diff --git a/src/util_net.rs b/src/util_net.rs
index 0f843da..aa002b4 100644
--- a/src/util_net.rs
+++ b/src/util_net.rs
@@ -1,3 +1,5 @@
+use std::fmt::{ Display, Formatter };
+use std::result::Result;
 use std::net::SocketAddr;
 use crate::XResult;
 
@@ -24,6 +26,12 @@ impl IpAddress {
     }
 }
 
+impl Display for IpAddress {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), std::fmt::Error> {
+        write!(f, "{}", self.to_address())
+    }
+}
+
 #[derive(Debug, Clone)]
 pub enum IpAddressMask {
     Ipv4([u8; 4], u8),
@@ -72,6 +80,12 @@ impl IpAddressMask {
     }
 }
 
+impl Display for IpAddressMask {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), std::fmt::Error> {
+        write!(f, "{}", self.to_address())
+    }
+}
+
 fn ipv4_mask(mask: u8) -> u32 {
     let mut r = 0_u32;
     for _ in 0..mask {