If you're going to do this more often you could record a macro with these steps. Highlight all of the IP addresses and copy. Sort Smallest to Largest Repeat for the 3rd column, then the 2nd, then the first. Start at the 4th column, click the drop-down menu. If you need longer numbers just add more zeros to the first replacement, and increase the 10 in the second replacement accordingly. Now line 1 will have a drop-down sort menu for each column. Once sorted the last expression will strip all leading zeros so you'll have your original numbers back. Those will sort in the order you want them to sort. Then, enter the number or numbers you want to use as a replacement in the Replace with field.

In the Replace dialog box, enter the number or numbers you want to replace in the Find what field. The second replacement than takes the last 10 digits of the number to bring everything back to the same length, giving you numbers like 0000000839, 0000000003 etc. To replace numbers in Notepad++, go to the Search menu and select the Replace option. It works by adding 10 zeros before the number, even though that's probably too much. Now, we might be interested in matching a small number of characters.

These are the steps (works for number up to 10 characters) Linux or any other platform ), Brackets ( Mac ), or Notepad ++ ( Windows ). Then they will sort correctly and you can use another replacement to strip the leading spaces/zeros afterwards. I don't know what your file looks like, but I'd use regular expressions to add spaces or zeros before each number to make them the same length (e.g.

Notepad++ sort by number