diff --git a/scripts/tor-consensus-checker.nse b/scripts/tor-consensus-checker.nse
new file mode 100644
index 000000000..fa5c90779
--- /dev/null
+++ b/scripts/tor-consensus-checker.nse
@@ -0,0 +1,124 @@
+local http = require "http"
+local stdnse = require "stdnse"
+local nmap = require "nmap"
+
+description = [[
+Checks if a target is a known Tor node.
+
+The script works by querying the Tor directory authorities. Initially, 
+the script stores all IPs of Tor nodes in a lookup table to reduce the
+number of requests and make lookups quicker. 
+]]
+
+---
+-- @usage
+-- nmap --script=tor-consensus-checker <host>
+--
+-- @output
+-- Host script results:
+-- | tor-consensus-checker: 
+-- |_  127.0.0.1 is a Tor node
+---
+
+author = "Jiayi Ye"
+license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
+categories = {"external", "safe"}
+
+-- from Tor 0.2.6.7/src/or/config.c
+local dir_authorities = {
+  { ip = "128.31.0.39", port = "9131"},
+  { ip = "86.59.21.38", port = "80" },
+  { ip = "194.109.206.212", port = "80" },
+  { ip = "82.94.251.203", port = "80" },
+  { ip = "131.188.40.189", port = "80"},
+  { ip = "193.23.244.244", port = "80"},
+  { ip = "208.83.223.34", port = "443" },
+  { ip = "171.25.193.9", port = "443" },
+  { ip = "154.35.175.225", port = "80" },
+  { ip = "199.254.238.52", port = "80" }           
+}
+
+hostrule = function(host) 
+  if nmap.registry.tornode and not(nmap.registry.tornode.connect) then
+    return false
+  end
+  return true 
+end
+
+function get_consensus(server)
+  local response = http.get(server.ip, server.port, "/tor/status-vote/current/consensus")
+  
+  if not response.status then
+    stdnse.print_debug(2, "failed to connect to " .. server.ip)
+  elseif response.status ~= 200  then
+    stdnse.print_debug(2, "%s http error %s", server.ip, response.status)
+  else
+    stdnse.print_debug(2, "consensus retrieved from %s", server.ip)        
+    return response.body
+  end              
+
+  -- no valid server found
+  return nil
+end
+
+function script_init()
+  -- Data and flags shared between threads.
+  -- @name tornode
+  -- @class table
+  -- @field cache     A table for cached tor nodes
+  -- @field connect   A flag which prevents threads from looking up when failed to connnect to directory authorities
+  nmap.registry.tornode = {}
+  nmap.registry.tornode.cache = {}
+  
+  local isConnected = false
+  local regexp = "r [%S]+ [%S]+ [%S]+ [%d-]+ [%d:]+ ([%d.]+) ([%d]+) [%d]*"
+  for _, server in ipairs(dir_authorities) do
+    local consensus = get_consensus(server)
+    if consensus then
+       isConnected = true 
+       -- parse the consensus
+       for line in string.gmatch(consensus,"[^\n]+") do  
+         local _, _, ip, port = string.find(line,regexp)
+         if ip then
+           nmap.registry.tornode.cache[ip] = true
+         end      
+       end           
+    end
+  end
+  if not(isConnected) then
+    stdnse.print_verbose("failed to connect to directory authorities")
+  end
+  nmap.registry.tornode.connect = isConnected
+end
+
+function check_tornode_cache(ip)
+  if not next( nmap.registry.tornode.cache ) then return false end
+  if type( ip ) ~= "string" or ip == "" then return false end
+  return nmap.registry.tornode.cache[ip] 
+end
+
+action = function(host)  
+  local mutex = nmap.mutex("tornode")
+  mutex "lock"
+  --initialize nmap.registry.tornode
+  if not nmap.registry.tornode then
+    script_init()
+  end
+  mutex "done"
+  
+  if not(nmap.registry.tornode.connect) then
+    if nmap.verbosity() > 2 then
+      return "Couln't connect to Tor dir authorities"
+    else
+      return nil
+    end
+  end
+  
+  local output_tab = stdnse.output_table() 
+  if check_tornode_cache(host.ip) then
+    output_tab.tor_nodes = host.ip
+    return output_tab, host.ip .. " is a Tor node"
+  else
+    return output_tab, host.ip .. " not found in Tor consensus"
+  end
+ end
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