diff --git a/definitions/common/c-1.table b/definitions/common/c-1.table
index bdcbf023a..7a44dc743 100644
--- a/definitions/common/c-1.table
+++ b/definitions/common/c-1.table
@@ -65,15 +65,9 @@
 97 97 European Space Agency (ESA)
 98 ecmf European Centre for Medium-Range Weather Forecasts
 99 99 DeBilt, Netherlands
-#100 to 109 Reserved for centres in Region I which are not in the list above
 110 110 Hong-Kong
-#111 to 133 Reserved for centres in Region II which are not in the list above
-#134 to 153 Reserved for centres in Region I which are not listed above
-#154 to 159 Reserved for centres in Region III which are not in the list above
 160 160 US NOAA/NESDIS
-# 161 to 185 Reserved for centres in Region IV which are not in the list above
-# 186 to 198 Reserved for centres in Region I which are not listed above
-# 199 to 209 Reserved for centres in Region V which are not in the list above
+173 nasa US National Aeronautics and Space Administration (NASA)
 195 wiix Indonesia (NMC)
 204 niwa  National Institute of Water and Atmospheric Research (NIWA - New Zealand)
 # 205-209 Reserved
diff --git a/definitions/common/c-11.table b/definitions/common/c-11.table
index 4f613e477..5b4c96cdd 100644
--- a/definitions/common/c-11.table
+++ b/definitions/common/c-11.table
@@ -65,15 +65,9 @@
 97 97 European Space Agency (ESA)
 98 ecmf European Centre for Medium-Range Weather Forecasts
 99 99 DeBilt, Netherlands
-#100 to 109 Reserved for centres in Region I which are not in the list above
 110 110 Hong-Kong
-#111 to 133 Reserved for centres in Region II which are not in the list above
-#134 to 153 Reserved for centres in Region I which are not listed above
-#154 to 159 Reserved for centres in Region III which are not in the list above
 160 160 US NOAA/NESDIS
-# 161 to 185 Reserved for centres in Region IV which are not in the list above
-# 186 to 198 Reserved for centres in Region I which are not listed above
-# 199 to 209 Reserved for centres in Region V which are not in the list above
+173 nasa US National Aeronautics and Space Administration (NASA)
 195 wiix Indonesia (NMC)
 204 niwa  National Institute of Water and Atmospheric Research (NIWA - New Zealand)
 210 210  Frascati (ESA/ESRIN)