cmd/sort.go        | 13 +++++++++++++
 internal/common.go |  2 +-

diff --git a/cmd/sort.go b/cmd/sort.go
index 9e484c92c2db41410f486be81ccfc46d55ca858e47f7f7208be180290212baa6..46dd49062a79c5f28bf3e4e2bb09d39917e6de747f99070eff54562fa50a0f60 100644
--- a/cmd/sort.go
+++ b/cmd/sort.go
@@ -21,6 +21,8 @@ 	"flag"
 	"fmt"
 	"log"
 	"math/rand/v2"
+	"net"
+	"net/url"
 	"os"
 	"sort"
 	"strings"
@@ -70,6 +72,7 @@ 	by.urls[i], by.urls[j] = by.urls[j], by.urls[i]
 }
 
 func runURLSort() {
+	ipv6 := flag.Bool("6", false, "Only IPv6-capable hostnames")
 	flag.Usage = func() {
 		fmt.Fprintf(flag.CommandLine.Output(),
 			"Usage: %s [options] [cc ...] <urls.txt\n", os.Args[0])
@@ -137,6 +140,16 @@ 	sort.Stable(ByPriority(urls))
 	for _, u := range urls {
 		if u.Priority == 999999 {
 			u.Priority = 0
+		}
+		if *ipv6 {
+			parsed, err := url.Parse(u.URL)
+			if err != nil {
+				continue
+			}
+			_, err = net.ResolveIPAddr("ip6", parsed.Hostname())
+			if err != nil {
+				continue
+			}
 		}
 		fmt.Println(u)
 	}
diff --git a/internal/common.go b/internal/common.go
index 371bfc4ae04e469af638d02ac83be4e5634664e99be934e38cabbef25939cfb2..e6eea6127534e47a205d78a02e739fba3098aa4e1bb3ab8e32aeda46f631611d 100644
--- a/internal/common.go
+++ b/internal/common.go
@@ -21,7 +21,7 @@ 	"runtime"
 )
 
 const (
-	Generator       = "meta4ra/1.0.0"
+	Generator       = "meta4ra/1.1.0"
 	SigMediaTypePGP = "application/pgp-signature"
 	SigMediaTypeSSH = "application/ssh-signature"
 	BufLen          = 1 << 20