| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| DE |
|
Nanometrics Research Network | 2013 | 2599 |
| DK |
|
Danish Seismological Network | 1976 | 2599 |
| DR |
|
Centro Nacional de Sismologia (CNS) | 1998 | 2599 |
| DT |
|
Carnegie Analog Broadband Seismograph Network | 1965 | 2003 |
| DU |
|
Seismological Association of Australia | 1995 | 2599 |
| DW |
|
Digital World-Wide Standardized Seismograph Network | 1980 | 1994 |
| IC |
|
New China Digital Seismograph Network | 1992 | 2599 |
| ID |
|
Project IDA VLP Seismometer Network - UCSD/SIO/IGPP | 1975 | 1995 |
| IE |
|
INL Seismic Monitoring Program | 1972 | 2599 |
| II |
|
Global Seismograph Network - IRIS/IDA | 1986 | 2599 |
| IL |
|
Iranian Long Period Array | 1966 | 1979 |
| IM |
|
International Miscellaneous Stations | 1965 | 2599 |
| IN |
|
National Seismic Network of India | 2000 | 2599 |
| IO |
|
International OGS Network | 2014 | 2599 |
| IP |
|
Instituto Superior Tecnico Broadband Seismic Network | 2002 | 2599 |
| IU |
|
Global Seismograph Network - IRIS/USGS | 1988 | 2599 |
| IV |
|
Italian National Seismic Network | 1988 | 2599 |
| IW |
|
Intermountain West Seismic Network | 2003 | 2599 |
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by the CoreTrustSeal Standards and Certification Board
