Welcome
As a researcher at the Max Planck Institue for Informatics, I focus on large scale analysis and measurements targeting the Internet. My core areas are the analysis of network deployments and their peculiarities. My work relies on multiple protocols spanning networking layers, such as IPv6, DNS, TLS, QUIC. The goal is to reach a better understanding of the Internet and the impact of often disregarded influences such as Off-Net deployments.
Previously, I did my PhD at the Chair of Network Architecures and Services at the Technical University of Munich.
I am co-leading the Global Internet Observatory (GINO), an interest focusing on Internet measurements. Over the years, we acquired vast knowledge in the area of large scale network measurements. This helps us to understand the current network state and its development. We seek to be harmless and conduct all measurements in an ethical manner.
Recent News
Max Planck Institue for Informatics
After five successful years as PhD student at the Technical University of Munich, I started a new position at the Internet Architectures group at the Max Planck Institute for Informatics.
IPv6 Hitlist Extension
QUIC Interest Group and IFIP 2023
Together with a colleague, I founded a QUIC Interest Group that brings together researchers and students with an interest in QUIC. Interests cover performance measurements, the analysis of different libraries but also Internet-wide measurements to evaluate QUIC deployments.
An outcome of this group, a performance evaluation of different libraries on a 10G link has been accepted to be published at IFIP Networking 2023. You can find a preprint of this work here
PAM 2023
One of our papers has been accepted to the PAM 2023.
APNIC blog: An investigation into Apple’s new Relay network
Patrick Sattler wrote a nice post on the APNIC blog about our recent investigation into Apple’s new Relay network iCloud Private Relay. Checkout our IMC 2022 publication for more information.
Selected Publications
It`s over 9000: Analyzing early QUIC Deployments with the Standardization on the Horizon
Johannes Zirngibl, Philippe Buschmann, Patrick Sattler, Benedikt Jaeger, Juliane Aulbach, Georg Carle, "It`s over 9000: Analyzing early QUIC Deployments with the Standardization on the Horizon." Proc. ACM Int. Measurement Conference (IMC), 2021.
Rusty Clusters? Dusting an IPv6 Research Foundation
Johannes Zirngibl, Lion Steger, Patrick Sattler, Oliver Gasser, Georg Carle, "Rusty Clusters? Dusting an IPv6 Research Foundation." Proc. ACM Int. Measurement Conference (IMC), 2022.
Towards a Tectonic Traffic Shift? Investigating Apple's New Relay Network
Patrick Sattler, Juliane Aulbach, Johannes Zirngibl, Georg Carle, "Towards a Tectonic Traffic Shift? Investigating Apple's New Relay Network." Proc. ACM Int. Measurement Conference (IMC), 2022.
QUIC Hunter: Finding QUIC Deployments and Identifying Server Libraries Across the Internet
Johannes Zirngibl, Florian Gebauer, Patrick Sattler, Markus Sosnowski, Georg Carle, "QUIC Hunter: Finding QUIC Deployments and Identifying Server Libraries Across the Internet." Proc. Passive and Active Measurement (PAM), 2024.
ECSeptional DNS Data: Evaluating Nameserver ECS Deployments with Response-Aware Scanning
Patrick Sattler, Johannes Zirngibl, Fahad Hilal, Oliver Gasser, Kevin Vermeulten, Georg Carle, Mattijs Jonker, "ECSeptional DNS Data: Evaluating Nameserver ECS Deployments with Response-Aware Scanning." Proc. ACM Netw., 2025.
QUIC Steps: Evaluating Pacing Strategies in QUIC Implementations
Marcel Kempf, Simon Tietz, Benedikt Jaeger, Johannes Sp{\"a}th, Georg Carle, Johannes Zirngibl, "QUIC Steps: Evaluating Pacing Strategies in QUIC Implementations." Proc. ACM Netw., 2025.
Lazy Eye Inspection: Capturing the State of Happy Eyeballs Implementations
Patrick Sattler, Matthias Kirstein, Lars Wüstrich, Johannes Zirngibl, Georg Carle, "Lazy Eye Inspection: Capturing the State of Happy Eyeballs Implementations." Proc. ACM Int. Measurement Conference (IMC), 2025.