diff --git a/ipn/ipnlocal/local.go b/ipn/ipnlocal/local.go
index bdaef23a2..706ca524b 100644
--- a/ipn/ipnlocal/local.go
+++ b/ipn/ipnlocal/local.go
@@ -5808,7 +5808,7 @@ func (b *LocalBackend) AdvertiseRoute(ipps ...netip.Prefix) error {
 		}
 
 		// If the new prefix is already contained by existing routes, skip it.
-		if coveredRouteRange(finalRoutes, ipp) {
+		if coveredRouteRangeNoDefault(finalRoutes, ipp) {
 			continue
 		}
 
@@ -5829,10 +5829,13 @@ func (b *LocalBackend) AdvertiseRoute(ipps ...netip.Prefix) error {
 	return err
 }
 
-// coveredRouteRange checks if a route is already included in a slice of
-// prefixes.
-func coveredRouteRange(finalRoutes []netip.Prefix, ipp netip.Prefix) bool {
+// coveredRouteRangeNoDefault checks if a route is already included in a slice of
+// prefixes, ignoring default routes in the range.
+func coveredRouteRangeNoDefault(finalRoutes []netip.Prefix, ipp netip.Prefix) bool {
 	for _, r := range finalRoutes {
+		if r == tsaddr.AllIPv4() || r == tsaddr.AllIPv6() {
+			continue
+		}
 		if ipp.IsSingleIP() {
 			if r.Contains(ipp.Addr()) {
 				return true
diff --git a/ipn/ipnlocal/local_test.go b/ipn/ipnlocal/local_test.go
index 9ff967b2e..8c8b68a87 100644
--- a/ipn/ipnlocal/local_test.go
+++ b/ipn/ipnlocal/local_test.go
@@ -1218,7 +1218,7 @@ func TestObserveDNSResponse(t *testing.T) {
 	}
 }
 
-func TestCoveredRouteRange(t *testing.T) {
+func TestCoveredRouteRangeNoDefault(t *testing.T) {
 	tests := []struct {
 		existingRoute netip.Prefix
 		newRoute      netip.Prefix
@@ -1244,10 +1244,20 @@ func TestCoveredRouteRange(t *testing.T) {
 			newRoute:      netip.MustParsePrefix("192.0.0.0/24"),
 			want:          true,
 		},
+		{
+			existingRoute: netip.MustParsePrefix("0.0.0.0/0"),
+			newRoute:      netip.MustParsePrefix("192.0.0.0/24"),
+			want:          false,
+		},
+		{
+			existingRoute: netip.MustParsePrefix("::/0"),
+			newRoute:      netip.MustParsePrefix("2001:db8::/32"),
+			want:          false,
+		},
 	}
 
 	for _, tt := range tests {
-		got := coveredRouteRange([]netip.Prefix{tt.existingRoute}, tt.newRoute)
+		got := coveredRouteRangeNoDefault([]netip.Prefix{tt.existingRoute}, tt.newRoute)
 		if got != tt.want {
 			t.Errorf("coveredRouteRange(%v, %v) = %v, want %v", tt.existingRoute, tt.newRoute, got, tt.want)
 		}