diff --git a/core/utils.py b/core/utils.py
index 07ce400..d4e8e30 100644
--- a/core/utils.py
+++ b/core/utils.py
@@ -85,12 +85,8 @@ def infer_band_from_freq(freq):
 # Infer a country name from a callsign
 def infer_country_from_callsign(call):
     try:
-        # Use the full callsign, falling back to the base callsign, assuming this will be the longest of any /-separated
-        # sections.
+        # Start with the basic country-files.com-based decoder.
         country = CALL_INFO_BASIC.get_country_name(call)
-        if not country:
-            base_call = max(call.split("/"), key=len)
-            country = CALL_INFO_BASIC.get_country_name(base_call)
     except KeyError as e:
         country = None
     # Couldn't get anything from basic call info database, try QRZ.com
@@ -118,13 +114,8 @@ def infer_country_from_callsign(call):
 # Infer a DXCC ID from a callsign
 def infer_dxcc_id_from_callsign(call):
     try:
-        # Start with the basic country-files.com-based decoder. Use the full callsign, falling back to the base
-        # callsign, assuming this will be the longest of any /-separated sections. Then if that doesn't provide data,
-        # and we have QRZ data, try the same with that.
+        # Start with the basic country-files.com-based decoder.
         dxcc = CALL_INFO_BASIC.get_adif_id(call)
-        if not dxcc:
-            base_call = max(call.split("/"), key=len)
-            dxcc = CALL_INFO_BASIC.get_adif_id(base_call)
     except KeyError as e:
         dxcc = None
     # Couldn't get anything from basic call info database, try QRZ.com
@@ -152,12 +143,8 @@ def infer_dxcc_id_from_callsign(call):
 # Infer a continent shortcode from a callsign
 def infer_continent_from_callsign(call):
     try:
-        # Start with the basic country-files.com-based decoder. Use the full callsign, falling back to the base
-        # callsign, assuming this will be the longest of any /-separated sections.
+        # Start with the basic country-files.com-based decoder.
         continent = CALL_INFO_BASIC.get_continent(call)
-        if not continent:
-            base_call = max(call.split("/"), key=len)
-            continent = CALL_INFO_BASIC.get_continent(base_call)
     except KeyError as e:
         continent = None
     # Couldn't get anything from basic call info database, try Clublog data
@@ -180,13 +167,8 @@ def infer_continent_from_callsign(call):
 # Infer a CQ zone from a callsign
 def infer_cq_zone_from_callsign(call):
     try:
-        # Start with the basic country-files.com-based decoder. Use the full callsign, falling back to the base
-        # callsign, assuming this will be the longest of any /-separated sections. Then if that doesn't provide data,
-        # and we have QRZ data, try the same with that.
+        # Start with the basic country-files.com-based decoder.
         cqz = CALL_INFO_BASIC.get_cqz(call)
-        if not cqz:
-            base_call = max(call.split("/"), key=len)
-            cqz = CALL_INFO_BASIC.get_cqz(base_call)
     except KeyError as e:
         cqz = None
     # Couldn't get anything from basic call info database, try QRZ.com
@@ -214,13 +196,8 @@ def infer_cq_zone_from_callsign(call):
 # Infer a ITU zone from a callsign
 def infer_itu_zone_from_callsign(call):
     try:
-        # Start with the basic country-files.com-based decoder. Use the full callsign, falling back to the base
-        # callsign, assuming this will be the longest of any /-separated sections. Then if that doesn't provide data,
-        # and we have QRZ data, try the same with that.
+        # Start with the basic country-files.com-based decoder.
         ituz = CALL_INFO_BASIC.get_ituz(call)
-        if not ituz:
-            base_call = max(call.split("/"), key=len)
-            ituz = CALL_INFO_BASIC.get_ituz(base_call)
     except KeyError as e:
         ituz = None
     # Couldn't get anything from basic call info database, try QRZ.com