Module:IPAddress explained

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

function p._isIpV4Range(s) return p._isIpV4(s:gsub("/%d+$", "")) and (p._isIpOrRange(s)

'range')end

function p._isIpV6Range(s) return p._isIpV6(s:gsub("/%d+$", "")) and (p._isIpOrRange(s)

'range')end

function p._isIpOrRange(s) local modip = require('Module:IP') 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

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 delimiterend

function p.isIpV6(frame) return p._isIpV6(input(frame)) and "1" or "0" endfunction p.isIpV4(frame) return p._isIpV4(input(frame)) and "1" or "0" endfunction p.isIpV6Range(frame) return p._isIpV6Range(input(frame)) and "1" or "0" end function p.isIpV4Range(frame) return p._isIpV4Range(input(frame)) and "1" or "0" end function p.isIp(frame) return p._isIp(input(frame)) or "" end

function p.isIpOrRange(frame) -- → 'ip' (IPv4/IPv6) or 'range' (CIDR IPv4/IPv6) or (invalid) return p._isIpOrRange(input(frame))end

return p