diff --git a/route_info_aix.go b/route_info_aix.go
new file mode 100644
index 00000000..4e23d9d4
--- /dev/null
+++ b/route_info_aix.go
@@ -0,0 +1,35 @@
+//go:build aix
+
+package sockaddr
+
+import (
+	"errors"
+	"os/exec"
+)
+
+var cmds map[string][]string = map[string][]string{
+	"route": {"/usr/sbin/route", "-n", "get", "default"},
+}
+
+// NewRouteInfo returns a BSD-specific implementation of the RouteInfo
+// interface.
+func NewRouteInfo() (routeInfo, error) {
+	return routeInfo{
+		cmds: cmds,
+	}, nil
+}
+
+// GetDefaultInterfaceName returns the interface name attached to the default
+// route on the default interface.
+func (ri routeInfo) GetDefaultInterfaceName() (string, error) {
+	out, err := exec.Command(cmds["route"][0], cmds["route"][1:]...).Output()
+	if err != nil {
+		return "", err
+	}
+
+	var ifName string
+	if ifName, err = parseDefaultIfNameFromRoute(string(out)); err != nil {
+		return "", errors.New("No default interface found")
+	}
+	return ifName, nil
+}
diff --git a/route_info_android.go b/route_info_android.go
index 9885915a..059ddaeb 100644
--- a/route_info_android.go
+++ b/route_info_android.go
@@ -1,3 +1,5 @@
+//go:build android
+
 package sockaddr
 
 import (
@@ -5,10 +7,6 @@ import (
 	"os/exec"
 )
 
-type routeInfo struct {
-	cmds map[string][]string
-}
-
 // NewRouteInfo returns a Android-specific implementation of the RouteInfo
 // interface.
 func NewRouteInfo() (routeInfo, error) {
diff --git a/route_info_default.go b/route_info_default.go
index 6df864ba..db0052fa 100644
--- a/route_info_default.go
+++ b/route_info_default.go
@@ -1,5 +1,5 @@
-//go:build android || nacl || plan9 || js
-// +build android nacl plan9 js
+//go:build nacl || plan9 || js
+// +build nacl plan9 js
 
 package sockaddr
 
diff --git a/route_info_solaris.go b/route_info_solaris.go
index 5843d58c..1354a73b 100644
--- a/route_info_solaris.go
+++ b/route_info_solaris.go
@@ -1,3 +1,5 @@
+//go:build solaris
+
 package sockaddr
 
 import (