On this page, we provide concise technical background information about our measurement. This information is targeted at DNS operators and academic researchers.
The goal of the OpenINTEL measurement platform is to capture daily snapshots of the state of large parts of the global Domain Name System. Because the DNS plays a key role in almost all Internet services, recording this information allows us to track changes on the Internet, and thus its evolution, over longer periods of time. By performing active measurements, rather than passively collecting DNS data, we build consistent and reliable time series of the state of the DNS.
The measurement system will send a fixed set of DNS queries, which it sends once every 24 hours for every second-level domain in a TLD. This set of queries currently consists of the following queries:
All response records, including full CNAME expansions and RRSIG signature records are stored.
As a DNS operator, you can expect that our measurement system will send you 11 queries per day per domain you operate, and in case the domain is DNSSEC-signed, 12 queries. The system has been designed to distribute measurements over time, to reduce the impact the measurement has on busy name servers that are authoritative for large numbers of domains. We regularly inspect flow information about our measurements to monitor query rates. In general, only if you operate a very busy name server in terms of numbers of domains, should our measurement be visible in statistics. If you are a DNS operator and you feel our measurement is impacting your infrastructure, please read on.
Please go to our Problems page for information on how to contact us and how you can block our traffic if necessary.
The data collected by the OpenINTEL measurement platform will only be used for academic research and may not be used for commercial purposes. Read more about getting access to data for research on our Data Access page.
If you would like to learn more about how OpenINTEL works, please consult one of the references below. These academic papers are devoted to the design and use of OpenINTEL.
A High-Performance, Scalable Infrastructure for Active DNS Measurements
In IEEE Journal of Selected Areas in Communications, Volume 34, Issue 7
The Internet of Names: a DNS Big Dataset
Actively Measuring 50% of the Entire DNS Name Space, Every Day
In Proceedings of ACM SIGCOMM 2015, August 17-21 2015, London, UK