<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS OF MDU COMMUNICATIONS INTERNATIONAL,
INC. FOR THE QUARTER AND NINE MONTHS ENDED JUNE 30, 2000, AND IS QUALIFIED IT
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<S> <C> <C>
<PERIOD-TYPE> 3-MOS 9-MOS
<FISCAL-YEAR-END> SEP-30-2000 SEP-30-2000
<PERIOD-END> JUN-30-2000 JUN-30-2000
<CASH> 6,421,488 6,421,488
<SECURITIES> 0 0
<RECEIVABLES> 146,221 146,221
<ALLOWANCES> (22,000) (22,000)
<INVENTORY> 0 0
<CURRENT-ASSETS> 6,787,985 6,787,985
<PP&E> 5,912,990 5,912,990
<DEPRECIATION> (602,082) (602,082)
<TOTAL-ASSETS> 12,203,243 12,203,243
<CURRENT-LIABILITIES> 1,156,725 1,156,725
<BONDS> 0 0
0 0
8,679,973 8,679,973
<COMMON> 5,588,789 5,588,789
<OTHER-SE> (3,222,244) (3,222,244)
<TOTAL-LIABILITY-AND-EQUITY> 12,203,243 12,203,243
<SALES> 310,644 896,433
<TOTAL-REVENUES> 410,836 1,076,866
<CGS> 110,022 436,671
<TOTAL-COSTS> 2,318,888 10,699,029
<OTHER-EXPENSES> 0 11,502,222
<LOSS-PROVISION> 0 22,000
<INTEREST-EXPENSE> 2,602 52,845
<INCOME-PRETAX> (1,908,052) (9,622,163)
<INCOME-TAX> 0 0
<INCOME-CONTINUING> (1,908,052) (9,622,163)
<DISCONTINUED> 0 0
<EXTRAORDINARY> 0 0
<CHANGES> 0 0
<NET-INCOME> (1,908,052) (21,124,385)
<EPS-BASIC> (0.14) (1.71)
<EPS-DILUTED> (0.14) (1.71)
</TABLE>