| Country | Institution |
| Argentina | Facultad de Ciencias Astronomicas y Geofisicas, |
| Buenos Aires | |
| Austria | Kuffner Observatory, Vienna |
| Belgium | Royal Observatory of Belgium, Ukkel |
| Brazil | Instituto Astronomico e Geofisico, Sao Paulo |
| Canada | Canadian Astronomy Data Center, Victoria |
| (Principal Centre Mirror Site) | |
| China | Center for Astrophysics, |
| Hefei (local access only) | |
| ESO | European Southern Observatory, Garching |
| (local access only) | |
| Israel | Wise Observatory, Tel Aviv University, Tel Aviv |
| France | Centre de Donees Astronomiques, Strasbourg |
| Italy | Astronomical Observatory, Trieste |
| Japan | National Astronomical Observatory, Tokyo |
| Korea | Chungbuk National University, Cheongju |
| The Netherlands | Astronomical Institute, Utrecht |
| Poland | Center for Astronomy, Torun |
| Russia | Institute of Astronomy of the Russian Academy of |
| Sciences, Moscow | |
| Spain | LAEFF, Madrid (Principal Centre) |
| Sweden | Astronomical Observatory Uppsala |
| (serving the Nordic Countries) | |
| Taiwan | Institute of Physics and Astronomy, Chung-Li |
| United Kingdom | Rutherford Appleton Laboratory, Didcot |
| United States | Space Telescope Science Institute, Baltimore |