diff --git a/multiaddr/multiaddr.go b/multiaddr/multiaddr.go
new file mode 100644
index 0000000..3262ad5
--- /dev/null
+++ b/multiaddr/multiaddr.go
@@ -0,0 +1,96 @@
+package main
+
+import (
+	"encoding/hex"
+	"flag"
+	"fmt"
+	"os"
+
+	ma "github.com/jbenet/go-multiaddr"
+	manet "github.com/jbenet/go-multiaddr/net"
+)
+
+// flags
+var formats = []string{"string", "bytes", "hex", "slice"}
+var format string
+var hideLoopback bool
+
+func init() {
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, "usage: %s [<multiaddr>]\n\nFlags:\n", os.Args[0])
+		flag.PrintDefaults()
+	}
+
+	usage := fmt.Sprintf("output format, one of: %v", formats)
+	flag.StringVar(&format, "format", "string", usage)
+	flag.StringVar(&format, "f", "string", usage+" (shorthand)")
+	flag.BoolVar(&hideLoopback, "hide-loopback", false, "do not display loopback addresses")
+}
+
+func main() {
+	flag.Parse()
+	args := flag.Args()
+	if len(args) == 0 {
+		output(localAddresses()...)
+	} else {
+		output(address(args[0]))
+	}
+}
+
+func localAddresses() []ma.Multiaddr {
+	maddrs, err := manet.InterfaceMultiaddrs()
+	if err != nil {
+		die(err)
+	}
+
+	if !hideLoopback {
+		return maddrs
+	}
+
+	var maddrs2 []ma.Multiaddr
+	for _, a := range maddrs {
+		if !manet.IsIPLoopback(a) {
+			maddrs2 = append(maddrs2, a)
+		}
+	}
+
+	return maddrs2
+}
+
+func address(addr string) ma.Multiaddr {
+	m, err := ma.NewMultiaddr(addr)
+	if err != nil {
+		die(err)
+	}
+
+	return m
+}
+
+func output(ms ...ma.Multiaddr) {
+	for _, m := range ms {
+		fmt.Println(outfmt(m))
+	}
+}
+
+func outfmt(m ma.Multiaddr) string {
+	switch format {
+	case "string":
+		return m.String()
+	case "slice":
+		return fmt.Sprintf("%v", m.Bytes())
+	case "bytes":
+		return string(m.Bytes())
+	case "hex":
+		return "0x" + hex.EncodeToString(m.Bytes())
+	}
+
+	die("error: invalid format", format)
+	return ""
+}
+
+func die(v ...interface{}) {
+	fmt.Fprint(os.Stderr, v...)
+	fmt.Fprint(os.Stderr, "\n")
+	flag.Usage()
+	os.Exit(-1)
+}