diff --git a/api/apiutil/header.go b/api/apiutil/header.go
index 4ef6ca3cb2b2..37fdf988e09b 100644
--- a/api/apiutil/header.go
+++ b/api/apiutil/header.go
@@ -56,7 +56,7 @@ func ParseAccept(header string) []mediaRange {
 	}
 
 	var out []mediaRange
-	for _, field := range strings.Split(header, ",") {
+	for field := range strings.SplitSeq(header, ",") {
 		if r, ok := parseMediaRange(field); ok {
 			out = append(out, r)
 		}
diff --git a/changelog/asttool-use-splitseq.md b/changelog/asttool-use-splitseq.md
new file mode 100644
index 000000000000..8a98c8829adc
--- /dev/null
+++ b/changelog/asttool-use-splitseq.md
@@ -0,0 +1,3 @@
+### Fixed
+
+- replace Split in loops with more efficient SplitSeq
\ No newline at end of file
diff --git a/cmd/beacon-chain/flags/api_module.go b/cmd/beacon-chain/flags/api_module.go
index 31dfe707655a..2afad7f5d185 100644
--- a/cmd/beacon-chain/flags/api_module.go
+++ b/cmd/beacon-chain/flags/api_module.go
@@ -14,7 +14,7 @@ func EnableHTTPEthAPI(httpModules string) bool {
 }
 
 func enableAPI(httpModules, api string) bool {
-	for _, m := range strings.Split(httpModules, ",") {
+	for m := range strings.SplitSeq(httpModules, ",") {
 		if strings.EqualFold(m, api) {
 			return true
 		}
diff --git a/tools/nogo_config/main.go b/tools/nogo_config/main.go
index ea1ab794189d..e546dc275dfc 100644
--- a/tools/nogo_config/main.go
+++ b/tools/nogo_config/main.go
@@ -68,7 +68,7 @@ func main() {
 		return
 	}
 
-	for _, check := range strings.Split(*checks, ",") {
+	for check := range strings.SplitSeq(*checks, ",") {
 		c.AddExclusion(strings.TrimSpace(check), e)
 	}