<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE AUDITED
FINANCIAL STATEMENT AS OF SEPTEMBER 30, 1999, AND THE UNAUDITED CONSOLIDATED
FINANCIAL STATEMENTS AS OF MARCH 31, 2000, OF MDU COMMUNICATIONS INTERNATIONAL,
INC. AND IS QUALIFIED IT ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<S> <C> <C>
<PERIOD-TYPE> YEAR 6-MOS
<FISCAL-YEAR-END> SEP-30-1999 MAR-31-2000
<PERIOD-END> SEP-30-1999 MAR-31-2000
<CASH> 43,621 9,122,224
<SECURITIES> 0 0
<RECEIVABLES> 178,607 197,696
<ALLOWANCES> 0 (20,000)
<INVENTORY> 0 0
<CURRENT-ASSETS> 317,482 9,517,775
<PP&E> 3,729,286 4,668,292
<DEPRECIATION> (172,900) (428,006)
<TOTAL-ASSETS> 4,000,578 13,869,864
<CURRENT-LIABILITIES> 2,621,892 915,294
<BONDS> 0 0
0 0
0 8,679,973
<COMMON> 1,559,720 5,588,789
<OTHER-SE> (181,034) (1,314,192)
<TOTAL-LIABILITY-AND-EQUITY> 4,000,578 13,869,864
<SALES> 566,698 585,789
<TOTAL-REVENUES> 566,698 666,030
<CGS> 339,570 326,649
<TOTAL-COSTS> 3,092,358 8,380,141
<OTHER-EXPENSES> 0 0
<LOSS-PROVISION> 0 0
<INTEREST-EXPENSE> 32,321 50,243
<INCOME-PRETAX> (2,525,660) 7,714,111
<INCOME-TAX> 0 0
<INCOME-CONTINUING> (2,525,660) 7,714,111
<DISCONTINUED> 0 0
<EXTRAORDINARY> 0 0
<CHANGES> 0 0
<NET-INCOME> (2,525,660) 7,714,111
<EPS-BASIC> (.28) (2.05)
<EPS-DILUTED> (.28) (2.05)
</TABLE>