diff --git a/core/network.cpp b/core/network.cpp
index 08a1197..bc0db72 100644
--- a/core/network.cpp
+++ b/core/network.cpp
@@ -48,7 +48,7 @@
 Network::getMaxRangeV4()
 {
   using boost::asio::ip::address_v4;
-  static Network range{address_v4{}, address_v4{0xffffffff}};
+  static const Network range{address_v4{}, address_v4{0xffffffff}};
   return range;
 }
 
@@ -56,9 +56,9 @@
 Network::getMaxRangeV6()
 {
   using boost::asio::ip::address_v6;
-  static address_v6::bytes_type maxV6 = {{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-                                          0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}};
-  static Network range{address_v6{}, address_v6{maxV6}};
+  static const address_v6::bytes_type maxV6 = {{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                                                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}};
+  static const Network range{address_v6{}, address_v6{maxV6}};
   return range;
 }
 
@@ -96,8 +96,8 @@
   size_t position = networkStr.find('/');
   if (position == std::string::npos) {
     try {
-      network.m_minAddress = ip::address::from_string(networkStr);
-      network.m_maxAddress = ip::address::from_string(networkStr);
+      network.m_minAddress = ip::make_address(networkStr);
+      network.m_maxAddress = ip::make_address(networkStr);
     }
     catch (const boost::system::system_error&) {
       is.setstate(std::ios::failbit);
@@ -106,7 +106,7 @@
   }
   else {
     boost::system::error_code ec;
-    auto address = ip::address::from_string(networkStr.substr(0, position), ec);
+    auto address = ip::make_address(networkStr.substr(0, position), ec);
     if (ec) {
       is.setstate(std::ios::failbit);
       return is;