Which sector types are these numbers?

The DoomBuilder 2 Interface of sector types shows not all numbers, now which types link with missing numbers?
Missing:
6
18-20
26-70
79

It's exist a list of types for sectors AND linedefs for GZDoom/Doom Format?

For (G)ZDoom sector specials, see here. Since you're in Doom format, and it's not one of the four new specials, then see here instead.

You can also refer to this to see how Doom-format sector types are interpreted.

Anyway long story short, the reason these numbers are missing in DB2's interface is that they do not exist. Some ports may crash when encountering an unknown sector type (vanilla did), so there's no point in listing numbers that will either cause a crash or have no effect at all.

Thousand Thanks!