example.lua

local ipaddr = require('ipaddr')
local insert = table.insert
local sort = table.sort

local function compare_networks(a, b)
    return a < b
end

local ipranges = {}

lines = {
    "1.0.0.0/24",
    "1.0.4.0/22",
}
for i=1, #lines do
    local range = ipaddr:new(lines[i]:match('^%s*(%d+)%.(%d+)%.(%d+)%.(%d+)/(%d+)%s*$'))
    if range then
        insert(ipranges, range)
    end
end
sort(ipranges, compare_networks)

local test = '1.0.0.1'
ip = ipaddr:new(test:match('^%s*(%d+)%.(%d+)%.(%d+)%.(%d+)'))
print(ip.netmask, ip.network, ip.broadcast, ip.str(ip))
for _, r in ipairs(ipranges) do
    if r<ip and r:contains(ip) then
        print(r.network, ip.network, r.broadcast)
    else
        print(false)
    end
end