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EXHIBIT 23.1
CONSENT OF INDEPENDENT AUDITORS
We consent to the reference to our firm under the caption "Experts" in the
Registration Statement (Form S-3, No. 333-93299) and related Prospectus of
USinternetworking, Inc. for the registration of $125,000,000 of 7% Convertible
Subordinated Notes, 7,545,272 shares of common stock issuable upon conversion of
the Notes and 133,372 shares of common stock, and to the incorporation by
reference therein of our report dated January 24, 2000, (except for Note 21, as
to which the date is March 3, 2000), with respect to the consolidated financial
statements of USinternetworking, Inc. included in its Annual Report (Form 10-K)
for the year ended December 31, 1999, filed with the Securities and Exchange
Commission.
/s/ Ernst & Young LLP
Baltimore, Maryland
June 9, 2000
