The UCSD Network Telescope consists of a globally routed, but lightly utilized /8 network prefix, that is, 1/256th of the whole IPv4 address space. It contains few legitimate hosts; inbound traffic to non-existent machines - so called Internet Background Radiation (IBR) - is unsolicited and results from a wide range of events, including misconfiguration (e.g. mistyping an IP address), scanning of address space by attackers or malware looking for vulnerable targets, backscatter from randomly spoofed denial-of-service attacks, and the automated spread of malware. CAIDA continously captures this anomalous traffic discarding the legitimate traffic packets destined to the few reachable IP addresses in this prefix. We archive and aggregate these data, and provide this valuable resource to network security researchers.
This dataset represents raw traffic traces captured by the Telescope instrumentation and made available in near-real time as one-hour long compressed pcap files. We collect more than 3 TB of uncompressed IBR traffic traces data per day. The most recent 14 days of data are stored locally at CAIDA. Once data slides out of ths "near-real-time window", the pcap files are off-loaded to a tape storage. This historical Telescope data starting from 2008 are available by additional request.
Caveats that apply to this dataset
This dataset and the types of worm and denial-of-service attack traffic contained therein are representative only of some spoofed source denial-of-service attacks. Many denial-of-service attackers do not spoof source IP addresses when they attack their victim, in which case backscatter would not appear on a telescope. Attackers can also spoof in a non-random fashion, which will incur an uneven distribution of backscatter across the IPv4 address space, and may cause backscatter traffic to miss any telescope lenses. Note that the telescope does not send any packets in response, which also limits insight into the traffic it sees.
Data Access Policy
These data must be analyzed on CAIDA machines, and cannot be downloaded!
Academic researchers and US government agencies can request access through CAIDA by filling out and submitting the online form. It usually takes about five to ten business days to process your request. We carefully review each application and the decision to grant the data access is based on the merits of your proposed data use.
These data also may be available for corporate entities who participate in CAIDA's membership program. Information on membership levels, services, and rates can be requested by emailing email@example.com.
Once users are approved for access to this dataset, they will receive an account on the CAIDA machine that provides direct access to the Telescope data they requested. Accounts are valid for a nominal twelve months in which the research is expected to be completed. CAIDA strictly enforces a "take software to the data" policy for this dataset: all analysis must be performed on CAIDA computers; download of raw data is not allowed. CAIDA provides several basic tools to work with the dataset, including CoralReef and Corsaro. Researchers can also upload their own analysis software.
Acceptable Use Agreement
Access to these data is subject to the terms of the following CAIDA Acceptable Use Agreement (printable version in PDF format)
and the supplemental AUA below:
When referencing this data (as required by the AUA), please use:The CAIDA UCSD Network Telescope Traffic Dataset - < dates used >,Also, please, report your publication to CAIDA.
UCSD Network Telescope Datasets
- Historical and Near-Real-Time Network Telescope Dataset
- Aggregated Traffic Data in FlowTuple format
- Daily RSDoS Attack Metadata
- Two Years of Daily RSDoS Attack Metadata (downloadable paper supplement)
- Three Days Of Conficker Dataset
- CAIDA UCSD Network Telescope Traffic Samples
- Witty Worm Dataset
- Code-Red Worms Dataset
- Patch Tuesday Dataset
- Two Days in November 2008 Dataset
- Telescope Educational Dataset
- Telescope Dataset on the Sipscan
- Telescope Darknet Scanners Dataset
For more information about the use of these data in studies of internet censorship, see:
- A. Dainotti, C. Squarecella, E. Aben, K. Claffy, M. Chiesa, M. Russo, and A. Pescape, "Analysis of Country-wide Internet Outages Caused by Censorship",Internet Measur ement Conference (IMC), Berlin, Germany, Nov 2011, pp. 1--18, ACM
- A. Dainotti, R. Amman, E. Aben, and K. Claffy, "Extracting benefit from harm: using malware pollution to analyze the impact of political and geophysical events on the Internet", ACM SIGCOMM Computer Communication Review (CCR), vol. 42, no. 1, pp. 31--39, Jan 2012.
For more information on Conficker and worm attacks, see:
For more information on Backscatter and Denial-of-Service attacks, see:
For more information on the UCSD Network Telescope, see:
For more information on the CoralReef Software Suite, see:
For more information on the Corsaro Software Suite, see:
For a non-exhaustive list of Non-CAIDA publications using Network Telescope data, see: