICMP-based active probing with Censys TCP/UDP scans can improve Internet outage detection. The analysis across multiple snapshots demonstrates that combining probe protocols reduces the number of /24 blocks with low availability (improving coverage by roughly 800k /24s, ~5% of IPv4), reveals 328.5k blocks seen only by Censys (about 106k of which are likely reliably monitorable), and exposes ~1.8k ASes not visible via ICMP; the authors recommend incorporating Censys scanning techniques into IODA's Active Probing signal.