diff --git a/pkg/iplibrary/.gitignore b/pkg/iplibrary/.gitignore
index 893b37f..0373235 100644
--- a/pkg/iplibrary/.gitignore
+++ b/pkg/iplibrary/.gitignore
@@ -1 +1 @@
-     ip.db
\ No newline at end of file
+ip.db
\ No newline at end of file
diff --git a/pkg/iplibrary/ip.db b/pkg/iplibrary/ip.db
deleted file mode 100644
index 9dd733c..0000000
Binary files a/pkg/iplibrary/ip.db and /dev/null differ
diff --git a/pkg/iplibrary/reader.go b/pkg/iplibrary/reader.go
index b1bf460..fe10444 100644
--- a/pkg/iplibrary/reader.go
+++ b/pkg/iplibrary/reader.go
@@ -169,14 +169,15 @@ func (this *Reader) parse(data []byte) (left []byte, err error) {
 				return nil, errors.New("invalid ip version '" + string(line) + "'")
 			}
 
+			var ipFrom uint64
+			var ipTo uint64
 			if len(pieces[2]) == 0 {
 				pieces[2] = pieces[1]
-			}
-
-			var ipFrom = types.Uint64(pieces[1])
-			var ipTo = types.Uint64(pieces[2])
-			if ipFrom > ipTo {
-				ipFrom, ipTo = ipTo, ipFrom
+				ipFrom = types.Uint64(pieces[1])
+				ipTo = types.Uint64(pieces[2])
+			} else {
+				ipFrom = types.Uint64(pieces[1])
+				ipTo = types.Uint64(pieces[2]) + ipFrom
 			}
 
 			if version == "4" {
diff --git a/pkg/iplibrary/writer.go b/pkg/iplibrary/writer.go
index 9748b17..f5fa234 100644
--- a/pkg/iplibrary/writer.go
+++ b/pkg/iplibrary/writer.go
@@ -96,13 +96,20 @@ func (this *Writer) Write(ipFrom string, ipTo string, countryId int64, provinceI
 	}
 
 	// 1
-	pieces = append(pieces, types.String(configutils.IP2Long(fromIP)))
+	var fromIPLong = configutils.IP2Long(fromIP)
+	var toIPLong = configutils.IP2Long(toIP)
+
+	if toIPLong < fromIPLong {
+		fromIPLong, toIPLong = toIPLong, fromIPLong
+	}
+
+	pieces = append(pieces, types.String(fromIPLong))
 	if ipFrom == ipTo {
 		// 2
 		pieces = append(pieces, "")
 	} else {
 		// 2
-		pieces = append(pieces, types.String(configutils.IP2Long(toIP)))
+		pieces = append(pieces, types.String(toIPLong-fromIPLong))
 	}
 
 	// 3