diff --git a/core/netutil/ip.go b/core/netutil/ip.go
index 04ff01fd..c3e69328 100644
--- a/core/netutil/ip.go
+++ b/core/netutil/ip.go
@@ -13,8 +13,8 @@ https://github.com/kataras/iris/issues/1453
 
 // IPRange is a structure that holds the start and end of a range of IP Addresses.
 type IPRange struct {
-	Start net.IP `json:"start" yaml:"Start" toml"Start"`
-	End   net.IP `json:"end" yaml:"End" toml"End"`
+	Start net.IP `json:"start" yaml:"Start" toml:"Start"`
+	End   net.IP `json:"end" yaml:"End" toml:"End"`
 }
 
 // IPInRange reports whether a given IP Address is within a range given.