As part of ongoing research we may conduct scans of Internet hosts. While we always aim to do so without causing any disruption to the scanned parties and intermediate entities, we understand that this may not always be the result. This page provides an overview of current and past scans, as well as the responsible party. Please contact them in the event of any issues.

Alexa 1m DNS Resolution (April 1-3, 2019; May 14-17, 2019). Resolving the alexa top 1m website domains. The traffic load is split over 8 primary and secondary DNS servers from google, versign, cloudfare, etc. The scan is rate limited to 10 simultaneous outstanding requests. Contact: jean-pierre.smith@inf.ethz.ch.

QUIC-enabled hosts (March 2019; May 14-17, 2019). This scan checks for QUIC-enabled hosts using a UDP QUIC CHLO packet on port 443. Contact: jean-pierre.smith@inf.ethz.ch.

MPTCP-enabled domains (December 2019). Connecting to multiple domains to check support for MPTCP option. Contact: jean-pierre.smith@inf.ethz.ch.