diff --git a/src/libraries/System.Net.Sockets/ref/System.Net.Sockets.cs b/src/libraries/System.Net.Sockets/ref/System.Net.Sockets.cs
index 2da5179682d37..cf9c4361e34b5 100644
--- a/src/libraries/System.Net.Sockets/ref/System.Net.Sockets.cs
+++ b/src/libraries/System.Net.Sockets/ref/System.Net.Sockets.cs
@@ -78,10 +78,10 @@ public partial struct IPPacketInformation
     {
         private object _dummy;
         private int _dummyPrimitive;
-        public System.Net.IPAddress Address { get { throw null; } }
-        public int Interface { get { throw null; } }
-        public override bool Equals([System.Diagnostics.CodeAnalysis.NotNullWhen(true)] object? comparand) { throw null; }
-        public override int GetHashCode() { throw null; }
+        public readonly System.Net.IPAddress Address { get { throw null; } }
+        public readonly int Interface { get { throw null; } }
+        public override readonly bool Equals([System.Diagnostics.CodeAnalysis.NotNullWhen(true)] object? comparand) { throw null; }
+        public override readonly int GetHashCode() { throw null; }
         public static bool operator ==(System.Net.Sockets.IPPacketInformation packetInformation1, System.Net.Sockets.IPPacketInformation packetInformation2) { throw null; }
         public static bool operator !=(System.Net.Sockets.IPPacketInformation packetInformation1, System.Net.Sockets.IPPacketInformation packetInformation2) { throw null; }
     }
@@ -489,8 +489,8 @@ public partial struct SocketInformation
     {
         private object _dummy;
         private int _dummyPrimitive;
-        public System.Net.Sockets.SocketInformationOptions Options { readonly get { throw null; } set { } }
-        public byte[] ProtocolInformation { readonly get { throw null; } set { } }
+        public System.Net.Sockets.SocketInformationOptions Options { get { throw null; } set { } }
+        public byte[] ProtocolInformation { get { throw null; } set { } }
     }
     [System.FlagsAttribute]
     public enum SocketInformationOptions
@@ -757,11 +757,11 @@ public partial struct UdpReceiveResult : System.IEquatable<System.Net.Sockets.Ud
         private object _dummy;
         private int _dummyPrimitive;
         public UdpReceiveResult(byte[] buffer, System.Net.IPEndPoint remoteEndPoint) { throw null; }
-        public byte[] Buffer { get { throw null; } }
-        public System.Net.IPEndPoint RemoteEndPoint { get { throw null; } }
-        public bool Equals(System.Net.Sockets.UdpReceiveResult other) { throw null; }
-        public override bool Equals([System.Diagnostics.CodeAnalysis.NotNullWhen(true)] object? obj) { throw null; }
-        public override int GetHashCode() { throw null; }
+        public readonly byte[] Buffer { get { throw null; } }
+        public readonly System.Net.IPEndPoint RemoteEndPoint { get { throw null; } }
+        public readonly bool Equals(System.Net.Sockets.UdpReceiveResult other) { throw null; }
+        public override readonly bool Equals([System.Diagnostics.CodeAnalysis.NotNullWhen(true)] object? obj) { throw null; }
+        public override readonly int GetHashCode() { throw null; }
         public static bool operator ==(System.Net.Sockets.UdpReceiveResult left, System.Net.Sockets.UdpReceiveResult right) { throw null; }
         public static bool operator !=(System.Net.Sockets.UdpReceiveResult left, System.Net.Sockets.UdpReceiveResult right) { throw null; }
     }
diff --git a/src/libraries/System.Net.Sockets/src/System/Net/Sockets/IPPacketInformation.cs b/src/libraries/System.Net.Sockets/src/System/Net/Sockets/IPPacketInformation.cs
index 06d4eca31750b..8f34a59685212 100644
--- a/src/libraries/System.Net.Sockets/src/System/Net/Sockets/IPPacketInformation.cs
+++ b/src/libraries/System.Net.Sockets/src/System/Net/Sockets/IPPacketInformation.cs
@@ -16,7 +16,7 @@ internal IPPacketInformation(IPAddress address, int networkInterface)
             _networkInterface = networkInterface;
         }
 
-        public IPAddress Address
+        public readonly IPAddress Address
         {
             get
             {
@@ -24,7 +24,7 @@ public IPAddress Address
             }
         }
 
-        public int Interface
+        public readonly int Interface
         {
             get
             {
@@ -44,10 +44,10 @@ public int Interface
             return !(packetInformation1 == packetInformation2);
         }
 
-        public override bool Equals([NotNullWhen(true)] object? comparand) =>
+        public override readonly bool Equals([NotNullWhen(true)] object? comparand) =>
             comparand is IPPacketInformation other && this == other;
 
-        public override int GetHashCode()
+        public override readonly int GetHashCode()
         {
             return unchecked(_networkInterface.GetHashCode() * (int)0xA5555529) +
                 (_address == null ? 0 : _address.GetHashCode());
diff --git a/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncContext.Unix.cs b/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncContext.Unix.cs
index 7e4baeda1985d..983a85248851f 100644
--- a/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncContext.Unix.cs
+++ b/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncContext.Unix.cs
@@ -742,9 +742,9 @@ private enum QueueState : int
             // never around any external call, e.g. OS call or user code invocation.
             private object _queueLock;
 
-            private LockToken Lock() => new LockToken(_queueLock);
+            private readonly LockToken Lock() => new LockToken(_queueLock);
 
-            public bool IsNextOperationSynchronous_Speculative => _isNextOperationSynchronous;
+            public readonly bool IsNextOperationSynchronous_Speculative => _isNextOperationSynchronous;
 
             public void Init()
             {
@@ -1216,7 +1216,7 @@ public bool StopAndAbort(SocketAsyncContext context)
             }
 
             [Conditional("SOCKETASYNCCONTEXT_TRACE")]
-            public void Trace(SocketAsyncContext context, string message, [CallerMemberName] string? memberName = null)
+            public readonly void Trace(SocketAsyncContext context, string message, [CallerMemberName] string? memberName = null)
             {
                 string queueType =
                     typeof(TOperation) == typeof(ReadOperation) ? "recv" :
diff --git a/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketInformation.cs b/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketInformation.cs
index e6cfa4ffcd72e..4a75ce7a31dc8 100644
--- a/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketInformation.cs
+++ b/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketInformation.cs
@@ -14,7 +14,7 @@ internal void SetOption(SocketInformationOptions option, bool value)
             else Options &= ~option;
         }
 
-        internal bool GetOption(SocketInformationOptions option)
+        internal readonly bool GetOption(SocketInformationOptions option)
         {
             return (Options & option) == option;
         }
diff --git a/src/libraries/System.Net.Sockets/src/System/Net/Sockets/UdpReceiveResult.cs b/src/libraries/System.Net.Sockets/src/System/Net/Sockets/UdpReceiveResult.cs
index 25af4a45bbaa1..fd025c67acf4b 100644
--- a/src/libraries/System.Net.Sockets/src/System/Net/Sockets/UdpReceiveResult.cs
+++ b/src/libraries/System.Net.Sockets/src/System/Net/Sockets/UdpReceiveResult.cs
@@ -37,7 +37,7 @@ public UdpReceiveResult(byte[] buffer, IPEndPoint remoteEndPoint)
         /// <summary>
         /// Gets a buffer with the data received in the UDP packet
         /// </summary>
-        public byte[] Buffer
+        public readonly byte[] Buffer
         {
             get
             {
@@ -48,7 +48,7 @@ public byte[] Buffer
         /// <summary>
         /// Gets the remote endpoint from which the UDP packet was received
         /// </summary>
-        public IPEndPoint RemoteEndPoint
+        public readonly IPEndPoint RemoteEndPoint
         {
             get
             {
@@ -60,7 +60,7 @@ public IPEndPoint RemoteEndPoint
         /// Returns the hash code for this instance.
         /// </summary>
         /// <returns>The hash code</returns>
-        public override int GetHashCode()
+        public override readonly int GetHashCode()
         {
             return (_buffer != null) ? (_buffer.GetHashCode() ^ _remoteEndPoint.GetHashCode()) : 0;
         }
@@ -70,7 +70,7 @@ public override int GetHashCode()
         /// </summary>
         /// <param name="obj">The object to compare with this instance</param>
         /// <returns>true if obj is an instance of <see cref="UdpReceiveResult"/> and equals the value of the instance; otherwise, false</returns>
-        public override bool Equals([NotNullWhen(true)] object? obj) =>
+        public override readonly bool Equals([NotNullWhen(true)] object? obj) =>
             obj is UdpReceiveResult other && Equals(other);
 
         /// <summary>
@@ -78,7 +78,7 @@ public override bool Equals([NotNullWhen(true)] object? obj) =>
         /// </summary>
         /// <param name="other">The object to compare with this instance</param>
         /// <returns>true if other is an instance of <see cref="UdpReceiveResult"/> and equals the value of the instance; otherwise, false</returns>
-        public bool Equals(UdpReceiveResult other)
+        public readonly bool Equals(UdpReceiveResult other)
         {
             return object.Equals(_buffer, other._buffer) && object.Equals(_remoteEndPoint, other._remoteEndPoint);
         }