diff --git a/tldextract/remote.py b/tldextract/remote.py
index 08b0722..8ac8311 100644
--- a/tldextract/remote.py
+++ b/tldextract/remote.py
@@ -7,8 +7,9 @@
 from urllib.parse import scheme_chars
 
 IP_RE = re.compile(
-    r"^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.)"
-    r"{3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$"
+    r"^(?:(?:[0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.)"
+    r"{3}(?:[0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$",
+    re.ASCII,
 )
 
 scheme_chars_set = set(scheme_chars)