| Network | Data Center | Description | Start Year | End Year |
|---|---|---|---|---|
| N4 |
|
Central and Eastern US Network | 2013 | 2599 |
| NA |
|
Caribbean Netherlands Seismic Network | 2006 | 2599 |
| NB |
|
Northeastern Brazil UFRN | 2006 | 2599 |
| NC |
|
|
|
|
| ND |
|
New-Caledonia broadband and accelerometric permanent networks | 2010 | 2500 |
| 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 |
|
|
|
|
| NO |
|
|
|
2599 |
| NP |
|
United States National Strong-Motion Network |
|
|
| NQ |
|
NetQuakes | 1989 | 2599 |
| NR |
|
|
|
|
| NS |
|
UIB | 1980 | 2599 |
| NT |
|
USGS Geomagnetism Program | 1901 | 2599 |
| NU |
|
|
|
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 |
| RA |
|
RESIF-RAP Accelerometric permanent network | 1995 | 2500 |
| RB |
|
|
2002 |
|
| RC |
|
BYU-Idaho Network | 2001 | 2599 |
| RD |
|
CEA/DASE broad-band permanent network | 1962 | 2500 |
| RE |
|
|
|
|
| RF |
|
Friuli Venezia Giulia Accelerometric Network, Italy | 1993 | 2599 |
| RI |
|
National Seismic Network of Argentina | 1972 | 2599 |
| RM |
|
Regional Integrated Multi-Hazard Early Warning System | 2008 | 2599 |
| RN |
|
RuhrNet - Ruhr-University Bochum, Germany | 1980 | 2599 |
| RO |
|
Romanian Seismic Network |
|
2599 |
| RS |
|
Regional Seismic Test Network | 1982 | 1986 |
| RV |
|
Regional Alberta Observatory for Earthquake Studies Network | 2013 | 2599 |
| RW |
|
Rwanda National Seismic Network | 2019 | 2599 |
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