diff --git a/.github/workflows/test-integration.yaml b/.github/workflows/test-integration.yaml
index 590ec28c5e..9a6da2868d 100644
--- a/.github/workflows/test-integration.yaml
+++ b/.github/workflows/test-integration.yaml
@@ -21,9 +21,9 @@ jobs:
           echo "PATH=${{ github.workspace }}/hack/bin:$PATH" >> "$GITHUB_ENV"
           echo "TEKTON_TESTS_ENABLED=1" >> "$GITHUB_ENV"
           echo "GITLAB_TESTS_ENABLED=1" >> "$GITHUB_ENV"
-          echo "GITLAB_HOSTNAME=gitlab.127.0.0.1.sslip.io" >> "$GITHUB_ENV"
+          echo "GITLAB_HOSTNAME=gitlab.localtest.me" >> "$GITHUB_ENV"
           echo "GITLAB_ROOT_PASSWORD=$(< /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c${1:-32})" >> "$GITHUB_ENV"
-          echo "PAC_CONTROLLER_HOSTNAME=pac-ctr.127.0.0.1.sslip.io" >> "$GITHUB_ENV"
+          echo "PAC_CONTROLLER_HOSTNAME=pac-ctr.localtest.me" >> "$GITHUB_ENV"
       - uses: actions/checkout@v4
       - uses: knative/actions/setup-go@main
       - uses: imjasonh/setup-ko@v0.6
diff --git a/docs/CONTRIBUTING.md b/docs/CONTRIBUTING.md
index 6a21f067b5..04da7fe675 100644
--- a/docs/CONTRIBUTING.md
+++ b/docs/CONTRIBUTING.md
@@ -102,7 +102,7 @@ On other systems, add `127.0.0.1 kind-registry` to your local `hosts` file and `
 
 Once the cluster has been allocated, the `func` CLI (or client library) will automatically use it (see the [Kubeconfig Docs](https://kubernetes.io/docs/concepts/configuration/organize-cluster-access-kubeconfig/) for more)
 
-Functions will be available at the address `[Function Name].default.127.0.0.1.sslip.io`
+Functions will be available at the address `[Function Name].default.localtest.me`
 
 To run integration tests, use `make test-integration`.
 
diff --git a/hack/allocate.sh b/hack/allocate.sh
index 767bdefb53..deaef14b9b 100755
--- a/hack/allocate.sh
+++ b/hack/allocate.sh
@@ -115,7 +115,7 @@ dns() {
     $KUBECTL patch configmap/config-domain \
     --namespace knative-serving \
     --type merge \
-    --patch '{"data":{"127.0.0.1.sslip.io":""}}' && break
+    --patch '{"data":{"localtest.me":""}}' && break
 
     (( i+=1 ))
     if (( i>=n )); then
@@ -402,7 +402,7 @@ tekton() {
 pac() {
   echo "${blue}Installing PAC (Pipelines-as-Code) ${pac_version} ${reset}"
 
-  local -r pac_ctr_host="${PAC_CONTROLLER_HOSTNAME:-pac-ctr.127.0.0.1.sslip.io}"
+  local -r pac_ctr_host="${PAC_CONTROLLER_HOSTNAME:-pac-ctr.localtest.me}"
 
   # Install Pipelines as Code
   $KUBECTL apply -f "https://raw.githubusercontent.com/openshift-pipelines/pipelines-as-code/release-${pac_version}/release.k8s.yaml"
diff --git a/hack/install-gitlab.sh b/hack/install-gitlab.sh
index c99085f5fd..cd470e8c3f 100755
--- a/hack/install-gitlab.sh
+++ b/hack/install-gitlab.sh
@@ -21,7 +21,7 @@ source "$(dirname "$(realpath "$0")")/common.sh"
 function install_gitlab() {
   echo "${blue}Installing GitLab${reset}"
 
-  local -r gitlab_host="${GITLAB_HOSTNAME:-gitlab.127.0.0.1.sslip.io}"
+  local -r gitlab_host="${GITLAB_HOSTNAME:-gitlab.localtest.me}"
 
   $KUBECTL apply -f - <<EOF
 kind: Namespace
diff --git a/hack/patch-hosts.sh b/hack/patch-hosts.sh
index 8d78eac291..5e8f84f89e 100755
--- a/hack/patch-hosts.sh
+++ b/hack/patch-hosts.sh
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 #
-# Create DNS A records for '127.0.0.1.sslip.io' and '*.127.0.0.1.sslip.io' pointing to the cluster node.
+# Create DNS A records for 'localtest.me' and '*.localtest.me' pointing to the cluster node.
 #
 
 source "$(dirname "$(realpath "$0")")/common.sh"
@@ -28,8 +28,8 @@ function patch_hosts() {
   $KUBECTL patch cm/coredns -n kube-system --patch-file /dev/stdin <<EOF
 {
   "data": {
-    "Corefile": ".:53 {\n    errors\n    health {\n       lameduck 5s\n    }\n    ready\n    kubernetes cluster.local in-addr.arpa ip6.arpa {\n       pods insecure\n       fallthrough in-addr.arpa ip6.arpa\n       ttl 30\n    }\n    file /etc/coredns/example.db 127.0.0.1.sslip.io\n    prometheus :9153\n    forward . /etc/resolv.conf {\n       max_concurrent 1000\n    }\n    cache 30\n    loop\n    reload\n    loadbalance\n}\n",
-    "example.db": "; 127.0.0.1.sslip.io test file\n127.0.0.1.sslip.io.            IN      SOA     sns.dns.icann.org. noc.dns.icann.org. 2015082541 7200 3600 1209600 3600\n127.0.0.1.sslip.io.            IN      A       ${cluster_node_addr}\n*.127.0.0.1.sslip.io.          IN      A       ${cluster_node_addr}\n"
+    "Corefile": ".:53 {\n    errors\n    health {\n       lameduck 5s\n    }\n    ready\n    kubernetes cluster.local in-addr.arpa ip6.arpa {\n       pods insecure\n       fallthrough in-addr.arpa ip6.arpa\n       ttl 30\n    }\n    file /etc/coredns/example.db localtest.me\n    prometheus :9153\n    forward . /etc/resolv.conf {\n       max_concurrent 1000\n    }\n    cache 30\n    loop\n    reload\n    loadbalance\n}\n",
+    "example.db": "; localtest.me test file\nlocaltest.me.            IN      SOA     sns.dns.icann.org. noc.dns.icann.org. 2015082541 7200 3600 1209600 3600\nlocaltest.me.            IN      A       ${cluster_node_addr}\n*.localtest.me.          IN      A       ${cluster_node_addr}\n"
   }
 }
 EOF
diff --git a/hack/test.sh b/hack/test.sh
index 34ef7498d3..c15811a25d 100755
--- a/hack/test.sh
+++ b/hack/test.sh
@@ -43,7 +43,7 @@ EOF
   kubectl wait --for=condition=Ready route echo -n func --timeout=600s
 
   echo "${blue}Invoking echo server${reset}"
-  curl http://echo.func.127.0.0.1.sslip.io/
+  curl http://echo.func.localtest.me/
 
   echo "${green}✅ Echo succeeded${reset}"
 }
diff --git a/pkg/builders/builders_int_test.go b/pkg/builders/builders_int_test.go
index c9124565a9..ffc55c78ce 100644
--- a/pkg/builders/builders_int_test.go
+++ b/pkg/builders/builders_int_test.go
@@ -70,7 +70,7 @@ func TestPrivateGitRepository(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	gitCred := `url=https://git-private.127.0.0.1.sslip.io
+	gitCred := `url=https://git-private.localtest.me
 username=developer
 password=nbusr123
 `
@@ -80,7 +80,7 @@ password=nbusr123
 	}
 
 	netrc := filepath.Join(t.TempDir(), ".netrc")
-	netrcContent := `machine git-private.127.0.0.1.sslip.io login developer password nbusr123`
+	netrcContent := `machine git-private.localtest.me login developer password nbusr123`
 	err = os.WriteFile(netrc, []byte(netrcContent), 0644)
 	if err != nil {
 		t.Fatal(err)
@@ -93,7 +93,7 @@ password=nbusr123
 	f.Build.BuildEnvs = []fn.Env{
 		{
 			Name:  ptr("GOPRIVATE"),
-			Value: ptr("*.127.0.0.1.sslip.io"),
+			Value: ptr("*.localtest.me"),
 		},
 	}
 
@@ -167,13 +167,13 @@ func createCertificate(t *testing.T) string {
 		BasicConstraintsValid: true,
 		IsCA:                  true,
 		SerialNumber:          randSN(),
-		// openssl hash of this subject is 712d4c9d
+		// openssl hash of this subject is 85c05568
 		// do not update the subject without also updating the hash referred from another places (e.g. Dockerfile)
 		// See also: https://github.com/paketo-buildpacks/ca-certificates/blob/v1.0.1/cacerts/certs.go#L132
 		Subject: pkix.Name{
-			CommonName: "git-private.127.0.0.1.sslip.io",
+			CommonName: "git-private.localtest.me",
 		},
-		DNSNames:     []string{"git-private.127.0.0.1.sslip.io"},
+		DNSNames:     []string{"git-private.localtest.me"},
 		NotBefore:    time.Now(),
 		NotAfter:     time.Now().AddDate(0, 0, 1),
 		SubjectKeyId: ski[:],
@@ -231,7 +231,7 @@ func randSN() *big.Int {
 func buildPatchedS2IBuilder(ctx context.Context, t *testing.T, certDir string) string {
 	tag := "localhost:50000/go-toolset:test"
 	dockerfile := `FROM registry.access.redhat.com/ubi8/go-toolset:latest
-COPY 712d4c9d.0 /etc/pki/ca-trust/source/anchors/
+COPY 85c05568.0 /etc/pki/ca-trust/source/anchors/
 USER 0:0
 RUN update-ca-trust
 USER 1001:0
@@ -243,13 +243,13 @@ USER 1001:0
 func buildPatcheBuildpackBuilder(ctx context.Context, t *testing.T, certDir string) string {
 	tag := "localhost:50000/builder-jammy-tin:test"
 	dockerfile := `FROM ghcr.io/knative/builder-jammy-tiny:latest
-COPY 712d4c9d.0 /etc/ssl/certs/
+COPY 85c05568.0 /etc/ssl/certs/
 `
 	return buildPatchedBuilder(ctx, t, tag, dockerfile, certDir)
 }
 
 // Builds an image with specified tag from specified dockerfile.
-// This function also injects self-signed as "712d4c9d.0" into the build context.
+// This function also injects self-signed as "85c05568.0" into the build context.
 func buildPatchedBuilder(ctx context.Context, t *testing.T, tag, dockerfile, certDir string) string {
 	cli, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
 	if err != nil {
@@ -277,7 +277,7 @@ func buildPatchedBuilder(ctx context.Context, t *testing.T, tag, dockerfile, cer
 		t.Fatal(err)
 	}
 	err = tw.WriteHeader(&tar.Header{
-		Name: "712d4c9d.0",
+		Name: "85c05568.0",
 		Size: int64(len(cb)),
 		Mode: 0644,
 	})
@@ -320,12 +320,12 @@ func buildPatchedBuilder(ctx context.Context, t *testing.T, tag, dockerfile, cer
 }
 
 // This sets up a private git repository for testing.
-// The repository url is https://git-private.127.0.0.1.sslip.io/foo.git, and it is protected by basic authentication.
+// The repository url is https://git-private.localtest.me/foo.git, and it is protected by basic authentication.
 // The credentials are developer:nbusr123.
 func servePrivateGit(ctx context.Context, t *testing.T, certDir string) {
 	const (
 		name  = "git-private"
-		host  = "git-private.127.0.0.1.sslip.io"
+		host  = "git-private.localtest.me"
 		image = "ghcr.io/matejvasek/git-private:latest"
 	)
 
diff --git a/pkg/builders/testdata/go-fn-with-private-deps/go.mod b/pkg/builders/testdata/go-fn-with-private-deps/go.mod
index 4792cedaa8..8f5678bee7 100644
--- a/pkg/builders/testdata/go-fn-with-private-deps/go.mod
+++ b/pkg/builders/testdata/go-fn-with-private-deps/go.mod
@@ -2,4 +2,4 @@ module function
 
 go 1.22
 
-require git-private.127.0.0.1.sslip.io/foo.git v0.0.0-20250319130200-b1126104a200 // indirect
+require git-private.localtest.me/foo.git v0.0.0-20250704181237-d1e4de9dcd02 // indirect
diff --git a/pkg/builders/testdata/go-fn-with-private-deps/go.sum b/pkg/builders/testdata/go-fn-with-private-deps/go.sum
index db60afd9a3..cdad28f6cf 100644
--- a/pkg/builders/testdata/go-fn-with-private-deps/go.sum
+++ b/pkg/builders/testdata/go-fn-with-private-deps/go.sum
@@ -1,4 +1,2 @@
-git-private.127.0.0.1.sslip.io/foo.git v0.0.0-20250312185939-e7bf19abfd77 h1:IJ6SiucMsd0bjPwuj3VIGCHN225+0lCU1OZSmsg3Rjk=
-git-private.127.0.0.1.sslip.io/foo.git v0.0.0-20250312185939-e7bf19abfd77/go.mod h1:rG9yzCHOSu2zUBmaB7GEu7RBsjiJZRUP1hy26O5CLsc=
-git-private.127.0.0.1.sslip.io/foo.git v0.0.0-20250319130200-b1126104a200 h1:moO2xbNMRhtKOUjzkXNgtv0y3k2Xo+xP9N4MagWSXe0=
-git-private.127.0.0.1.sslip.io/foo.git v0.0.0-20250319130200-b1126104a200/go.mod h1:8MJdyAVONQdluGP17pXr5Lu//oVu7YHyXBE29FDEEng=
+git-private.localtest.me/foo.git v0.0.0-20250704181237-d1e4de9dcd02 h1:8zZccH+dkzYMYRJN+sPw4fed4NlwC5W9hfNM4kl6RlM=
+git-private.localtest.me/foo.git v0.0.0-20250704181237-d1e4de9dcd02/go.mod h1:jqnvPQqnKYxxNNRBi9Wmpo5coeutnzAYIim12Lo9qRc=
diff --git a/pkg/builders/testdata/go-fn-with-private-deps/handle.go b/pkg/builders/testdata/go-fn-with-private-deps/handle.go
index d2ac8d4e14..21768ee177 100644
--- a/pkg/builders/testdata/go-fn-with-private-deps/handle.go
+++ b/pkg/builders/testdata/go-fn-with-private-deps/handle.go
@@ -4,7 +4,7 @@ import (
 	"fmt"
 	"net/http"
 
-	"git-private.127.0.0.1.sslip.io/foo.git/pkg/foo"
+	"git-private.localtest.me/foo.git/pkg/foo"
 )
 
 // Handle an HTTP Request.
diff --git a/pkg/pipelines/tekton/pipelines_int_test.go b/pkg/pipelines/tekton/pipelines_int_test.go
index ae05aea275..997471efea 100644
--- a/pkg/pipelines/tekton/pipelines_int_test.go
+++ b/pkg/pipelines/tekton/pipelines_int_test.go
@@ -64,7 +64,7 @@ func newRemoteTestClient(verbose bool) *fn.Client {
 func assertFunctionEchoes(url string) (err error) {
 	token := time.Now().Format("20060102150405.000000000")
 
-	// res, err := http.Get("http://testremote-default.default.127.0.0.1.sslip.io?token=" + token)
+	// res, err := http.Get("http://testremote-default.default.localtest.me?token=" + token)
 	res, err := http.Get(url + "?token=" + token)
 	if err != nil {
 		return
diff --git a/test/e2e/scenario_subscribe_test.go b/test/e2e/scenario_subscribe_test.go
index 6afdfc2da8..cd3a96ee56 100644
--- a/test/e2e/scenario_subscribe_test.go
+++ b/test/e2e/scenario_subscribe_test.go
@@ -66,7 +66,7 @@ func (f *FuncSubscribeTestType) setupBroker() {
 
 // setupProducerFunc creates and deploy a knative function that produces events
 // It will take 'type' and 'message' from query string to build and send an event to a TARGET_SINK (env var)
-// Example: https://func-producer.default.127.0.0.1.sslip.io?type=HelloEvent&message=HELLO+EVENT+1
+// Example: https://func-producer.default.localtest.me?type=HelloEvent&message=HELLO+EVENT+1
 func (f *FuncSubscribeTestType) setupProducerFunc() {
 
 	var funcProducerName = "func-producer"