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diff --git a/third_party/libwebrtc/rtc_base/ip_address.h b/third_party/libwebrtc/rtc_base/ip_address.h
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+++ b/third_party/libwebrtc/rtc_base/ip_address.h
@@ -0,0 +1,206 @@
+/*
+ *  Copyright 2011 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef RTC_BASE_IP_ADDRESS_H_
+#define RTC_BASE_IP_ADDRESS_H_
+
+#if defined(WEBRTC_POSIX)
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+
+#include "absl/strings/string_view.h"
+#endif
+#if defined(WEBRTC_WIN)
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#endif
+#include <string.h>
+
+#include <string>
+
+#include "rtc_base/byte_order.h"
+#if defined(WEBRTC_WIN)
+#include "rtc_base/win32.h"
+#endif
+#include "absl/strings/string_view.h"
+#include "rtc_base/system/rtc_export.h"
+namespace rtc {
+
+enum IPv6AddressFlag {
+  IPV6_ADDRESS_FLAG_NONE = 0x00,
+
+  // Temporary address is dynamic by nature and will not carry MAC
+  // address.
+  IPV6_ADDRESS_FLAG_TEMPORARY = 1 << 0,
+
+  // Temporary address could become deprecated once the preferred
+  // lifetime is reached. It is still valid but just shouldn't be used
+  // to create new connection.
+  IPV6_ADDRESS_FLAG_DEPRECATED = 1 << 1,
+};
+
+// Version-agnostic IP address class, wraps a union of in_addr and in6_addr.
+class RTC_EXPORT IPAddress {
+ public:
+  IPAddress() : family_(AF_UNSPEC) { ::memset(&u_, 0, sizeof(u_)); }
+
+  explicit IPAddress(const in_addr& ip4) : family_(AF_INET) {
+    memset(&u_, 0, sizeof(u_));
+    u_.ip4 = ip4;
+  }
+
+  explicit IPAddress(const in6_addr& ip6) : family_(AF_INET6) { u_.ip6 = ip6; }
+
+  explicit IPAddress(uint32_t ip_in_host_byte_order) : family_(AF_INET) {
+    memset(&u_, 0, sizeof(u_));
+    u_.ip4.s_addr = HostToNetwork32(ip_in_host_byte_order);
+  }
+
+  IPAddress(const IPAddress& other) : family_(other.family_) {
+    ::memcpy(&u_, &other.u_, sizeof(u_));
+  }
+
+  virtual ~IPAddress() {}
+
+  const IPAddress& operator=(const IPAddress& other) {
+    family_ = other.family_;
+    ::memcpy(&u_, &other.u_, sizeof(u_));
+    return *this;
+  }
+
+  bool operator==(const IPAddress& other) const;
+  bool operator!=(const IPAddress& other) const;
+  bool operator<(const IPAddress& other) const;
+  bool operator>(const IPAddress& other) const;
+
+#ifdef WEBRTC_UNIT_TEST
+  inline std::ostream& operator<<(  // no-presubmit-check TODO(webrtc:8982)
+      std::ostream& os) {           // no-presubmit-check TODO(webrtc:8982)
+    return os << ToString();
+  }
+#endif  // WEBRTC_UNIT_TEST
+
+  int family() const { return family_; }
+  in_addr ipv4_address() const;
+  in6_addr ipv6_address() const;
+
+  // Returns the number of bytes needed to store the raw address.
+  size_t Size() const;
+
+  // Wraps inet_ntop.
+  std::string ToString() const;
+
+  // Same as ToString but anonymizes it by hiding the last part.
+  std::string ToSensitiveString() const;
+
+  // Returns an unmapped address from a possibly-mapped address.
+  // Returns the same address if this isn't a mapped address.
+  IPAddress Normalized() const;
+
+  // Returns this address as an IPv6 address.
+  // Maps v4 addresses (as ::ffff:a.b.c.d), returns v6 addresses unchanged.
+  IPAddress AsIPv6Address() const;
+
+  // For socketaddress' benefit. Returns the IP in host byte order.
+  uint32_t v4AddressAsHostOrderInteger() const;
+
+  // Get the network layer overhead per packet based on the IP address family.
+  int overhead() const;
+
+  // Whether this is an unspecified IP address.
+  bool IsNil() const;
+
+ private:
+  int family_;
+  union {
+    in_addr ip4;
+    in6_addr ip6;
+  } u_;
+};
+
+// IP class which could represent IPv6 address flags which is only
+// meaningful in IPv6 case.
+class RTC_EXPORT InterfaceAddress : public IPAddress {
+ public:
+  InterfaceAddress() : ipv6_flags_(IPV6_ADDRESS_FLAG_NONE) {}
+
+  explicit InterfaceAddress(IPAddress ip)
+      : IPAddress(ip), ipv6_flags_(IPV6_ADDRESS_FLAG_NONE) {}
+
+  InterfaceAddress(IPAddress addr, int ipv6_flags)
+      : IPAddress(addr), ipv6_flags_(ipv6_flags) {}
+
+  InterfaceAddress(const in6_addr& ip6, int ipv6_flags)
+      : IPAddress(ip6), ipv6_flags_(ipv6_flags) {}
+
+  InterfaceAddress(const InterfaceAddress& other) = default;
+  const InterfaceAddress& operator=(const InterfaceAddress& other);
+
+  bool operator==(const InterfaceAddress& other) const;
+  bool operator!=(const InterfaceAddress& other) const;
+
+  int ipv6_flags() const { return ipv6_flags_; }
+
+  std::string ToString() const;
+
+ private:
+  int ipv6_flags_;
+};
+
+bool IPFromAddrInfo(struct addrinfo* info, IPAddress* out);
+RTC_EXPORT bool IPFromString(absl::string_view str, IPAddress* out);
+RTC_EXPORT bool IPFromString(absl::string_view str,
+                             int flags,
+                             InterfaceAddress* out);
+bool IPIsAny(const IPAddress& ip);
+bool IPIsLoopback(const IPAddress& ip);
+bool IPIsLinkLocal(const IPAddress& ip);
+// Identify a private network address like "192.168.111.222"
+// (see https://en.wikipedia.org/wiki/Private_network )
+bool IPIsPrivateNetwork(const IPAddress& ip);
+// Identify a shared network address like "100.72.16.122"
+// (see RFC6598)
+bool IPIsSharedNetwork(const IPAddress& ip);
+// Identify if an IP is "private", that is a loopback
+// or an address belonging to a link-local, a private network or a shared
+// network.
+RTC_EXPORT bool IPIsPrivate(const IPAddress& ip);
+bool IPIsUnspec(const IPAddress& ip);
+size_t HashIP(const IPAddress& ip);
+
+// These are only really applicable for IPv6 addresses.
+bool IPIs6Bone(const IPAddress& ip);
+bool IPIs6To4(const IPAddress& ip);
+RTC_EXPORT bool IPIsMacBased(const IPAddress& ip);
+bool IPIsSiteLocal(const IPAddress& ip);
+bool IPIsTeredo(const IPAddress& ip);
+bool IPIsULA(const IPAddress& ip);
+bool IPIsV4Compatibility(const IPAddress& ip);
+bool IPIsV4Mapped(const IPAddress& ip);
+
+// Returns the precedence value for this IP as given in RFC3484.
+int IPAddressPrecedence(const IPAddress& ip);
+
+// Returns 'ip' truncated to be 'length' bits long.
+RTC_EXPORT IPAddress TruncateIP(const IPAddress& ip, int length);
+
+IPAddress GetLoopbackIP(int family);
+IPAddress GetAnyIP(int family);
+
+// Returns the number of contiguously set bits, counting from the MSB in network
+// byte order, in this IPAddress. Bits after the first 0 encountered are not
+// counted.
+int CountIPMaskBits(const IPAddress& mask);
+
+}  // namespace rtc
+
+#endif  // RTC_BASE_IP_ADDRESS_H_