diff --git a/setup.cfg b/setup.cfg
index 923a674..21f263a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -3,7 +3,7 @@
 
 [metadata]
 name = netcup-dns
-version = 0.2.2
+version = 0.2.3
 author = Daniel Langbein
 author_email = daniel@systemli.org
 description = Update DNS records with your current external IP address using the netcup DNS API.
diff --git a/src/netcup_dns/main.py b/src/netcup_dns/main.py
index d88012c..b67fbb0 100644
--- a/src/netcup_dns/main.py
+++ b/src/netcup_dns/main.py
@@ -241,7 +241,8 @@ def external_ip(version: Type[ipaddress.IPv4Address | ipaddress.IPv6Address], ti
         # Return IP address as string.
         return parsed_ip.exploded
 
-    raise UnknownIPException('Could not determine public IP address.')
+    version_str = 'IPv4' if version == ipaddress.IPv4Address else 'IPv6'
+    raise UnknownIPException(f'Could not determine public {version_str} address.')
 
 
 @lru_cache(maxsize=None)