| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| B6 |
|
Bransfield Strait Seismic Network | 2008 | 2599 |
| BC |
|
Red Sísmica del Noroeste de México | 1980 | 2599 |
| BE |
|
Belgian Seismic Network | 1985 | 2599 |
| BF |
|
Black Forest Observatory | 1979 | 1995 |
| BI |
|
University of Dhaka Seismographic Network | 2008 | 2599 |
| BK |
|
Berkeley Digital Seismograph Network | 1980 | 2599 |
| BL |
|
Brazilian Lithospheric Seismic Project | 1988 | 2599 |
| BN |
|
UK-Net, Blacknest Array | 1960 | 2599 |
| BV |
|
Bolvian Seismic Network | 1913 | 2599 |
| BX |
|
Botswana Seismological Network | 2001 | 2599 |
| N4 |
|
Central and Eastern US Network | 2013 | 2599 |
| NA |
|
Caribbean Netherlands Seismic Network | 2006 | 2599 |
| NB |
|
Northeastern Brazil UFRN | 2006 | 2599 |
| NC |
|
USGS Northern California Network | 1966 | 2599 |
| NE |
|
New England Seismic Network | 1994 | 2599 |
| NI |
|
North-East Italy Broadband Network | 2002 | 2599 |
| NJ |
|
Nigerian National Network of Seismographi Stations (NNNSS) | 2009 | 2599 |
| NK |
|
Nepal Kathmandu | 1978 | 2599 |
| NL |
|
Netherlands Seismic and Acoustic Network | 1993 | 2599 |
| NM |
|
Cooperative New Madrid Seismic Network | 1980 | 2599 |
| NN |
|
Nevada Seismic Network | 1971 | 2599 |
| NO |
|
Norwegian Seismic Array Network | 1971 | 2599 |
| NP |
|
United States National Strong-Motion Network | 1931 | 2599 |
| NQ |
|
NetQuakes | 1989 | 2599 |
| NR |
|
NARS | 1983 | 2599 |
| NT |
|
USGS Geomagnetism Program | 1901 | 2599 |
| NU |
|
Nicaraguan Seismic Network | 1975 | 2599 |
| NV |
|
NEPTUNE Canada | 2009 | 2599 |
| NW |
|
Northwestern University Seismic Network | 2011 | 2599 |
| NX |
|
Nanometrics Research Network | 2013 | 2599 |
| NY |
|
Yukon-Northwest Seismic Network | 2013 | 2599 |
| NZ |
|
New Zealand National Seismograph Network | 1988 | 2599 |
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