diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 964b446..1516d7f 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -28,7 +28,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29
+      uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332
 
     - name: Set up Go
       uses: actions/setup-go@cdcb36043654635271a94b9a6d1392de5bb323a7
diff --git a/.github/workflows/go-test.yml b/.github/workflows/go-test.yml
index 1fe6561..2b166ef 100644
--- a/.github/workflows/go-test.yml
+++ b/.github/workflows/go-test.yml
@@ -13,7 +13,7 @@ jobs:
   build-and-test:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29
+    - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332
 
     - name: Set up Go
       uses: actions/setup-go@cdcb36043654635271a94b9a6d1392de5bb323a7
diff --git a/.github/workflows/golangci-lint.yml b/.github/workflows/golangci-lint.yml
index 906ffdf..e8eca40 100644
--- a/.github/workflows/golangci-lint.yml
+++ b/.github/workflows/golangci-lint.yml
@@ -11,7 +11,7 @@ jobs:
     name: golangci-lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29
+      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332
       - uses: actions/setup-go@cdcb36043654635271a94b9a6d1392de5bb323a7
         with:
           go-version-file: ./go.mod
diff --git a/.github/workflows/make-release.yaml b/.github/workflows/make-release.yaml
index d1e2b4a..6c12d1e 100644
--- a/.github/workflows/make-release.yaml
+++ b/.github/workflows/make-release.yaml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the repo
-        uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332
 
       - name: Set up Go
         uses: actions/setup-go@cdcb36043654635271a94b9a6d1392de5bb323a7
diff --git a/pkg/ipblock/ipblock.go b/pkg/ipblock/ipblock.go
index 6380d6d..5515260 100644
--- a/pkg/ipblock/ipblock.go
+++ b/pkg/ipblock/ipblock.go
@@ -151,6 +151,9 @@ func (b *IPBlock) Split() []*IPBlock {
 
 // intToIP4 returns a string of an ip address from an input integer ip value
 func intToIP4(ipInt int64) string {
+	if ipInt < 0 || ipInt > math.MaxUint32 {
+		return "0.0.0.0"
+	}
 	var d [4]byte
 	binary.BigEndian.PutUint32(d[:], uint32(ipInt))
 	return net.IPv4(d[0], d[1], d[2], d[3]).String()