The UBound function returns the upper limit for the number of elements in an array (the elements can be empty).
<% Dim katarray(5) %>
<% katarray(0) = "Mountain lion" %>
<% katarray(1) = "Bobcat" %>
<% katarray(2) = "Jaguar" %>
<% =UBound(katarray) %>
5
<% Dim arrayfish(4,6) %>
<% arrayfish(0,0) = "Neon tetra" %>
<% arrayfish(0,1) = "Angle fish" %>
<% arrayfish(0,2) = "Discus" %>
<% arrayfish(1,0) = "Golden dojo" %>
<% arrayfish(1,1) = "Clown loach" %>
<% arrayfish(1,2) = "Betta" %>
<% =UBound(arrayfish, 2) %>
6