diff --git a/impacket/dcerpc/v5/drsuapi.py b/impacket/dcerpc/v5/drsuapi.py
index 56280051b..8a2b9085b 100644
--- a/impacket/dcerpc/v5/drsuapi.py
+++ b/impacket/dcerpc/v5/drsuapi.py
@@ -33,7 +33,7 @@
 from impacket import LOG
 from impacket.dcerpc.v5.ndr import NDRCALL, NDRSTRUCT, NDRPOINTER, NDRUniConformantArray, NDRUNION, NDR, NDRENUM
 from impacket.dcerpc.v5.dtypes import PUUID, DWORD, NULL, GUID, LPWSTR, BOOL, ULONG, UUID, LONGLONG, ULARGE_INTEGER, \
-    LARGE_INTEGER
+    LARGE_INTEGER, PCHAR, UCHAR, ULONGLONG
 from impacket import hresult_errors, system_errors
 from impacket.structure import Structure
 from impacket.uuid import uuidtup_to_bin, string_to_bin
@@ -687,6 +687,29 @@ class PDRS_SecBufferDesc(NDRPOINTER):
     )
 
 
+# 5.165 REPLTIMES
+class REPLTIMES(NDRSTRUCT):
+    structure = (
+        ('rgTimes', UCHAR),
+    )
+
+
+# 5.219 VAR_SIZE_BUFFER_WITH_VERSION
+class VAR_SIZE_BUFFER_WITH_VERSION(NDRSTRUCT):
+    structure = (
+        ('ulVersion', ULONG),
+        ('cbByteBuffer', ULONG),
+        ('ullPadding', ULONGLONG),
+        ('rgbBuffer', BYTE_ARRAY),
+    )
+
+
+class PVAR_SIZE_BUFFER_WITH_VERSION(NDRPOINTER):
+    referent = (
+        ('Data', VAR_SIZE_BUFFER_WITH_VERSION)
+    )
+
+
 # 5.50 DSNAME
 class WCHAR_ARRAY(NDRUniConformantArray):
     item = 'H'
@@ -707,6 +730,8 @@ def __getitem__(self, key):
             return NDR.__getitem__(self, key)
 
 
+
+
 class DSNAME(NDRSTRUCT):
     structure = (
         ('structLen', ULONG),
@@ -1409,6 +1434,61 @@ class DRS_MSG_ADDENTRYREQ(NDRUNION):
         3: ('V3', DRS_MSG_ADDENTRYREQ_V3),
     }
 
+
+# 4.1.19.1.2 DRS_MSG_REPADD_V1
+class DRS_MSG_REPADD_V1(NDRSTRUCT):
+    structure = (
+        ('pNC', PDSNAME),
+        ('pszDsaSrc', PCHAR),  # don't know if it's supposed to be PCHAR or LPSTR
+        ('rtSchedule', REPLTIMES),
+        ('ulOptions', ULONG),
+    )
+
+
+# 4.1.19.1.2 DRS_MSG_REPADD_V2
+class DRS_MSG_REPADD_V2(NDRSTRUCT):
+    structure = (
+        ('pNC', PDSNAME),
+        ('pSourceDsaDN', PDSNAME),
+        ('pTransportDN', PDSNAME),
+        ('pszSourceDsaAddress', PCHAR),
+        ('rtSchedule', REPLTIMES),
+        ('ulOptions', ULONG),
+    )
+
+
+# 4.1.19.1.2 DRS_MSG_REPADD_V3
+class DRS_MSG_REPADD_V3(NDRSTRUCT):
+    structure = (
+        ('pNC', PDSNAME),
+        ('pSourceDsaDN', PDSNAME),
+        ('pTransportDN', PDSNAME),
+        ('pszSourceDsaAddress', PCHAR),
+        ('rtSchedule', REPLTIMES),
+        ('ulOptions', ULONG),
+        ('correlationID', GUID),
+        ('pReservedBuffer', PVAR_SIZE_BUFFER_WITH_VERSION),
+    )
+
+
+# 4.1.19.1.1 DRS_MSG_REPADD
+class DRS_MSG_REPADD(NDRUNION):
+    commonHdr = (
+        ('tag', DWORD),
+    )
+    union = {
+        1: ('V1', DRS_MSG_ADDENTRYREQ_V1),
+        2: ('V2', DRS_MSG_ADDENTRYREQ_V2),
+        3: ('V3', DRS_MSG_ADDENTRYREQ_V3),
+    }
+
+
+class PDRS_MSG_REPADD(NDRPOINTER):
+    referent = (
+        ('Data', DRS_MSG_REPADD),
+    )
+
+
 ################################################################################
 # RPC CALLS
 ################################################################################
@@ -1553,6 +1633,15 @@ class DRSAddEntryResponse(NDRCALL):
 # TODO : this is a dummy structure that needs fixing
 
 
+# 4.1.19 IDL_DRSReplicaAdd (Opnum 5)
+class DRSReplicaAdd(NDRCALL):
+    structure = (
+        ('hDrs', DRS_HANDLE),
+        ('dwVersion', DWORD),
+        ('pmsgAdd', PDRS_MSG_REPADD),
+    )
+
+
 ################################################################################
 # OPNUMs and their corresponding structures
 ################################################################################
@@ -1634,6 +1723,13 @@ def hDRSAddEntry(dce, hDrs, dwInVersion, pmsgIn):
     return dce.request(request)
 
 
+def hDRSReplicaAdd(dce, hDrs, dwVersion, pmsgAdd):
+    request = DRSReplicaAdd()
+    request['hDrs'] = hDrs
+    request['dwVersion'] = dwVersion
+    request['pmsgAdd'] = dwVersion
+
+
 def deriveKey(baseKey):
     # 2.2.11.1.3 Deriving Key1 and Key2 from a Little-Endian, Unsigned Integer Key
     # Let I be the little-endian, unsigned integer.