diff --git a/src/Tingle.AspNetCore.Authorization/ApprovedIPNetworkRequirement.cs b/src/Tingle.AspNetCore.Authorization/ApprovedIPNetworkRequirement.cs
index f8398d9..9b95e65 100644
--- a/src/Tingle.AspNetCore.Authorization/ApprovedIPNetworkRequirement.cs
+++ b/src/Tingle.AspNetCore.Authorization/ApprovedIPNetworkRequirement.cs
@@ -7,7 +7,11 @@ namespace Tingle.AspNetCore.Authorization;
 /// An <see cref="IAuthorizationRequirement"/> that contains IP networks
 /// </summary>
 /// <param name="networks">the networks allowed</param>
+#if NET8_0_OR_GREATER
 public sealed class ApprovedIPNetworkRequirement(IList<IPNetwork> networks) : IAuthorizationRequirement
+#else
+public sealed class ApprovedIPNetworkRequirement(IList<IPNetwork2> networks) : IAuthorizationRequirement
+#endif
 {
     /// <summary>
     /// Checks is an instance of <see cref="IPAddress"/> is approved
diff --git a/src/Tingle.AspNetCore.Authorization/AuthorizationPolicyBuilderExtensions.cs b/src/Tingle.AspNetCore.Authorization/AuthorizationPolicyBuilderExtensions.cs
index 24614f6..09c07e7 100644
--- a/src/Tingle.AspNetCore.Authorization/AuthorizationPolicyBuilderExtensions.cs
+++ b/src/Tingle.AspNetCore.Authorization/AuthorizationPolicyBuilderExtensions.cs
@@ -19,15 +19,18 @@ public static class AuthorizationPolicyBuilderExtensions
     /// </summary>
     /// <param name="builder">The instance to add to</param>
     /// <param name="networks">The allowed networks</param>
-    public static AuthorizationPolicyBuilder RequireApprovedNetworks(this AuthorizationPolicyBuilder builder,
-                                                                     IList<IPNetwork> networks)
+#if NET8_0_OR_GREATER
+    public static AuthorizationPolicyBuilder RequireApprovedNetworks(this AuthorizationPolicyBuilder builder, IList<IPNetwork> networks)
+#else
+    public static AuthorizationPolicyBuilder RequireApprovedNetworks(this AuthorizationPolicyBuilder builder, IList<IPNetwork2> networks)
+#endif
     {
         // if there are no networks just return
         if (!networks.Any()) return builder;
 
         // reduce the networks where possible (referred to as supernetting)
 #if !NET8_0_OR_GREATER
-        networks = IPNetwork.Supernet([.. networks]);
+        networks = IPNetwork2.Supernet([.. networks]);
 #endif
 
         // add the requirement
@@ -41,10 +44,13 @@ public static AuthorizationPolicyBuilder RequireApprovedNetworks(this Authorizat
     /// </summary>
     /// <param name="builder">The instance to add to</param>
     /// <param name="networks">The allowed networks</param>
-    public static AuthorizationPolicyBuilder RequireApprovedNetworks(this AuthorizationPolicyBuilder builder,
-                                                                     params string[] networks)
+    public static AuthorizationPolicyBuilder RequireApprovedNetworks(this AuthorizationPolicyBuilder builder, params string[] networks)
     {
+#if NET8_0_OR_GREATER
         var parsed = networks.Select(a => IPNetwork.Parse(a)).ToList();
+#else
+        var parsed = networks.Select(a => IPNetwork2.Parse(a)).ToList();
+#endif
         return builder.RequireApprovedNetworks(parsed);
     }
 
@@ -55,8 +61,11 @@ public static AuthorizationPolicyBuilder RequireApprovedNetworks(this Authorizat
     /// </summary>
     /// <param name="builder">The instance to add to</param>
     /// <param name="networks">The allowed networks</param>
-    public static AuthorizationPolicyBuilder RequireApprovedNetworks(this AuthorizationPolicyBuilder builder,
-                                                                     params IPNetwork[] networks)
+#if NET8_0_OR_GREATER
+    public static AuthorizationPolicyBuilder RequireApprovedNetworks(this AuthorizationPolicyBuilder builder, params IPNetwork[] networks)
+#else
+    public static AuthorizationPolicyBuilder RequireApprovedNetworks(this AuthorizationPolicyBuilder builder, params IPNetwork2[] networks)
+#endif
     {
         return builder.RequireApprovedNetworks(networks.ToList());
     }
@@ -122,10 +131,13 @@ public static AuthorizationPolicyBuilder RequireAzureIPNetworks(this Authorizati
     /// A list of Fully Qualified Domain Names.
     /// Each of them will be resolved to list of IP addresses using <see cref="Dns.GetHostAddresses(string)"/>
     /// </param>
-    public static AuthorizationPolicyBuilder RequireNetworkFromDns(this AuthorizationPolicyBuilder builder,
-                                                                   params string[] fqdns)
+    public static AuthorizationPolicyBuilder RequireNetworkFromDns(this AuthorizationPolicyBuilder builder, params string[] fqdns)
     {
+#if NET8_0_OR_GREATER
         var networks = new List<IPNetwork>();
+#else
+        var networks = new List<IPNetwork2>();
+#endif
 
         // work on each FQDN
         foreach (var f in fqdns)
@@ -136,7 +148,11 @@ public static AuthorizationPolicyBuilder RequireNetworkFromDns(this Authorizatio
                 var ips = Dns.GetHostAddresses(f);
 
                 // parse the IP addresses into IP networks
+#if NET8_0_OR_GREATER
                 var rawNetworks = ips?.Select(ip => new IPNetwork(ip, (byte)(ip.AddressFamily is AddressFamily.InterNetwork ? 32 : 128)));
+#else
+                var rawNetworks = ips?.Select(ip => new IPNetwork2(ip, (byte)(ip.AddressFamily is AddressFamily.InterNetwork ? 32 : 128)));
+#endif
 
                 // add networks into the list if there are any
                 if (rawNetworks?.Any() ?? false)
diff --git a/src/Tingle.AspNetCore.Authorization/Tingle.AspNetCore.Authorization.csproj b/src/Tingle.AspNetCore.Authorization/Tingle.AspNetCore.Authorization.csproj
index 4796d51..fdd681c 100644
--- a/src/Tingle.AspNetCore.Authorization/Tingle.AspNetCore.Authorization.csproj
+++ b/src/Tingle.AspNetCore.Authorization/Tingle.AspNetCore.Authorization.csproj
@@ -10,7 +10,7 @@
 
   <ItemGroup>
     <FrameworkReference Include="Microsoft.AspNetCore.App" />
-    <PackageReference Include="AzureIPNetworks" Version="1.6.0" />
+    <PackageReference Include="AzureIPNetworks" Version="1.7.0" />
   </ItemGroup>
 
 </Project>