iplist/cmd/iplist/main.go | 32 ++++++++++++++++++++++++++++++++

diff --git a/iplist/cmd/iplist/main.go b/iplist/cmd/iplist/main.go
new file mode 100644
index 0000000000000000000000000000000000000000..b46ce215e7d71c0282385e1351052721d503836e
--- /dev/null
+++ b/iplist/cmd/iplist/main.go
@@ -0,0 +1,32 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net"
+	"os"
+
+	"github.com/anacrolix/tagflag"
+	"github.com/anacrolix/torrent/iplist"
+)
+
+func main() {
+	var flags = struct {
+		tagflag.StartPos
+		Ips []net.IP
+	}{}
+	tagflag.Parse(&flags)
+	il, err := iplist.NewFromReader(os.Stdin)
+	if err != nil {
+		log.Fatalf("error loading ip list: %s", err)
+	}
+	log.Printf("loaded %d ranges", il.NumRanges())
+	for _, ip := range flags.Ips {
+		r, ok := il.Lookup(ip)
+		if ok {
+			fmt.Printf("%s is in %v\n", ip, r)
+		} else {
+			fmt.Printf("%s not found\n", ip)
+		}
+	}
+}