diff --git a/flow/record/fieldtypes/net/__init__.py b/flow/record/fieldtypes/net/__init__.py
index 524ca23..5c46c05 100644
--- a/flow/record/fieldtypes/net/__init__.py
+++ b/flow/record/fieldtypes/net/__init__.py
@@ -3,7 +3,6 @@
 from flow.record.fieldtypes import string
 from flow.record.fieldtypes.net.ip import (
     IPAddress,
-    IPInterface,
     IPNetwork,
     ipaddress,
     ipinterface,
@@ -12,7 +11,6 @@
 
 __all__ = [
     "IPAddress",
-    "IPInterface",
     "IPNetwork",
     "ipaddress",
     "ipinterface",
diff --git a/flow/record/fieldtypes/net/ip.py b/flow/record/fieldtypes/net/ip.py
index 20e05e2..a202550 100644
--- a/flow/record/fieldtypes/net/ip.py
+++ b/flow/record/fieldtypes/net/ip.py
@@ -19,16 +19,18 @@
 _IPNetwork = Union[IPv4Network, IPv6Network]
 _IPAddress = Union[IPv4Address, IPv6Address]
 _IPInterface = Union[IPv4Interface, IPv6Interface]
+_ConversionTypes = Union[str, int, bytes]
+_IP = Union[_IPNetwork, _IPAddress, _IPInterface]
 
 
 class ipaddress(FieldType):
-    val = None
+    val: _IPAddress = None
     _type = "net.ipaddress"
 
-    def __init__(self, addr: str | int | bytes):
+    def __init__(self, addr: _ConversionTypes | _IPAddress):
         self.val = ip_address(addr)
 
-    def __eq__(self, b: str | int | bytes | _IPAddress) -> bool:
+    def __eq__(self, b: _ConversionTypes | _IPAddress) -> bool:
         try:
             return self.val == ip_address(b)
         except ValueError:
@@ -57,13 +59,13 @@ def _unpack(data: int) -> ipaddress:
 
 
 class ipnetwork(FieldType):
-    val = None
+    val: _IPNetwork = None
     _type = "net.ipnetwork"
 
-    def __init__(self, addr: str | int | bytes):
+    def __init__(self, addr: _ConversionTypes | _IPNetwork):
         self.val = ip_network(addr)
 
-    def __eq__(self, b: str | int | bytes | _IPNetwork) -> bool:
+    def __eq__(self, b: _ConversionTypes | _IPNetwork) -> bool:
         try:
             return self.val == ip_network(b)
         except ValueError:
@@ -108,13 +110,13 @@ def netmask(self) -> ipaddress:
 
 
 class ipinterface(FieldType):
-    val = None
+    val: _IPInterface = None
     _type = "net.ipinterface"
 
-    def __init__(self, addr: int) -> None:
+    def __init__(self, addr: _ConversionTypes | _IP) -> None:
         self.val = ip_interface(addr)
 
-    def __eq__(self, b: str | int | bytes | _IPInterface) -> bool:
+    def __eq__(self, b: _ConversionTypes | _IP) -> bool:
         try:
             return self.val == ip_interface(b)
         except ValueError:
@@ -138,8 +140,8 @@ def network(self) -> ipnetwork:
         return ipnetwork(self.val.network)
 
     @property
-    def netmask(self) -> ipnetwork:
-        return self.network.netmask
+    def netmask(self) -> ipaddress:
+        return ipaddress(self.val.netmask)
 
     def _pack(self) -> str:
         return self.val.compressed
@@ -151,7 +153,5 @@ def _unpack(data: str) -> ipinterface:
 
 # alias: net.IPAddress -> net.ipaddress
 # alias: net.IPNetwork -> net.ipnetwork
-# alias: net.IPInterface -> net.ipinterface
 IPAddress = ipaddress
 IPNetwork = ipnetwork
-IPInterface = ipinterface
diff --git a/tests/test_fieldtype_ip.py b/tests/test_fieldtype_ip.py
index d39c62e..a1c224e 100644
--- a/tests/test_fieldtype_ip.py
+++ b/tests/test_fieldtype_ip.py
@@ -162,6 +162,17 @@ def test_record_ipinterface() -> None:
     assert r.interface == "::1"
     assert r.interface == "::1/128"
 
+    r = TestRecord("64:ff9b::2/96")
+    assert r.interface == "64:ff9b::2/96"
+    assert r.interface.ip == "64:ff9b::2"
+    assert r.interface.network == "64:ff9b::/96"
+    assert r.interface.netmask == "ffff:ffff:ffff:ffff:ffff:ffff::"
+
+    # instantiate from different types
+    assert TestRecord(1).interface == "0.0.0.1/32"
+    assert TestRecord(0x7F0000FF).interface == "127.0.0.255/32"
+    assert TestRecord(b"\x7f\xff\xff\xff").interface == "127.255.255.255/32"
+
     # Test whether it functions in a set
     data = {TestRecord(x).interface for x in ["192.168.0.0/24", "192.168.0.0/24", "::1", "::1"]}
     assert len(data) == 2
@@ -170,6 +181,32 @@ def test_record_ipinterface() -> None:
     assert "::1" not in data
 
 
+def test_record_ipinterface_types() -> None:
+    TestRecord = RecordDescriptor(
+        "test/ipinterface",
+        [
+            (
+                "net.ipinterface",
+                "interface",
+            )
+        ],
+    )
+
+    r = TestRecord("192.168.0.255/24")
+    _if = r.interface
+    assert isinstance(_if, net.ipinterface)
+    assert isinstance(_if.ip, net.ipaddress)
+    assert isinstance(_if.network, net.ipnetwork)
+    assert isinstance(_if.netmask, net.ipaddress)
+
+    r = TestRecord("64:ff9b::/96")
+    _if = r.interface
+    assert isinstance(_if, net.ipinterface)
+    assert isinstance(_if.ip, net.ipaddress)
+    assert isinstance(_if.network, net.ipnetwork)
+    assert isinstance(_if.netmask, net.ipaddress)
+
+
 @pytest.mark.parametrize("PSelector", [Selector, CompiledSelector])
 def test_selector_ipaddress(PSelector: type[Selector]) -> None:
     TestRecord = RecordDescriptor(