diff --git a/context/context.go b/context/context.go
new file mode 100644
index 0000000..af2a83c
--- /dev/null
+++ b/context/context.go
@@ -0,0 +1,7 @@
+package context
+
+type ContextKey string
+
+func (c ContextKey) String() string {
+	return string(c)
+}
diff --git a/net/converter/ip.go b/net/converter/ip.go
index c5d846b..a70194c 100644
--- a/net/converter/ip.go
+++ b/net/converter/ip.go
@@ -20,10 +20,10 @@ func IPToUint64(ip string) uint64 {
 	if !isV4 {
 		return ipv6ToUint64(ip)
 	}
-	return ipv4ToUint64(ip)
+	return IPV4ToUint64(ip)
 }
 
-func ipv4ToUint64(s string) uint64 {
+func IPV4ToUint64(s string) uint64 {
 	bits := strings.Split(s, ".")
 
 	b0, _ := strconv.Atoi(bits[0])