Assuming you're running a "classic" init system such as System V it will be runlevel 5.
Since systemd is becoming far and far more prevalent, runlevels are becoming a thing of the past for lots of Linux distributions. What replaces them are more flexible and useful "target" units. They are nice in that units can simply declare that they want to be a part of a certain target. What more is that systemd will usually even run more than one target in the average boot! The "equivalent" target for 5 in systemd is usually graphical.target, and that's usually what default.target maps to.
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