Error Type:Microsoft VBScript runtime (0x800A0009) Subscript out of range: '5'

There are more records in table than 4.
You have defined arraysize as 4

Dim intContactId(4)
Dim intAddressId(4)

Quickfix...Just increase the array size to say 100 .

Or redim preserve intContactId(TotalNoofrecords)  

You can try this:

Dim i
Dim j
Dim intContactId
Dim intAddressId

strStudentContact = "exec ssrSP_GetStudentContact '" & strKISDID & "'"
set rsStudentContact = ExecSQLRS(strStudentContact)
if not rsStudentContact.EOF then
     do while not rsStudentContact.EOF
         
          intContactId= rsStudentContact.Fields("ContactId") & ","
          strContact = "exec ssrSP_GetContact '" & intContactId(i) & "'"
          set rsContact = ExecSQLRS(strContact)
          if not rsContact.EOF then
           
               do while not rsContact.EOF
                    intAddressId= rsContact.Fields("AddressId") & ","
               Loop
          end if
          set rsContact = nothing
         
     Loop
end if    
rsStudentContact = nothing

intContactId = split(intContactId, ",")  '<-------create array with all data
intAddressId = split(intAddressId, ",") '<-------create array with all data

for i = 0 to ubound(intContactId)
    Response.write "Contact: " & intContactId  & "<br>"
next
for i = 0 to ubound(intAddressId)
    Response.write "Addresst: " & intAddressId & "<br>"
next

However, what yu're doing do not look like a good idea.  There will be no way to match up your Contact ID  with the right AddressID because your building array inside a loop and then another array inside that loop.

So arrau intContactId(1) may contain ID# 10, and array intAddressId(1) may contain ID's 1-10.  Then the next would be higher.  Maybe I'm missing something, but there's no point in that!

May want to use INNER JOIN query instead of SP.

Do you still need assistance with this question?   If not, please close...

Thanks.