diff --git a/docs/source/api/zmq.rst b/docs/source/api/zmq.rst
index 2d3c9156b..9252cb27e 100644
--- a/docs/source/api/zmq.rst
+++ b/docs/source/api/zmq.rst
@@ -119,6 +119,10 @@ as well as via enums (``zmq.SocketType.PUSH``, etc.).
 
 .. autoenum:: Event
 
+.. autoenum:: NormMode
+
+.. autoenum:: RouterNotify
+
 .. autoenum:: SecurityMechanism
 
 .. autoenum:: DeviceType
diff --git a/zmq/backend/cython/constant_enums.pxi b/zmq/backend/cython/constant_enums.pxi
index f6ed04277..811d2a84f 100644
--- a/zmq/backend/cython/constant_enums.pxi
+++ b/zmq/backend/cython/constant_enums.pxi
@@ -88,6 +88,11 @@ cdef extern from "zmq.h" nogil:
     enum: ZMQ_MORE
     enum: ZMQ_SHARED
     enum: ZMQ_SRCFD
+    enum: ZMQ_NORM_FIXED
+    enum: ZMQ_NORM_CC
+    enum: ZMQ_NORM_CCL
+    enum: ZMQ_NORM_CCE
+    enum: ZMQ_NORM_CCE_ECNONLY
     enum: ZMQ_POLLIN
     enum: ZMQ_POLLOUT
     enum: ZMQ_POLLERR
@@ -95,6 +100,8 @@ cdef extern from "zmq.h" nogil:
     enum: ZMQ_RECONNECT_STOP_CONN_REFUSED
     enum: ZMQ_RECONNECT_STOP_HANDSHAKE_FAILED
     enum: ZMQ_RECONNECT_STOP_AFTER_DISCONNECT
+    enum: ZMQ_NOTIFY_CONNECT
+    enum: ZMQ_NOTIFY_DISCONNECT
     enum: ZMQ_NULL
     enum: ZMQ_PLAIN
     enum: ZMQ_CURVE
@@ -206,6 +213,18 @@ cdef extern from "zmq.h" nogil:
     enum: ZMQ_HELLO_MSG
     enum: ZMQ_DISCONNECT_MSG
     enum: ZMQ_PRIORITY
+    enum: ZMQ_BUSY_POLL
+    enum: ZMQ_HICCUP_MSG
+    enum: ZMQ_XSUB_VERBOSE_UNSUBSCRIBE
+    enum: ZMQ_TOPICS_COUNT
+    enum: ZMQ_NORM_MODE
+    enum: ZMQ_NORM_UNICAST_NACK
+    enum: ZMQ_NORM_BUFFER_SIZE
+    enum: ZMQ_NORM_SEGMENT_SIZE
+    enum: ZMQ_NORM_BLOCK_SIZE
+    enum: ZMQ_NORM_NUM_PARITY
+    enum: ZMQ_NORM_NUM_AUTOPARITY
+    enum: ZMQ_NORM_PUSH
     enum: ZMQ_PAIR
     enum: ZMQ_PUB
     enum: ZMQ_SUB
diff --git a/zmq/constants.py b/zmq/constants.py
index 64684b86e..d9859871d 100644
--- a/zmq/constants.py
+++ b/zmq/constants.py
@@ -257,6 +257,19 @@ def __new__(cls, value: int, opt_type: _OptType = _OptType.int):
     HELLO_MSG = 110, _OptType.bytes
     DISCONNECT_MSG = 111, _OptType.bytes
     PRIORITY = 112
+    # 4.3.5
+    BUSY_POLL = 113
+    HICCUP_MSG = 114, _OptType.bytes
+    XSUB_VERBOSE_UNSUBSCRIBE = 115
+    TOPICS_COUNT = 116
+    NORM_MODE = 117
+    NORM_UNICAST_NACK = 118
+    NORM_BUFFER_SIZE = 119
+    NORM_SEGMENT_SIZE = 120
+    NORM_BLOCK_SIZE = 121
+    NORM_NUM_PARITY = 122
+    NORM_NUM_AUTOPARITY = 123
+    NORM_PUSH = 124
 
 
 class MessageOption(IntEnum):
@@ -282,6 +295,39 @@ class Flag(IntFlag):
     NOBLOCK = DONTWAIT
 
 
+class RouterNotify(IntEnum):
+    """Values for zmq.ROUTER_NOTIFY socket option
+
+    .. versionadded:: 26
+    .. versionadded:: libzmq-4.3.0 (draft)
+    """
+
+    @staticmethod
+    def _global_name(name):
+        return f"NOTIFY_{name}"
+
+    CONNECT = 1
+    DISCONNECT = 2
+
+
+class NormMode(IntEnum):
+    """Values for zmq.NORM_MODE socket option
+
+    .. versionadded:: 26
+    .. versionadded:: libzmq-4.3.5 (draft)
+    """
+
+    @staticmethod
+    def _global_name(name):
+        return f"NORM_{name}"
+
+    FIXED = 0
+    CC = 1
+    CCL = 2
+    CCE = 3
+    CCE_ECNONLY = 4
+
+
 class SecurityMechanism(IntEnum):
     """Security mechanisms (as returned by ``socket.get(zmq.MECHANISM)``)
 
@@ -502,6 +548,11 @@ class DeviceType(IntEnum):
 MORE: int = MessageOption.MORE
 SHARED: int = MessageOption.SHARED
 SRCFD: int = MessageOption.SRCFD
+NORM_FIXED: int = NormMode.FIXED
+NORM_CC: int = NormMode.CC
+NORM_CCL: int = NormMode.CCL
+NORM_CCE: int = NormMode.CCE
+NORM_CCE_ECNONLY: int = NormMode.CCE_ECNONLY
 POLLIN: int = PollEvent.POLLIN
 POLLOUT: int = PollEvent.POLLOUT
 POLLERR: int = PollEvent.POLLERR
@@ -509,6 +560,8 @@ class DeviceType(IntEnum):
 RECONNECT_STOP_CONN_REFUSED: int = ReconnectStop.CONN_REFUSED
 RECONNECT_STOP_HANDSHAKE_FAILED: int = ReconnectStop.HANDSHAKE_FAILED
 RECONNECT_STOP_AFTER_DISCONNECT: int = ReconnectStop.AFTER_DISCONNECT
+NOTIFY_CONNECT: int = RouterNotify.CONNECT
+NOTIFY_DISCONNECT: int = RouterNotify.DISCONNECT
 NULL: int = SecurityMechanism.NULL
 PLAIN: int = SecurityMechanism.PLAIN
 CURVE: int = SecurityMechanism.CURVE
@@ -620,6 +673,18 @@ class DeviceType(IntEnum):
 HELLO_MSG: int = SocketOption.HELLO_MSG
 DISCONNECT_MSG: int = SocketOption.DISCONNECT_MSG
 PRIORITY: int = SocketOption.PRIORITY
+BUSY_POLL: int = SocketOption.BUSY_POLL
+HICCUP_MSG: int = SocketOption.HICCUP_MSG
+XSUB_VERBOSE_UNSUBSCRIBE: int = SocketOption.XSUB_VERBOSE_UNSUBSCRIBE
+TOPICS_COUNT: int = SocketOption.TOPICS_COUNT
+NORM_MODE: int = SocketOption.NORM_MODE
+NORM_UNICAST_NACK: int = SocketOption.NORM_UNICAST_NACK
+NORM_BUFFER_SIZE: int = SocketOption.NORM_BUFFER_SIZE
+NORM_SEGMENT_SIZE: int = SocketOption.NORM_SEGMENT_SIZE
+NORM_BLOCK_SIZE: int = SocketOption.NORM_BLOCK_SIZE
+NORM_NUM_PARITY: int = SocketOption.NORM_NUM_PARITY
+NORM_NUM_AUTOPARITY: int = SocketOption.NORM_NUM_AUTOPARITY
+NORM_PUSH: int = SocketOption.NORM_PUSH
 PAIR: int = SocketType.PAIR
 PUB: int = SocketType.PUB
 SUB: int = SocketType.SUB
@@ -738,6 +803,12 @@ class DeviceType(IntEnum):
     "MORE",
     "SHARED",
     "SRCFD",
+    "NormMode",
+    "NORM_FIXED",
+    "NORM_CC",
+    "NORM_CCL",
+    "NORM_CCE",
+    "NORM_CCE_ECNONLY",
     "PollEvent",
     "POLLIN",
     "POLLOUT",
@@ -747,6 +818,9 @@ class DeviceType(IntEnum):
     "RECONNECT_STOP_CONN_REFUSED",
     "RECONNECT_STOP_HANDSHAKE_FAILED",
     "RECONNECT_STOP_AFTER_DISCONNECT",
+    "RouterNotify",
+    "NOTIFY_CONNECT",
+    "NOTIFY_DISCONNECT",
     "SecurityMechanism",
     "NULL",
     "PLAIN",
@@ -860,6 +934,18 @@ class DeviceType(IntEnum):
     "HELLO_MSG",
     "DISCONNECT_MSG",
     "PRIORITY",
+    "BUSY_POLL",
+    "HICCUP_MSG",
+    "XSUB_VERBOSE_UNSUBSCRIBE",
+    "TOPICS_COUNT",
+    "NORM_MODE",
+    "NORM_UNICAST_NACK",
+    "NORM_BUFFER_SIZE",
+    "NORM_SEGMENT_SIZE",
+    "NORM_BLOCK_SIZE",
+    "NORM_NUM_PARITY",
+    "NORM_NUM_AUTOPARITY",
+    "NORM_PUSH",
     "SocketType",
     "PAIR",
     "PUB",
diff --git a/zmq/tests/test_socket.py b/zmq/tests/test_socket.py
index bb052611b..c305ec6d3 100644
--- a/zmq/tests/test_socket.py
+++ b/zmq/tests/test_socket.py
@@ -245,6 +245,11 @@ def test_int_sockopts(self):
                     'ONLY_FIRST_SUBSCRIBE',
                     'PRIORITY',
                     'RECONNECT_STOP',
+                    'NORM_',
+                    'ROUTER_',
+                    'BUSY_POLL',
+                    'XSUB_VERBOSE_',
+                    'TOPICS_',
                 )
             ):
                 # some sockopts are write-only