diff --git a/src/models/ip.go b/src/models/ip.go
index 9ca914e..065ab19 100644
--- a/src/models/ip.go
+++ b/src/models/ip.go
@@ -295,7 +295,7 @@ func (ip *APIIP) BeforeInsert() (err error) {
 
 type IP struct {
 	ID               int               `xorm:"pk autoincr"`
-	IP               string            `xorm:"text notnull"`
+	IP               string            `xorm:"text notnull unique"`
 	Rdns             sql.NullString    `xorm:"text index default ''"`
 	AutonomousSystem *AutonomousSystem `xorm:"as_id int index default null"`
 	City             *City             `xorm:"city_id int index default null"`