diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7ed4fb36b27ef..4e7e70e30b106 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -44,6 +44,7 @@
 * [10451](https://github.com/grafana/loki/pull/10451) **shantanualsi** Upgrade thanos `objstore`
 * [10814](https://github.com/grafana/loki/pull/10814) **shantanualsi,kaviraj** Upgrade prometheus to v0.47.1 and dskit
 * [10959](https://github.com/grafana/loki/pull/10959) **slim-bean** introduce a backoff wait on subquery retries.
+* [11121](https://github.com/grafana/loki/pull/11121) **periklis** Ensure all lifecycler cfgs ref a valid IPv6 addr and port combination
 
 #### Promtail
 
diff --git a/pkg/distributor/distributor_ring.go b/pkg/distributor/distributor_ring.go
index fa0b04b237f8d..0c7451ebdea2f 100644
--- a/pkg/distributor/distributor_ring.go
+++ b/pkg/distributor/distributor_ring.go
@@ -2,8 +2,9 @@ package distributor
 
 import (
 	"flag"
-	"fmt"
+	"net"
 	"os"
+	"strconv"
 	"time"
 
 	"github.com/go-kit/log"
@@ -72,7 +73,7 @@ func (cfg *RingConfig) ToBasicLifecyclerConfig(logger log.Logger) (ring.BasicLif
 
 	return ring.BasicLifecyclerConfig{
 		ID:                              cfg.InstanceID,
-		Addr:                            fmt.Sprintf("%s:%d", instanceAddr, instancePort),
+		Addr:                            net.JoinHostPort(instanceAddr, strconv.Itoa(instancePort)),
 		HeartbeatPeriod:                 cfg.HeartbeatPeriod,
 		HeartbeatTimeout:                cfg.HeartbeatTimeout,
 		TokensObservePeriod:             0,
diff --git a/pkg/ruler/base/ruler_ring.go b/pkg/ruler/base/ruler_ring.go
index ec1f19f6cfe19..697b1d8b9ac59 100644
--- a/pkg/ruler/base/ruler_ring.go
+++ b/pkg/ruler/base/ruler_ring.go
@@ -3,7 +3,9 @@ package base
 import (
 	"flag"
 	"fmt"
+	"net"
 	"os"
+	"strconv"
 	"time"
 
 	"github.com/go-kit/log"
@@ -88,7 +90,7 @@ func (cfg *RingConfig) ToLifecyclerConfig(logger log.Logger) (ring.BasicLifecycl
 
 	return ring.BasicLifecyclerConfig{
 		ID:                  cfg.InstanceID,
-		Addr:                fmt.Sprintf("%s:%d", instanceAddr, instancePort),
+		Addr:                net.JoinHostPort(instanceAddr, strconv.Itoa(instancePort)),
 		HeartbeatPeriod:     cfg.HeartbeatPeriod,
 		TokensObservePeriod: 0,
 		NumTokens:           cfg.NumTokens,
diff --git a/pkg/util/ring/ring_config.go b/pkg/util/ring/ring_config.go
index 962c48d940bb8..eb9945ffcb3ec 100644
--- a/pkg/util/ring/ring_config.go
+++ b/pkg/util/ring/ring_config.go
@@ -2,8 +2,9 @@ package ring
 
 import (
 	"flag"
-	"fmt"
+	"net"
 	"os"
+	"strconv"
 	"time"
 
 	"github.com/go-kit/log"
@@ -81,7 +82,7 @@ func (cfg *RingConfig) ToLifecyclerConfig(numTokens int, logger log.Logger) (rin
 
 	return ring.BasicLifecyclerConfig{
 		ID:                  cfg.InstanceID,
-		Addr:                fmt.Sprintf("%s:%d", instanceAddr, instancePort),
+		Addr:                net.JoinHostPort(instanceAddr, strconv.Itoa(instancePort)),
 		Zone:                cfg.InstanceZone,
 		HeartbeatPeriod:     cfg.HeartbeatPeriod,
 		TokensObservePeriod: 0,