diff --git a/stdlib/3/ipaddress.pyi b/stdlib/3/ipaddress.pyi
index 6b6a45d1d..daeb8e96f 100644
--- a/stdlib/3/ipaddress.pyi
+++ b/stdlib/3/ipaddress.pyi
@@ -1,6 +1,8 @@
 from typing import (Any, Container, Generic, Iterable, Iterator, Optional,
                     overload, SupportsInt, Text, Tuple, TypeVar)
 
+import sys
+
 # Undocumented length constants
 IPV4LENGTH: int
 IPV6LENGTH: int
@@ -87,6 +89,9 @@ class _BaseNetwork(_IPAddressBase, Container[_A], Iterable[_A], Generic[_A]):
     def overlaps(self: _T, other: _T) -> bool: ...
     @property
     def prefixlen(self) -> int: ...
+    if sys.version_info >= (3, 7):
+        def subnet_of(self: _T, other: _T) -> bool: ...
+        def supernet_of(self: _T, other: _T) -> bool: ...
     def subnets(self: _T, prefixlen_diff: int = ..., new_prefix: Optional[int] = ...) -> Iterator[_T]: ...
     def supernet(self: _T, prefixlen_diff: int = ..., new_prefix: Optional[int] = ...) -> _T: ...
     @property
diff --git a/third_party/2/ipaddress.pyi b/third_party/2/ipaddress.pyi
index 6b6a45d1d..daeb8e96f 100644
--- a/third_party/2/ipaddress.pyi
+++ b/third_party/2/ipaddress.pyi
@@ -1,6 +1,8 @@
 from typing import (Any, Container, Generic, Iterable, Iterator, Optional,
                     overload, SupportsInt, Text, Tuple, TypeVar)
 
+import sys
+
 # Undocumented length constants
 IPV4LENGTH: int
 IPV6LENGTH: int
@@ -87,6 +89,9 @@ class _BaseNetwork(_IPAddressBase, Container[_A], Iterable[_A], Generic[_A]):
     def overlaps(self: _T, other: _T) -> bool: ...
     @property
     def prefixlen(self) -> int: ...
+    if sys.version_info >= (3, 7):
+        def subnet_of(self: _T, other: _T) -> bool: ...
+        def supernet_of(self: _T, other: _T) -> bool: ...
     def subnets(self: _T, prefixlen_diff: int = ..., new_prefix: Optional[int] = ...) -> Iterator[_T]: ...
     def supernet(self: _T, prefixlen_diff: int = ..., new_prefix: Optional[int] = ...) -> _T: ...
     @property