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Center for Applied Internet Data Analysis > data : active : topology_request.xml
CAIDA Topology Data Request Form

CAIDA makes topology data freely available to academic researchers and US government agencies. Corporate entities (including corporate researchers) receive access through CAIDA's membership program. Information on membership levels, services, and rates is found on the CAIDA Sponsorship Information page, or can be requested by emailing

CAIDA provides an industry evaluation dataset to corporate researchers to allow them to assess the usefulness of the CAIDA topology data for their research, and justify CAIDA membership for their organization.

If you have questions or problems using this form, please send email to

If your research only requires older IPv4 topology data (older than two years), or IPv6 data, you do not need to fill out this form. These older IPv4 topology data, and all IPv6 data are available as public datasets. You can obtain access using this form.

If your research involves:

  • finding links between Autonomous Systems (AS)
  • studying the Internet topology, or
  • obtaining Internet topology data for modeling
then you also do not need to fill in the form below. We recommend that you download, without prior approval, pre-computed AS-level graphs derived from Ark measurements. We distribute these curated AS graphs to help those researchers who don't need the raw IP or router granularity.

If you want access to the raw topology data, please complete and submit the following Topology Data Request Form. It usually takes about two to three business days to process your request. Upon approval, you will receive an email with instructions on how to download your requested data.

Required fields are indicated by an asterisk (*).
*Relationship to CAIDA:    I am an academic researcher / faculty advisor / student
   I am a CAIDA sponsor
   I am a U.S. government contractor
   I am from a U.S. government agency
   I am from a corporate organization
   Other (please specify):
*First (Given) Name: 
*Last (Family) Name: 
*Phone Number: 
*Full name of your Institution/Company: 
*Mailing Address: 
*Your email at this Institution/Company: 
(an academic email address is required for academic researchers/students)
*Position:     Professor/Principal investigator      
   Other (please specify):       
Advisor's Name (required for students): 
URL of your project
(if available): 
* These topology data include
  Ark IPv4 Topology Datasets (last two years only)
      (for academic and government users, and corporate CAIDA members)
      which includes:
If you already have a password to access CAIDA's Ark data, check the following box to retain the password.
Have password?    I already have a password, and would like to keep it.

* Please submit a detailed 1-2 paragraph description summarizing your research goals.
Sample descriptions from other projects can be found at

How many Phd students will use the data? (if applicable):   
How many Masters students will use the data? (if applicable):
How many other students will use the data? (if applicable):

CAIDA will do dataset related announcements, like the availability of a new datasets, on the mailinglist.

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Acceptable Use Agreement

CAIDA strongly favors wide dissemination of its datasets to legitimate researchers, and CAIDA also takes seriously its obligation to responsibly disclose datasets which may present a risk if misused.

Please read the terms of the CAIDA Acceptable Use Agreement below: (printable version in PDF format)

*Enter your initials if you have read and agree to the terms set forth above:    

When referencing this dataset, the use agreement requires inclusion of the following text:

The CAIDA UCSD IPv4 Routed /24 Topology Dataset - < dates used >,
The CAIDA UCSD IPv4 Routed /24 DNS Names Dataset - < dates used >,
The CAIDA UCSD Macroscopic Internet Topology Data Kit (ITDK) - < dates used >,
B. Huffaker, A. Dhamdhere, M. Fomenkov, and k. claffy,
"Toward Topology Dualism: Improving the Accuracy of AS Annotations for Routers",
Passive and Active Network Measurement Workshop (PAM), Zurich, Switzerland, Apr 2010, PAM 2010,
Also, please, report your publication to CAIDA.

  Last Modified: Thu Apr-7-2016 11:22:36 PDT
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