diff --git a/dist/bin/kctf-cluster b/dist/bin/kctf-cluster
index 823b57f0..9ee11355 100755
--- a/dist/bin/kctf-cluster
+++ b/dist/bin/kctf-cluster
@@ -651,7 +651,7 @@ function kctf_cluster_start_gce {
 
     gcloud projects add-iam-policy-binding ${PROJECT} --member=serviceAccount:${DNS_GSA_EMAIL} --role=roles/dns.admin || return
 
-    "${KCTF_BIN}/kubectl" create configmap --namespace kctf-system external-dns --from-literal=DOMAIN_NAME=${DOMAIN_NAME} --from-literal=EMAIL_ADDRESS=${EMAIL_ADDRESS:-} --dry-run=client -o yaml | "${KCTF_BIN}/kubectl" apply -f - || return
+    "${KCTF_BIN}/kubectl" create configmap --namespace kctf-system external-dns --from-literal=DOMAIN_NAME=${DOMAIN_NAME} --from-literal=EMAIL_ADDRESS=${EMAIL_ADDRESS:-} --from-literal=CLUSTER_NAME=${CLUSTER_NAME:-} --dry-run=client -o yaml | "${KCTF_BIN}/kubectl" apply -f - || return
   fi
 
   if [[ "${DISABLE_SRC_RANGES}" == "0" ]]; then
diff --git a/kctf-operator/resources/external-dns.go b/kctf-operator/resources/external-dns.go
index 6402dd80..230fc68e 100644
--- a/kctf-operator/resources/external-dns.go
+++ b/kctf-operator/resources/external-dns.go
@@ -86,10 +86,20 @@ func NewExternalDnsDeployment() client.Object {
 										Key: "DOMAIN_NAME",
 									},
 								},
-							}},
+							}, {
+								Name: "CLUSTER_NAME",
+								ValueFrom: &corev1.EnvVarSource{
+									ConfigMapKeyRef: &corev1.ConfigMapKeySelector{
+										LocalObjectReference: corev1.LocalObjectReference{
+											Name: "external-dns",
+										},
+										Key: "CLUSTER_NAME",
+									},
+								},
+							}, },
 							Args: []string{"--log-level=debug", "--source=service", "--source=ingress",
 								"--provider=google", "--domain-filter=$(DOMAIN_NAME)", "--registry=txt",
-								"--txt-owner-id=kctf-cloud-dns"},
+								"--txt-owner-id=kctf-cloud-dns-$(CLUSTER_NAME)"},
 						},
 						{
 							Image: DOCKER_CERTBOT_IMAGE,