Global INternet Observatory


Internet measurements have long been a research priority at our chair. These measurements help us better understand the Internet and its security.

GINO is a research group for exchanging ongoing research, concepts, and ideas in the Internet measurement domain. Researchers and students meet once every month to discuss current topics, advancements, tools, and best practices in measurements.

Internet-wide scans

We conduct various regular and ad-hoc Internet-wide scans for protocols such as HTTPS, DNS, and BACnet. These are purely scientific and we never attempt to intrude into any system. We follow best practices laid out by the scientific community such as by Dittrich et al. 1, and Partridge and Allman 2.
If you are affected by these, e.g., because of IDS alerts, please contact us and we will be happy to blacklist you immediately. The involved machines are:

Host IPv6 address IPv4 address 2001:4ca0:108:42::X 138.246.253.X
dallas 2600:3c00::f03c:91ff:fe3b:d2d
singapore 2400:8901::f03c:91ff:fe3b:d08

For a brief time in February 2018, the rDNS pointer for points to

IPv6 Hitlist

We provide a daily updated IPv6 hitlist which can be downloaded by interested researchers. Find more information on our dedicated IPv6 hitlist page.

Monthly GINO meeting

We meet every month for about one hour. The audience of the monthly meetings are:

  • Interested researchers from the chair
  • Interested researchers from other chairs
  • Students currently doing a thesis or project in the area of Internet-wide measurements
  • Students who are interested in doing a thesis in the Internet-measurement domain


If this sounds interesting to you, feel free to contact us:


  1. D. Dittrich, E. Kenneally et al., “The Menlo Report: Ethical Principles Guiding Information and Communication Technology Research,” US Department of Homeland Security, 2012.

  2. C. Partridge and M. Allman, “Ethical Considerations in Network Measurement Papers”, Communications of the ACM, 2016.

Related publications

2019-03-01 Wouter B. de Vries, Quirin Scheitle, Moritz Müller, Willem Toorop, Ralph Dolmans, Roland van Rijswijk-Deij, “A First Look at QNAME Minimization in the Domain Name System,” in Proceedings of the Passive and Active Measurement Conference (PAM 2019), Best Dataset Award, Puerto Varas, Chile, Mar. 2019. [Url] [Bib]
2018-11-01 Quirin Scheitle, Oliver Gasser, Theodor Nolte, Johanna Amann, Lexi Brent, Georg Carle, Ralph Holz, Thomas C. Schmidt, Matthias Wählisch, “The Rise of Certificate Transparency and Its Implications on the Internet Ecosystem,” in Internet Measurement Conference (2018), Boston, USA, Nov. 2018, pp. 343–349. [Rawdata] [Arxiv] [DOI] [Bib]
2018-11-01 Oliver Gasser, Quirin Scheitle, Pawel Foremski, Qasim Lone, Maciej Korczynski, Stephen D. Strowes, Luuk Hendriks, Georg Carle, “Clusters in the Expanse: Understanding and Unbiasing IPv6 Hitlists,” in Proceedings of the 2018 Internet Measurement Conference, New York, NY, USA, Nov. 2018. [Pdf] [Slides] [Homepage] [Rawdata] [Arxiv] [Blog] [DOI] [Bib]
2018-11-01 Quirin Scheitle, Oliver Hohlfeld, Julien Gamba, Jonas Jelten, Torsten Zimmermann, Stephen D. Strowes, Narseo Vallina-Rodriguez, “A Long Way to the Top: Significance, Structure, and Stability of Internet Top Lists,” in Internet Measurement Conference (IMC’18), IMC’18 Community Contribution Award, Boston, USA, Nov. 2018, pp. 478–493. [Homepage] [Rawdata] [Arxiv] [DOI] [Bib]
2018-10-01 Paul Emmerich, Maximilian Pudelko, Quirin Scheitle, Georg Carle, “Efficient Dynamic Flow Tracking for Packet Analyzers,” in CloudNet, Tokyo, Japan, Oct. 2018. [Pdf] [Bib]
2018-04-01 Quirin Scheitle, Taejoong Chung, Jens Hiller, Oliver Gasser, Johannes Naab, Roland van Rijswijk-Deij, Oliver Hohlfeld, Ralph Holz, Dave Choffnes, Alan Mislove, Georg Carle, “A First Look at Certification Authority Authorization (CAA),” ACM SIGCOMM Computer Communications Review (CCR), Apr. 2018. [Url] [Pdf] [Preprint] [Homepage] [Rawdata] [Bib]
2018-03-01 Tobias Brunnwieser, Oliver Gasser, Sree Harsha Totakura, Georg Carle, “Live Detection and Analysis of HTTPS Interceptions,” in Passive and Active Measurement Conference (PAM), Poster, Berlin, Germany, Mar. 2018. [Pdf] [Poster] [Bib]
2018-03-01 Oliver Gasser, Benjamin Hof, Max Helm, Maciej Korczynski, Ralph Holz, Georg Carle, “In Log We Trust: Revealing Poor Security Practices with Certificate Transparency Logs and Internet Measurements,” in Proceedings of the Passive and Active Measurement Conference (PAM 2018), Best Paper Award, Berlin, Germany, Mar. 2018. [Url] [Pdf] [Slides] [Sourcecode] [Rawdata] [Blog] [Bib]
2018-03-01 Quirin Scheitle, Jonas Jelten, Oliver Hohlfeld, Luca Ciprian, Georg Carle, “Structure and Stability of Internet Top Lists,” in PAM’18 Poster, Berlin, Mar. 2018. [Arxiv] [Bib]
2017-11-01 Johanna Amann*, Oliver Gasser*, Quirin Scheitle*, Lexi Brent, Georg Carle, Ralph Holz, “Mission Accomplished? HTTPS Security after DigiNotar,” in Proceedings of the Internet Measurement Conference (IMC 2017), IMC’17 Community Contribution Award, IRTF Applied Networking Research Prize (ANRP) 2018, London, UK, Nov. 2017. [Url] [Pdf] [Slides] [Sourcecode] [Rawdata] [Bib]
2017-11-01 Patricia Callejo, Connor Kelton, Narseo Vallina-Rodriguez, Rubén Cuevas, Oliver Gasser, Christian Kreibich, Florian Wohlfart, Ángel Cuevas, “Opportunities and Challenges of Ad-based Measurements from the Edge of the Network,” in Proc. of the 16th ACM Workshop on Hot Topics in Networks, Nov. 2017. [Pdf] [Bib]
2017-10-01 Oliver Gasser, Quirin Scheitle, Benedikt Rudolph, Carl Denis, Nadja Schricker, Georg Carle, “The Amplification Threat Posed by Publicly Reachable BACnet Devices,” Journal of Cyber Security and Mobility, Oct. 2017. [Url] [Pdf] [Bib]
2017-08-01 Quirin Scheitle, Matthias Wählisch, Oliver Gasser, Thomas C. Schmidt, Georg Carle, “Towards an Ecosystem for Reproducible Research in Computer Networking,” in ACM SIGCOMM Reproducibility Workshop, Los Angeles, USA, Aug. 2017. [Pdf] [Slides] [Bib]
2017-06-01 Matthias Wachs, Quirin Scheitle, Georg Carle, “Push Away Your Privacy: Precise User Tracking Based on TLS Client Certificate Authentication,” in Network Traffic Measurement and Analysis Conference (TMA), Best Paper Award TMA’17, IEEE ComSoc ITC Best Paper Award 2017, Jun. 2017. [Pdf] [Slides] [Recording] [Bib]
2017-06-01 Quirin Scheitle, Oliver Gasser, Patrick Sattler, Georg Carle, “HLOC: Hints-Based Geolocation Leveraging Multiple Measurement Frameworks,” in Network Traffic Measurement and Analysis Conference (TMA), Best Dataset Award, Dublin, Ireland, Jun. 2017. [Pdf] [Slides] [Rawdata] [Arxiv] [Bib]
2017-06-01 Quirin Scheitle, Oliver Gasser, Minoo Rouhi, Georg Carle, “Large-Scale Classification of IPv6-IPv4 Siblings with Variable Clock Skew,” in Network Traffic Measurement and Analysis Conference (TMA), Jun. 2017. [Pdf] [Slides] [Rawdata] [Recording] [Arxiv] [Bib]
2017-05-01 Oliver Gasser, Quirin Scheitle, Carl Denis, Nadja Schricker, Georg Carle, “Security Implications of Publicly Reachable Building Automation Systems,” in Proc. 2nd Int. Workshop on Traffic Measurements for Cybersecurity, San Jose, CA, USA, May 2017. [Pdf] [Bib]
2017-02-01 Oliver Gasser, Quirin Scheitle, Carl Denis, Nadja Schricker, Georg Carle, “Öffentlich erreichbare Gebäudeautomatisierung: Amplification-Anfälligkeit von BACnet und Deployment-Analyse im Internet und DFN,” in 24. DFN-Konferenz Sicherheit in vernetzten Systemen, Hamburg, Germany, Feb. 2017. [Pdf] [Bib]
2016-04-01 Oliver Gasser, Quirin Scheitle, Sebastian Gebhard, Georg Carle, “Scanning the IPv6 Internet: Towards a Comprehensive Hitlist,” in Proc. 8th Int. Workshop on Traffic Monitoring and Analysis, Louvain-la-Neuve, Belgium, Apr. 2016. [Url] [Pdf] [Slides] [Bib]
2016-03-01 Quirin Scheitle, Matthias Wachs, Johannes Zirngibl, Georg Carle, “Analyzing Locality of Mobile Messaging Traffic using the MATAdOR Framework,” in Passive and Active Measurements Conference (PAM) 2016 , Heraklion, Greece, Mar. 2016, pp. 190–202. [Pdf] [Preprint] [Slides] [Homepage] [Rawdata] [DOI] [Bib]

Finished student theses

Author Title Type Advisors Year Links
Johannes Schleger Detection and Characterization of TLS Interception in Access Networks MA Jonas Jelten, Florian Wohlfart, Quirin Scheitle 2018
Glenn Skjong Internet Toplists: Creating an Alternative Internet Top List Service MA Quirin Scheitle, Jonas Jelten 2018
Ralf Baun Performance and Security Analysis of Alternative DNS Transports BA Quirin Scheitle, Johannes Naab 2018 Pdf
Felix Beil Long Term Analysis of HTTP Strict Transport Security BA Quirin Scheitle, Oliver Gasser 2018
Hamza Zafar Amplification Attack Detection using Active Measurements MA Simon Bauer, Oliver Gasser, Stefan Metzger 2018 Pdf
Emanuel Vintila Continuous Development of Open Source C++ Flow Toolkit HiWi Oliver Gasser, Johannes Naab 2017 Pdf
Alexander Schulz Identification of IPv6-IPv4 Sibling Pairs from Passive Observations BA Quirin Scheitle, Oliver Gasser, Minoo Rouhi 2017 Pdf
Thomas Bachmaier Scanning for TCP SYN Proxy Implementations BA Dominik Scholz, Paul Emmerich, Quirin Scheitle, Minoo Rouhi 2017 Pdf
Samy el Deib Detecting IPv6-IPv4 Sibling Pairs Based on few Data Points BA Quirin Scheitle, Oliver Gasser, Minoo Rouhi 2017 Pdf
Fabian Raab Influence of BGP Community Attributes on Routing and Internet Traffic IDP Oliver Gasser, Quirin Scheitle, Christoph Dietzel 2017 Pdf
Tobias Brunnwieser A Framework for Detection and Analysis of HTTPS Interception MA Oliver Gasser, Sree Harsha Totakura, Florian Wohlfart 2017
Max Helm Traceable Measurement Result Publication in Append-only Ledgers MA Oliver Gasser, Benjamin Hof, Quirin Scheitle 2017 Pdf
Florens Werner Finding Active IPv6 Addresses BA Quirin Scheitle, Oliver Gasser, Johannes Naab 2017 Pdf
Jan-Philipp Lauinger Evaluating Client Discrimination in Anonymization Networks Using Active Network Scans Forschungspraxis Oliver Gasser, Sree Harsha Totakura 2017 Pdf
Hendrik Eichner Revisiting SSH Security in the Internet BA Oliver Gasser, Minoo Rouhi 2017 Pdf
Markus Sosnowski Internet-Wide Assessment of TCP Options BA Quirin Scheitle, Oliver Gasser, Minoo Rouhi, Paul Emmerich, Dominik Scholz 2017 Pdf
Max Helm Evaluating TLS Certificate Transparency Logs using Active Scans IDP Oliver Gasser, Benjamin Hof 2017 Pdf
Maximilian Pudelko Payload Extraction for Flows with Anomalous TTL Behaviour IDP Quirin Scheitle, Paul Emmerich 2017 Pdf
Pirmin Blanz IPv6 TLS Security Scanning MA Oliver Gasser, Quirin Scheitle 2016
Michael Köpferl Evaluation of amplification attacks in large-scale networks to improve detection performance IDP Oliver Gasser, Stefan Metzger 2016
Frank Schmidt Large Scale DNS Scanner in Go MA Johannes Naab, Oliver Gasser 2016
Patrick Sattler Parsing geographical locations from DNS names GR Quirin Scheitle, Oliver Gasser 2016
Sven Hertle Analysis of cellular ISP networks MA Florian Wohlfart 2016 Pdf
Jonas Heintzenberg Browser-based Internet connection testing BA Florian Wohlfart, Oliver Gasser 2016 Pdf
Johannes Fischer Browser-based Internet connection testing MA Florian Wohlfart, Oliver Gasser 2016 Pdf