Exhibit 31.1

CERTIFICATION UNDER SECTION 302

I, Shawn F. O’Donnell, certify that:

1. I have reviewed this Amendment No. 1 to the Quarterly Report on Form 10-Q of Arbinet Corporation; and

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.

Dated: October 12, 2010	/s/ Shawn F. O’Donnell
	Shawn F. O’Donnell
	President and Chief Executive Officer
	(Principal Executive Officer)