diff --git foolscap/referenceable.py foolscap/referenceable.py
index 7efbcb5..c15d706 100644
--- foolscap/referenceable.py
+++ foolscap/referenceable.py
@@ -763,6 +763,8 @@ AUTH_STURDYREF_RE = re.compile(r"pb://([^@]+)@([^/]+)/(.+)$")
 NONAUTH_STURDYREF_RE = re.compile(r"pbu://([^/]+)/(.+)$")
 
 IPV4_HINT_RE = re.compile(r"^([^:]+):(\d+)$")
+# I2P: Recognize I2P destinations
+I2P_HINT_RE = re.compile(r"^([a-z2-7]{52}\.b32\.i2p)$")
 def encode_location_hint(hint):
     assert hint[0] == "ipv4"
     host, port = hint[1:]
@@ -775,8 +777,14 @@ def decode_location_hints(hints_s):
             hint = ( "ipv4", mo.group(1), int(mo.group(2)) )
             hints.append(hint)
         else:
-            # some extension from the future that we will ignore
-            pass
+            mo = I2P_HINT_RE.search(hint_s)
+            if mo:
+                # I2P: destinations have no port
+                hint = ( "ipv4", mo.group(1), 0)
+                hints.append(hint)
+            else:
+                # some extension from the future that we will ignore
+                pass
     return hints
 
 class BadFURLError(Exception):