diff --git a/common/net/address.go b/common/net/address.go
index a5f7c160..1567e4d1 100644
--- a/common/net/address.go
+++ b/common/net/address.go
@@ -121,6 +121,11 @@ func IPAddress(ip []byte) Address {
 }
 
 // DomainAddress creates an Address with given domain.
+// This is an internal function that forcibly converts a string to domain.
+// It's mainly used in test files and mux.
+// Unless you have a specific reason, use net.ParseAddress instead,
+// as this function does not check whether the input is an IP address.
+// Otherwise, you will get strange results like domain: 1.1.1.1
 func DomainAddress(domain string) Address {
 	return domainAddress(domain)
 }
diff --git a/proxy/socks/protocol.go b/proxy/socks/protocol.go
index fe13f24f..9bccf607 100644
--- a/proxy/socks/protocol.go
+++ b/proxy/socks/protocol.go
@@ -74,7 +74,7 @@ func (s *ServerSession) handshake4(cmd byte, reader io.Reader, writer io.Writer)
 		if err != nil {
 			return nil, errors.New("failed to read domain for socks 4a").Base(err)
 		}
-		address = net.DomainAddress(domain)
+		address = net.ParseAddress(domain)
 	}
 
 	switch cmd {