QuickLinks -- Click here to rapidly navigate through this document

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

        We consent to the incorporation by reference in the Registration Statement (Post-Effective Amendment No. 2 on Form S-8 to Form S-4) of IAC/InterActiveCorp of our report dated March 11, 2005, with respect to the consolidated financial statements and schedule of IAC/InterActiveCorp, management's assessment of the effectiveness of internal control over financial reporting of IAC/InterActiveCorp, and the effectiveness of internal control over financial reporting of IAC/InterActiveCorp included in its Annual Report (Form 10-K) for the year ended December 31, 2004, filed with the Securities and Exchange Commission.

/s/ Ernst & Young LLP

New York, New York
August 8, 2005

QuickLinks

Consent of Independent Registered Public Accounting Firm