diff --git a/probe/host/reporter.go b/probe/host/reporter.go
index 3aff7a602..1f0ab5ce2 100644
--- a/probe/host/reporter.go
+++ b/probe/host/reporter.go
@@ -2,7 +2,6 @@ package host
 
 import (
 	"fmt"
-	"net"
 	"runtime"
 	"sync"
 	"time"
@@ -86,20 +85,7 @@ func NewReporter(hostID, hostName, probeID, version string, pipes controls.PipeC
 func (*Reporter) Name() string { return "Host" }
 
 // GetLocalNetworks is exported for mocking
-var GetLocalNetworks = func() ([]*net.IPNet, error) {
-	addrs, err := net.InterfaceAddrs()
-	if err != nil {
-		return nil, err
-	}
-	localNets := report.Networks{}
-	for _, addr := range addrs {
-		// Not all addrs are IPNets.
-		if ipNet, ok := addr.(*net.IPNet); ok {
-			localNets = append(localNets, ipNet)
-		}
-	}
-	return localNets, nil
-}
+var GetLocalNetworks = report.GetLocalNetworks
 
 // Report implements Reporter.
 func (r *Reporter) Report() (report.Report, error) {
diff --git a/report/networks.go b/report/networks.go
index 42efd5e4b..c2797760d 100644
--- a/report/networks.go
+++ b/report/networks.go
@@ -8,17 +8,11 @@ import (
 // Networks represent a set of subnets
 type Networks []*net.IPNet
 
-// Interface is exported for testing.
-type Interface interface {
-	Addrs() ([]net.Addr, error)
-}
-
-// Variables exposed for testing.
+// LocalNetworks helps in determining which addresses a probe reports
+// as being host-scoped.
+//
 // TODO this design is broken, make it consistent with probe networks.
-var (
-	LocalNetworks       = Networks{}
-	InterfaceByNameStub = func(name string) (Interface, error) { return net.InterfaceByName(name) }
-)
+var LocalNetworks = Networks{}
 
 // Contains returns true if IP is in Networks.
 func (n Networks) Contains(ip net.IP) bool {
@@ -51,12 +45,7 @@ func LocalAddresses() ([]net.IP, error) {
 			return []net.IP{}, err
 		}
 
-		for _, addr := range addrs {
-			ipnet, ok := addr.(*net.IPNet)
-			if !ok {
-				continue
-			}
-
+		for _, ipnet := range ipv4Nets(addrs) {
 			result = append(result, ipnet.IP)
 		}
 	}
@@ -68,7 +57,7 @@ func LocalAddresses() ([]net.IP, error) {
 // supplied, such that MakeAddressNodeID will scope addresses in this subnet
 // as local.
 func AddLocalBridge(name string) error {
-	inf, err := InterfaceByNameStub(name)
+	inf, err := net.InterfaceByName(name)
 	if err != nil {
 		return err
 	}
@@ -77,18 +66,27 @@ func AddLocalBridge(name string) error {
 	if err != nil {
 		return err
 	}
-	for _, addr := range addrs {
-		_, network, err := net.ParseCIDR(addr.String())
-		if err != nil {
-			return err
-		}
 
-		if network == nil {
-			continue
-		}
-
-		LocalNetworks = append(LocalNetworks, network)
-	}
+	LocalNetworks = ipv4Nets(addrs)
 
 	return nil
 }
+
+// GetLocalNetworks returns all the local networks.
+func GetLocalNetworks() ([]*net.IPNet, error) {
+	addrs, err := net.InterfaceAddrs()
+	if err != nil {
+		return nil, err
+	}
+	return ipv4Nets(addrs), nil
+}
+
+func ipv4Nets(addrs []net.Addr) []*net.IPNet {
+	nets := Networks{}
+	for _, addr := range addrs {
+		if ipnet, ok := addr.(*net.IPNet); ok && ipnet.IP.To4() != nil {
+			nets = append(nets, ipnet)
+		}
+	}
+	return nets
+}
diff --git a/report/networks_test.go b/report/networks_test.go
index a199fcf82..47ca616ac 100644
--- a/report/networks_test.go
+++ b/report/networks_test.go
@@ -4,9 +4,7 @@ import (
 	"net"
 	"testing"
 
-	"github.com/weaveworks/common/test"
 	"github.com/weaveworks/scope/report"
-	"github.com/weaveworks/scope/test/reflect"
 )
 
 func TestContains(t *testing.T) {
@@ -31,42 +29,3 @@ func mustParseCIDR(s string) *net.IPNet {
 	}
 	return ipNet
 }
-
-type mockInterface struct {
-	addrs []net.Addr
-}
-
-type mockAddr string
-
-func (m mockInterface) Addrs() ([]net.Addr, error) {
-	return m.addrs, nil
-}
-
-func (m mockAddr) Network() string {
-	return "ip+net"
-}
-
-func (m mockAddr) String() string {
-	return string(m)
-}
-
-func TestAddLocal(t *testing.T) {
-	oldInterfaceByNameStub := report.InterfaceByNameStub
-	defer func() { report.InterfaceByNameStub = oldInterfaceByNameStub }()
-
-	report.InterfaceByNameStub = func(name string) (report.Interface, error) {
-		return mockInterface{[]net.Addr{mockAddr("52.53.54.55/16")}}, nil
-	}
-
-	err := report.AddLocalBridge("foo")
-	if err != nil {
-		t.Errorf("%v", err)
-	}
-
-	want := report.Networks([]*net.IPNet{mustParseCIDR("52.53.54.55/16")})
-	have := report.LocalNetworks
-
-	if !reflect.DeepEqual(want, have) {
-		t.Errorf("%s", test.Diff(want, have))
-	}
-}