local p = {}  function p._isIpV6(s)  local dcolon, groups  if type(s) ~= "string"  or s:len() == 0  or s:find("[^:%x]") -- only colon and hex digits are legal chars  or s:find("^:[^:]") -- can begin or end with :: but not with single :  or s:find("[^:]:$")  or s:find(":::")  then  return false  end  s, dcolon = s:gsub("::", ":")  if dcolon > 1 then return false end -- at most one ::  s = s:gsub("^:?", ":") -- prepend : if needed, upper  s, groups = s:gsub(":%x%x?%x?%x?", "") -- remove valid groups, and count them  return ( (dcolon == 1 and groups < 8) or (dcolon == 0 and groups == 8) )  and ( s:len() == 0 or (dcolon == 1 and s == ":") ) -- might be one dangling : if original ended with :: end  function p._isIpV4(s)  local function legal(n) return (tonumber(n) or 256) < 256 and not n:match("^0%d") end  if type(s) ~= "string" then return false end  local p1, p2, p3, p4 = s:match("^(%d+)%.(%d+)%.(%d+)%.(%d+)$")  return legal(p1) and legal(p2) and legal(p3) and legal(p4) end  function p._isIp(s)  return p._isIpV4(s) and "4" or p._isIpV6(s) and "6" end  local function input(frame)  -- Return input parameter after replacing any of following directional markers.  -- LRM : LEFT-TO-RIGHT MARK (U+200E) : hex e2 80 8e = 226 128 142  -- LRE : LEFT-TO-RIGHT EMBEDDING (U+202A) : hex e2 80 aa = 226 128 170  -- PDF : POP DIRECTIONAL FORMATTING (U+202C) : hex e2 80 ac = 226 128 172  -- This is required for MediaWiki:Blockedtext message.  return (frame.args[1] or ''):gsub('\226\128[\142\170\172]', ' ') -- replace LRM, LRE, PDF with space delimiter end  function p.isIpV6(frame) return p._isIpV6(input(frame)) and "1" or "0" end function p.isIpV4(frame) return p._isIpV4(input(frame)) and "1" or "0" end function p.isIp(frame) return p._isIp(input(frame)) or "" end  function p.isIpOrRange(frame)  -- {{#invoke:IPAddress|isIpOrRange|x}} → 'ip' (IPv4/IPv6) or 'range' (CIDR IPv4/IPv6) or '' (invalid)  local modip = require('Module:IP')  local s = input(frame)  local success, ip = pcall(modip.IPAddress.new, s)  if success then  return 'ip'  end  success, ip = pcall(modip.Subnet.new, s)  if success then  return 'range'  end  return '' end  return p