diff --git a/libstratosphere/include/stratosphere/ams/impl/ams_system_thread_definitions.hpp b/libstratosphere/include/stratosphere/ams/impl/ams_system_thread_definitions.hpp
index 06a1e026..ff789a78 100644
--- a/libstratosphere/include/stratosphere/ams/impl/ams_system_thread_definitions.hpp
+++ b/libstratosphere/include/stratosphere/ams/impl/ams_system_thread_definitions.hpp
@@ -113,6 +113,9 @@ namespace ams::impl {
     AMS_DEFINE_SYSTEM_THREAD(21, erpt, Main);
     AMS_DEFINE_SYSTEM_THREAD(21, erpt, IpcServer);
 
+    /* socket. */
+    AMS_DEFINE_SYSTEM_THREAD(29, socket, ResolverIpcServer);
+
     /* jpegdec. */
     AMS_DEFINE_SYSTEM_THREAD(21, jpegdec, Main);
 
diff --git a/libstratosphere/include/stratosphere/socket.hpp b/libstratosphere/include/stratosphere/socket.hpp
new file mode 100644
index 00000000..d43f9238
--- /dev/null
+++ b/libstratosphere/include/stratosphere/socket.hpp
@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+#include <stratosphere/socket/socket_types.hpp>
diff --git a/libstratosphere/include/stratosphere/socket/socket_types.hpp b/libstratosphere/include/stratosphere/socket/socket_types.hpp
new file mode 100644
index 00000000..bac58080
--- /dev/null
+++ b/libstratosphere/include/stratosphere/socket/socket_types.hpp
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+#include <vapours.hpp>
+
+namespace ams::socket {
+
+    using InAddrT  = u32;
+    using InPortT  = u16;
+    using SockLenT = u32;
+    using NfdsT    = u64;
+    using FdMask   = u64;
+
+    constexpr inline unsigned int FdSetSize = 0x400;
+
+    template<u32 A, u32 B, u32 C, u32 D>
+    constexpr inline InAddrT EncodeInAddr = (A << 24) | (B << 16) | (C << 8) | (D << 0);
+
+    constexpr inline InAddrT InAddr_Any       = EncodeInAddr<  0,   0,   0,   0>;
+    constexpr inline InAddrT InAddr_Broadcast = EncodeInAddr<255, 255, 255, 255>;
+    constexpr inline InAddrT InAddr_None      = EncodeInAddr<255, 255, 255, 255>;
+    constexpr inline InAddrT InAddr_Loopback  = EncodeInAddr<127,   0,   0,   1>;
+
+    enum class Family : u8 {
+        Af_Unspec = 0,
+        Pf_Unspec = Af_Unspec,
+
+        Af_Inet   = 2,
+        Pf_Inet   = Af_Inet,
+
+        Af_Route  = 17,
+        Pf_Route  = Af_Route,
+
+        Af_Link   = 18,
+        Pf_Link   = Af_Link,
+
+        Af_Inet6  = 28,
+        Pf_Inet6  = Af_Inet6,
+
+        Af_Max    = 42,
+        Pf_Max    = Af_Max
+    };
+
+    struct HostEnt {
+        char *h_name;
+        char **h_aliases;
+        Family h_addrtype;
+        int h_length;
+        char **h_addr_list;
+    };
+
+}