diff --git a/roles/bird/filter_plugins/bird.py b/roles/bird/filter_plugins/bird.py
index b2764d9..2cf01de 100644
--- a/roles/bird/filter_plugins/bird.py
+++ b/roles/bird/filter_plugins/bird.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 import itertools
 import re
 from dataclasses import dataclass
-from ipaddress import IPv4Address
+from ipaddress import IPv4Address, IPv4Network, IPv6Network, ip_network
 from typing import Any, Generic, Iterator, Literal, TypeVar
 
 from pydantic import (
@@ -89,12 +89,37 @@ class IPv4orIPv6(BaseModel):
     ipv6: list[int] = Field(ge=0, min_items=2, max_items=2)
 
 
+class IPFlag(str):
+    @classmethod
+    def __get_validators__(cls):
+        yield cls.validate
+
+    @classmethod
+    def validate(cls, v):
+        pattern = r"(?P<ip>.*?)(?P<flag>[+-]|\{[0-9]+,[0-9]+\})?$"
+        parts = re.match(pattern, v)
+
+        return (ip_network(parts.group("ip")), parts.group("flag"))
+
+
+class NetMatch(BaseModel):
+    matches: list[IPFlag] = Field(alias="net.match")
+
+
 class NetLength(BaseModel):
     length: IPv4orIPv6 = Field(alias="net.len")
 
 
 Condition = (
-    Proto | Source | And | Or | Not | AsPathContains | AsPathLength | NetLength
+    Proto
+    | Source
+    | And
+    | Or
+    | Not
+    | AsPathContains
+    | AsPathLength
+    | NetLength
+    | NetMatch
 )
 
 And.update_forward_refs()
@@ -210,6 +235,18 @@ def str_of_condition(condition: Condition, ctx: bool) -> str:
             else:
                 return f"{min_v6} <= net.len && net.len <= {max_v6}"
 
+        case NetMatch(matches=matches):
+            if ctx.ipv4:
+                networks = [
+                    m for m in matches if isinstance(m[0], IPv4Network)
+                ]
+            else:
+                networks = [
+                    m for m in matches if isinstance(m[0], IPv6Network)
+                ]
+
+            return f"net ~ [ {', '.join([f'{network}{str(flag)}' for (network, flag) in networks])} ]"
+
 
 def lines_of_action(action: Action, ctx: Context) -> Iterable[str]:
     match action: