Code:
let
    TFR = Table.FromRecords({[IP = "192.168"]}),
    num1 = Table.AddColumn(TFR, "num1", each {0..255}),
    num2 = Table.AddColumn(num1, "num2", each {0..255}),
    Expand1 = Table.ExpandListColumn(num2, "num1"),
    Expand2 = Table.ExpandListColumn(Expand1, "num2"),
    TCC = Table.CombineColumns(Table.TransformColumnTypes(Expand2, {{"num1", type text}, {"num2", type text}}, "en-GB"),{"IP", "num1", "num2"},Combiner.CombineTextByDelimiter(".", QuoteStyle.None),"Result")
in
    TCC
Result
192.168.0.0
192.168.0.1
192.168.0.2
192.168.0.3
192.168.0.4
192.168.0.5
192.168.0.6
192.168.0.7
192.168.0.8
192.168.0.9
192.168.0.10
192.168.0.11
192.168.0.12
192.168.0.13
192.168.0.14
192.168.0.15
and so on
192.168.255.246
192.168.255.247
192.168.255.248
192.168.255.249
192.168.255.250
192.168.255.251
192.168.255.252
192.168.255.253
192.168.255.254
192.168.255.255