US Government security requirements no longer permit CDDIS to offer data via traditional unencrypted anonymous ftp; this service was discontinued on October 31, 2020. All data are still available, however access must be via HTTPS or ftp-ssl.

Instructions with examples and our FAQ can be found at:

If you still have difficulty after reading and attempting the examples on that page, please contact us at

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Other products available at CDDIS

The CDDIS provides access to general space geodesy-related products, such as Earth orientation parameters generated by the IERS Rapid Service/Prediction Center located at the U.S. Naval Observatory's Earth Orientation (EO) Department.