CloudTrace Project Overview

The CloudTrace project investigates how cloud networks interconnect and interact with the public Internet. We do this using by probing every routed /24 IPv4 subnet. This probing uses a mix of ICMP Echo Requests, UDP and TCP Syn probes to gather the data necessary to interpret the Internet topology. UDP and TCP probes used destination port 30000.

Opt Out

We probe every /24 once every 11 hours, but a target might receive up to 32 probe packets in a short period of time. To opt out, send an email to specifying the address space we should avoid.

Acknowledgment of awarding agency’s support

The CloudTrace project is sponsored by the U.S. Department of Defense (DoD) Defense Advanced Research Projects Agency under Performance Evaluation Network Measurements and Analytics (PENMAN), Cooperative Agreement HR00112020014. It does not necessarily reflect the position or the policy of the Government, and no official endorsement should be inferred.

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