diff --git a/lua/dnsbl.lua b/lua/dnsbl.lua
index a39ee31..f9f78cb 100644
--- a/lua/dnsbl.lua
+++ b/lua/dnsbl.lua
@@ -1,6 +1,7 @@
-local M		= {}
-local dns	= require "dns"
+local M			= {}
+local dns		= require "dns"
 local logger	= require "logger"
+local iputils	= require "resty.iputils"
 
 function M.cached_ko ()
 	return ngx.shared.dnsbl_cache:get(ngx.var.remote_addr) == "ko"
@@ -11,6 +12,11 @@ function M.cached ()
 end
 
 function M.check (dnsbls, resolvers)
+	local local_ips = iputils.parse_cidrs({"127.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16"})
+	if iputils.ip_in_cidrs(ngx.var.remote_addr, local_ips) then
+		ngx.shared.dnsbl_cache:set(ngx.var.remote_addr, "ok", 86400)
+		return false
+	end
 	local rip = dns.ip_to_arpa()
 	for k, v in ipairs(dnsbls) do
 		local req = rip .. "." .. v