diff --git a/p2p/net/filter/filter.go b/p2p/net/filter/filter.go
index a6d87c07f1..63a34b7d59 100644
--- a/p2p/net/filter/filter.go
+++ b/p2p/net/filter/filter.go
@@ -2,7 +2,6 @@ package filter
 
 import (
 	"net"
-	"strings"
 	"sync"
 
 	manet "gx/ipfs/QmYVqhVfbK4BKvbW88Lhm26b3ud14sTBvcm1H7uWUx1Fkp/go-multiaddr-net"
@@ -27,18 +26,24 @@ func (fs *Filters) AddDialFilter(f *net.IPNet) {
 }
 
 func (f *Filters) AddrBlocked(a ma.Multiaddr) bool {
-	_, addr, err := manet.DialArgs(a)
+	maddr := ma.Split(a)
+	if len(maddr) == 0 {
+		return false
+	}
+	netaddr, err := manet.ToNetAddr(maddr[0])
 	if err != nil {
 		// if we cant parse it, its probably not blocked
 		return false
 	}
+	netip := net.ParseIP(netaddr.String())
+	if netip == nil {
+		return false
+	}
 
-	ipstr := strings.Split(addr, ":")[0]
-	ip := net.ParseIP(ipstr)
 	f.mu.RLock()
 	defer f.mu.RUnlock()
 	for _, ft := range f.filters {
-		if ft.Contains(ip) {
+		if ft.Contains(netip) {
 			return true
 		}
 	}
diff --git a/p2p/net/filter/filter_test.go b/p2p/net/filter/filter_test.go
new file mode 100644
index 0000000000..8a0c46a9f8
--- /dev/null
+++ b/p2p/net/filter/filter_test.go
@@ -0,0 +1,51 @@
+package filter
+
+import (
+	"net"
+	"testing"
+
+	ma "gx/ipfs/QmcobAGsCjYt5DXoq9et9L8yR8er7o7Cu3DTvpaq12jYSz/go-multiaddr"
+)
+
+func TestFilter(t *testing.T) {
+	f := NewFilters()
+	for _, cidr := range []string{
+		"1.2.3.0/24",
+		"4.3.2.1/32",
+		"fd00::/8",
+		"fc00::1/128",
+	} {
+		_, ipnet, _ := net.ParseCIDR(cidr)
+		f.AddDialFilter(ipnet)
+	}
+
+	for _, blocked := range []string{
+		"/ip4/1.2.3.4/tcp/123",
+		"/ip4/4.3.2.1/udp/123",
+		"/ip6/fd00::2/tcp/321",
+		"/ip6/fc00::1/udp/321",
+	} {
+		maddr, err := ma.NewMultiaddr(blocked)
+		if err != nil {
+			t.Error(err)
+		}
+		if !f.AddrBlocked(maddr) {
+			t.Fatalf("expected %s to be blocked", blocked)
+		}
+	}
+
+	for _, notBlocked := range []string{
+		"/ip4/1.2.4.1/tcp/123",
+		"/ip4/4.3.2.2/udp/123",
+		"/ip6/fe00::1/tcp/321",
+		"/ip6/fc00::2/udp/321",
+	} {
+		maddr, err := ma.NewMultiaddr(notBlocked)
+		if err != nil {
+			t.Error(err)
+		}
+		if f.AddrBlocked(maddr) {
+			t.Fatalf("expected %s to not be blocked", notBlocked)
+		}
+	}
+}
diff --git a/p2p/net/swarm/swarm_test.go b/p2p/net/swarm/swarm_test.go
index c69c7db38f..6c81a9c14f 100644
--- a/p2p/net/swarm/swarm_test.go
+++ b/p2p/net/swarm/swarm_test.go
@@ -303,7 +303,7 @@ func TestAddrBlocking(t *testing.T) {
 	swarms := makeSwarms(ctx, t, 2)
 
 	swarms[0].SetConnHandler(func(conn *Conn) {
-		t.Fatal("no connections should happen!")
+		t.Fatalf("no connections should happen! -- %s", conn)
 	})
 
 	_, block, err := net.ParseCIDR("127.0.0.1/8")