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EXHIBIT 23.3
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 March 23, 1999, with respect to the
consolidated financial statements of I.I.T. Holding, Inc. and subsidiaries
included in the Annual Report (Form 10-K) of USinternetworking, Inc. for the
year ended December 31, 1999, filed with the Securities and Exchange Commission.
/s/ Ernst & Young LLP
Baltimore, Maryland
June 9, 2000
