IPSubstituting: accept CIDR

default.config

@@ -172,12 +172,16 @@ GroupFile
 BlockIP
 
 # IPSubstituting <IP1 IP'1>,<IP2 IP'2>,.....
-# �滻 DNS ���ݰ��е� IP ��ַ��ֻ֧�� IPv4 ��ַ�� (since 5.0.1)
+# �滻 DNS ���ݰ��е� IP ��ַ
+# Ҫ�滻�� IP ֧�� CIDR д�����滻Ϊ�� IP ��֧�֣����ұ��뱣����ͬ�汾
 # ���磺
 # IPSubstituting 127.0.0.1 1.2.0.127
-# ��Ч���ǰ� DNS ���ݰ������е� 127.0.0.1 ��ַ�滻Ϊ 1.2.0.127
+# ��Ч���ǰ� DNS ���ݰ������е� 127.0.0.1 ��ַ�滻Ϊ 1.2.0.127 (since 5.0.1)
+# IPSubstituting 173.245.48.0/20 173.245.48.22
+# ��Ч���ǰ� DNS ���ݰ������� 173.245.48.0/20 �ڵĵ�ַ�滻Ϊ 173.245.48.22 (since 6.5.0)
 # ���滻ͨ����������TCP �� UDP����ѯ������ DNS ���ݰ������ڻ����к� Hosts �еĽ����Ч
 # �����滻��Ŀ�ð�Ƕ��� (`,') �ָ���Ҳ����д���� `IPSubstituting'
+# ��ƥ�� IP ������ƥ�� CIDR ����
 IPSubstituting
 
 # BlockNegativeResponse <BOOLEAN>

default.en.config

@@ -201,12 +201,16 @@ GroupFile
 BlockIP
 
 # IPSubstituting <IP1 IP'1>,<IP2 IP'2>,.....
-# Replace an IP with another in every response from servers(only IPv4 supported) (since 5.0.1)
+# Replace an IP with another in every response from servers
+# The IPs to be replaced support CIDR form, but the desired IP does NOT, and MUST keep the same version
 # e.g.
 #  IPSubstituting 127.0.0.1 1.2.0.127
-# Which is, replacing 127.0.0.1 with 1.2.0.127 in every response from servers
+# Which is, replacing 127.0.0.1 with 1.2.0.127 in every response from servers (since 5.0.1)
+#  IPSubstituting 173.245.48.0/20 173.245.48.22
+# will replace all IPs in 173.245.48.0/20 with 173.245.48.22 in every response from servers (since 6.5.0)
 # This option only affects responses from servers, but not responses from hosts and cache
 # Adjacent items should be separated by a comma, or split them to different lines of `IPSubstituting'
+# IP rules are tested first, and then CIDR rules.
 IPSubstituting
 
 # BlockNegativeResponse <BOOLEAN>