Thomas Krenc

UC San Diego

San Diego Supercomputer Center

9500 Gilman Drive

La Jolla, CA, 92093

I am a postdoctoral researcher at CAIDA, UC San Diego. Before that, I was a postdoc at the CMAND lab at NPS in Monterey, California. I completed my Ph.D. in computer science at the Internet Network Architectures (INET) group, Technische Universität Berlin.

My research efforts are directed towards the security and scalability of distributed systems, as well as the development of infrastructure and data-driven approaches to model and measure the Internet ecosystem.

Publications

The Next Generation of BGP Data Collection Platforms
Thomas Alfroy, Thomas Holterbach, Thomas Krenc, kc claffy, Cristel Pelsser, In ACM SIGCOMM'24, Best paper award!

[pdf] [website] [bib]

@inproceedings{alfroy2024next,
  title={The Next Generation of BGP Data Collection Platforms},
  author={Alfroy, Thomas and Holterbach, Thomas and Krenc, Thomas and Claffy, KC and Pelsser, Cristel},
  booktitle={Proceedings of the ACM SIGCOMM 2024 Conference},
  pages={794--812},
  year={2024}
}

Internet Science Moonshot: Expanding BGP Data Horizons
Thomas Alfroy, Thomas Holterbach, Thomas Krenc, kc claffy, Cristel Pelsser, In ACM HotNets'23

[pdf] [website] [bib]

@inproceedings{alfroy2023internet,
  title={Internet science moonshot: Expanding BGP data horizons},
  author={Alfroy, Thomas and Holterbach, Thomas and Krenc, Thomas and Claffy, KC and Pelsser, Cristel},
  booktitle={Proceedings of the 22nd ACM Workshop on Hot Topics in Networks},
  pages={102--108},
  year={2023}
}

Coarse-grained Inference of BGP Community Intent
Thomas Krenc, Matthew Luckie, Alexander Marder, kc claffy, In ACM IMC'23

[pdf] [website] [honorable mention] [bib]

@inproceedings{krenc2023coarse,
  title={Coarse-grained Inference of BGP Community Intent},
  author={Krenc, Thomas and Luckie, Matthew and Marder, Alexander and claffy, kc},
  booktitle={Proceedings of the 2023 ACM on Internet Measurement Conference},
  pages={66--72},
  year={2023}
}

IRR Hygiene in the RPKI Era, Ben Du, Gautam Akiwate, Thomas Krenc, Cecilia Testart, Alexander Marder, Bradley Huffaker, Alex C. Snoeren, and kc claffy, In PAM'22

[pdf] [bib]

@inproceedings{du2022irr,
  title={IRR Hygiene in the RPKI Era},
  author={Du, Ben and Akiwate, Gautam and Krenc, Thomas and Testart, Cecilia and Marder, Alexander and Huffaker, Bradley and Snoeren, Alex C and Claffy, Kimberly C},
  booktitle={International Conference on Passive and Active Network Measurement},
  pages={321--337},
  year={2022},
  organization={Springer}
}

AS-Level BGP Community Usage Classification
Thomas Krenc, Robert Beverly and Georgios Smaragdakis, In ACM IMC'21

[pdf] [website] [article] [bib]

@inproceedings{krenc2021level,
  title={AS-level BGP community usage classification},
  author={Krenc, Thomas and Beverly, Robert and Smaragdakis, Georgios},
  booktitle={Proceedings of the 21st ACM Internet Measurement Conference},
  pages={577--592},
  year={2021}
}

Keep your Communities Clean: Exploring the Routing Message Impact of BGP Communities, Thomas Krenc, Robert Beverly and Georgios Smaragdakis, In ACM CoNEXT'20

[pdf] [website] [bib]

@inproceedings{krenc2020keep,
  title={Keep your communities clean: exploring the routing message impact of BGP communities},
  author={Krenc, Thomas and Beverly, Robert and Smaragdakis, Georgios},
  booktitle={Proceedings of the 16th International Conference on emerging Networking EXperiments and Technologies},
  pages={443--450},
  year={2020}
}

BGP Prefix Delegations: A Deep Dive, Thomas Krenc and Anja Feldmann, In ACM IMC'16

[pdf] [bib]

@inproceedings{krenc2016bgp,
  title={BGP prefix delegations: a deep dive},
  author={Krenc, Thomas and Feldmann, Anja},
  booktitle={Proceedings of the 2016 Internet Measurement Conference},
  pages={469--475},
  year={2016}
}

An Internet Census Taken by an Illegal Botnet: A Qualitative Assessment of Published Measurements, Thomas Krenc, Oliver Hohlfeld and Anja Feldmann, In ACM SIGCOMM CCR (2014)

[link] [bib]

@misc{krenc2014internet,
  title={An internet census taken by an illegal botnet: a qualitative assessment of published measurements},
  author={Krenc, Thomas and Hohlfeld, Oliver and Feldmann, Anja},
  journal={ACM SIGCOMM Computer Communication Review},
  volume={44},
  number={3},
  pages={103--111},
  year={2014},
  publisher={ACM New York, NY, USA}
}

On the Benefits of Using a Large IXP As an Internet Vantage Point, Nikolaos Chatzis, Georgios Smaragdakis, Jan Boettger, Thomas Krenc and Anja Feldmann, In ACM IMC'13

[link] [bib]

@inproceedings{chatzis2013benefits,
  title={On the benefits of using a large IXP as an Internet vantage point},
  author={Chatzis, Nikolaos and Smaragdakis, Georgios and B{\"o}ttger, Jan and Krenc, Thomas and Feldmann, Anja},
  booktitle={Proceedings of the 2013 conference on Internet measurement conference},
  pages={333--346},
  year={2013}
}

Teaching

INGI Seminar, April 2024, UC Louvain

(guest lecture: "Location Inference of BGP Communities")

INFO8011 (Network Infrastructures), Fall 2023, University of Liège

(guest lecture: "Internet Exchange Points")

Distributed Systems, July 2023, University of Kassel
(guest lecture: "BGP Community Intents")

CSE291-e: Internet Data Science for Cybersecurity, Winter 2023, UCSD

(guest lecture: "BGP Communities")

CSE291: Internet Infrastructure, Fall 2021, UCSD

(guest lecture: "Why IXPs matter")

CS4538: Mobile Device and Wireless Security, Spring 2021, NPS

Network Protocols and Architectures, Fall 2012 - 2018, TU Berlin

(teaching assistant + lecturing)

Internet Routing Seminar, 2013 - 2018, TU Berlin

Internet Measurement Seminar, Spring 2014 - 2015, 2018, TU Berlin

RouterLab, Spring 2014, 2018, 2019, TU Berlin

Service

Internet Measurement Conference (IMC) 2024, 2025

Passive and Active Measurement (PAM) conference 2022, 2023, 2024, 2025

Bachelor / Master Thesis Supervision

BGP Smalltalk: A Systematic Analysis of BGP Attribute Changes

Kamil Balitzki, TU Berlin, 2022

Sources of Change in Internet Protocol Geolocation Databases

Bryan Kauffman, NPS, 2021

Autonomous System Choke Points in Country-Level Network Topology

Eric Regnier, NPS, 2021

Chasing the Unknown: A Predictive Model to Demystify BGP Community Semantics

Joshua Werner, NPS, 2020

Through the Looking Glass: Classifying Anomalous BGP Communities

Joshua Welch, NPS, 2020

The Earth is not a Sphere: On the Geographic Alignment of Autonomous Systems

Kamil Balitzki, TU Berlin, 2019

Re-evaluating the AS-level Multi-Tier Model

Lars Prehn, TU Berlin, 2018

On Inferring Primary AS Paths from BGP Routing Data

Omar Faruque, TU Berlin, 2018

Measurement and Characterization of Address Block Announcements from Different Vantage Points

Md Shihab Karim, TU Berlin, 2017

On the Potentials of Extending Conventional Measurement Tools for Network Deployments using ALTO

Johannes Schütze, TU Berlin, 2016

Measurement and Analysis of the SoShare Hybrid Server-P2P System

Li Boxuan, TU Berlin, 2016

Measuring the Indirect Prefix Delegation using Public Routing Information

Shen Jinji, TU Berlin, 2016