diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..33c3c9f
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,38 @@
+name: CI
+
+on:
+  pull_request:
+    branches:
+      - main
+      - master
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: '^1.17.6'
+
+      - name: Go Format
+        run: |
+          if [ -n "$(gofmt -l .)" ]; then
+            echo "Go code is not formatted:"
+            gofmt -d .
+            exit 1
+          fi
+
+      - name: Go Test
+        run: go test -v -race -coverprofile=coverage.txt -covermode=atomic
+
+      - name: Codecov
+        run: bash <(curl -s https://codecov.io/bash)
+
diff --git a/.travis.gofmt.sh b/.travis.gofmt.sh
deleted file mode 100755
index bfffdca..0000000
--- a/.travis.gofmt.sh
+++ /dev/null
@@ -1,7 +0,0 @@
-#!/bin/bash
-
-if [ -n "$(gofmt -l .)" ]; then
-  echo "Go code is not formatted:"
-  gofmt -d .
-  exit 1
-fi
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 72419ec..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,16 +0,0 @@
-language: go
-
-sudo: false
-
-go:
-  - '1.8'
-  - '1.9'
-  - '1.10'
-  - '1.11'
-
-script:
-  - ./.travis.gofmt.sh
-  - go test -v -race -coverprofile=coverage.txt -covermode=atomic
-
-after_success:
-  - bash <(curl -s https://codecov.io/bash)
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 04a714c..0839582 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # CHANGELOG
 
+## 1.1.0 (2022-01-24)
+
+* Support Go 1.17.
+* Only pack hostname but ignore numbers in domain.
+* Use github actions.
+
 ## 1.0.1 (2018-10-25)
 
 * Support go mod.
diff --git a/common.go b/common.go
index 2c5a08e..b62fee5 100644
--- a/common.go
+++ b/common.go
@@ -3,6 +3,7 @@ package hostutils
 import (
 	"regexp"
 	"strconv"
+	"strings"
 )
 
 var reComent = regexp.MustCompile(`#.*`)
@@ -48,3 +49,11 @@ func regularizeHosts(hosts []string) []string {
 	}
 	return result
 }
+
+func parseFQDN(fqdn string) (hostname, domain string) {
+	tokens := strings.SplitN(fqdn, ".", 2)
+	if len(tokens) == 2 {
+		return tokens[0], "." + tokens[1]
+	}
+	return fqdn, ""
+}
diff --git a/pack.go b/pack.go
index 026ac47..249cdcd 100644
--- a/pack.go
+++ b/pack.go
@@ -26,15 +26,16 @@ func Pack(hosts []string) (packedHosts []string) {
 func packHosts(uniqHosts []string) []string {
 	hostGroups := make(map[string][]string)
 	var result []string
-	for _, host := range uniqHosts {
-		m := reHostname.FindStringSubmatch(host)
+	for _, fqdn := range uniqHosts {
+		hostname, domain := parseFQDN(fqdn)
+		m := reHostname.FindStringSubmatch(hostname)
 		if len(m) == 0 {
-			result = append(result, host)
+			result = append(result, fqdn)
 		} else {
 			prefix := m[1]
 			num := m[2]
 			suffix := m[3]
-			key := fmt.Sprintf("%s%%s%s", prefix, suffix)
+			key := fmt.Sprintf("%s%%s%s%s", prefix, suffix, domain)
 			hostGroups[key] = append(hostGroups[key], num)
 		}
 	}
diff --git a/pack_test.go b/pack_test.go
index c0ee3b6..1e4aea6 100644
--- a/pack_test.go
+++ b/pack_test.go
@@ -94,6 +94,18 @@ func TestPack(t *testing.T) {
 			"example102c.com",
 			"example0003c.com",
 		})
+	testPack(t,
+		[]string{"example[101-102]c.grp1.com"},
+		[]string{
+			"example101c.grp1.com",
+			"example102c.grp1.com",
+		})
+	testPack(t,
+		[]string{"example[101-102]"},
+		[]string{
+			"example101",
+			"example102",
+		})
 }
 
 func TestPackString(t *testing.T) {
@@ -124,9 +136,11 @@ func TestPackString(t *testing.T) {
 }
 
 func testPack(t *testing.T, expected []string, input []string) {
+	t.Helper()
 	assert.Equal(t, expected, Pack(input))
 }
 
 func testPackString(t *testing.T, expected []string, input string) {
+	t.Helper()
 	assert.Equal(t, expected, PackString(input))
 }