| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| K5 |
|
Bhutan Seismic Network | 2017 | 2599 |
| KC |
|
|
|
2599 |
| KD |
|
Decentralized onsite earthquake early warning network Bishkek | 2012 | 2599 |
| KG |
|
Korean Seismic Network - KIGAM | 1997 | 2599 |
| KN |
|
Kyrgyz Seismic Telemetry Network | 1991 | 2599 |
| KO |
|
|
1971 | 2599 |
| KP |
|
|
|
2599 |
| KQ |
|
CAU Kiel | 1980 | 2599 |
| KR |
|
Kyrgyz Digital Network | 2007 | 2599 |
| KS |
|
Korea National Seismography Network (KNSN-KMA) | 2006 | 2599 |
| KT |
|
KROTONE SEISMIC NETWORK | 2003 | 2599 |
| KV |
|
KivuSNet | 2013 | 2022 |
| KW |
|
Kuwait National Seismic Network | 1997 | 2599 |
| KY |
|
Kentucky Seismic and Strong Motion Network | 1982 | 2599 |
| KZ |
|
Kazakhstan Network | 1994 | 2599 |
| O2 |
|
Oklahoma Consolidated Temporary Seismic Networks | 2018 | 2599 |
| OC |
|
Observatorio Sismológico CIGEOBIO CONICET | 2017 | 2599 |
| OE |
|
Austrian Seismic Network |
|
2599 |
| OH |
|
Ohio Seismic Network | 1999 | 2599 |
| OI |
|
Oceania International | 2023 | 2599 |
| OK |
|
Oklahoma Seismic Network | 1978 | 2599 |
| ON |
|
|
|
2599 |
| OO |
|
Ocean Observatories Initiative | 2013 | 2599 |
| OQ |
|
Oklahoma Structural and Site Effects Network | 2017 | 2599 |
| OR |
|
Orka Natturunnar | 2016 | 2021 |
| OT |
|
OTRIONS Local Seismic Network, Apulia, Italy | 2013 | 2599 |
| OV |
|
Observatorio Vulcanológico y Sismológico de Costa Rica | 1984 | 2599 |
| OW |
|
Ocean Networks Canada Onshore Network | 2018 | 2599 |
| OX |
|
North-East Italy Seismic Network | 2016 | 2599 |
| OY |
|
OGS Mobile LAB | 2019 | 2599 |
| OZ |
|
SRC eqServer | 1976 | 2599 |
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