diff --git a/copyparty/httpcli.py b/copyparty/httpcli.py
index 4cf02a9f..19712af4 100644
--- a/copyparty/httpcli.py
+++ b/copyparty/httpcli.py
@@ -264,9 +264,10 @@ class HttpCli(object):
         self.is_https = (
             self.headers.get("x-forwarded-proto", "").lower() == "https" or self.tls
         )
-        self.host = self.headers.get("host") or "{}:{}".format(
-            *list(self.s.getsockname()[:2])
-        )
+        self.host = self.headers.get("host")
+        if not self.host:
+            zs = "{}:{}".format(*list(self.s.getsockname()[:2]))
+            self.host = zs[7:] if zs.startswith("::ffff:") else zs
 
         n = self.args.rproxy
         if n: