| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| C4 |
|
CERN Seismic Network | 2017 | 2599 |
| CH |
|
National Seismic Networks of Switzerland | 1980 | 2599 |
| CK |
|
CAREMON, Central Asian Cross-border Network (CAREMON) | 1980 | 2599 |
| CN |
|
Canadian National Seismograph Network | 1980 | 2599 |
| CP |
|
CIVISA Seismo-Volcanic Monitoring Network-Azores Islands | 2018 | 2599 |
| CX |
|
IPOC Seismic Network (Integrated Plate boundary Observatory Chile) | 1980 | 2599 |
| CZ |
|
Czech Regional Seismic Network | 1973 | 2599 |
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