Exhibit 99.1

Ixia Announces Record Revenue of $70.9 Million for Third Quarter of 2010
Significant Sequential Increase in Operating Income and Earnings

CALABASAS, Calif., October 21, 2010 — Ixia (Nasdaq:XXIA) today reported its financial results for the third quarter ended September 30, 2010.

Total revenue for the 2010 third quarter was a record $70.9 million, an increase of 53 percent over the $46.4 million reported for the 2009 third quarter and an increase of 7 percent over the $66.1 million reported in the immediately preceding quarter. Revenue for the 2010 third quarter includes approximately $21.8 million attributable to sales of our IxN2X and IxCatapult products following the acquisition of Agilent Technologies’ N2X Data Network Testing Product Line in October 2009 and the acquisition of Catapult Communications in June 2009. Revenue for the 2009 third quarter included approximately $7.5 million attributable to sales of our IxCatapult products.

On a GAAP basis, the company recorded net income for the 2010 third quarter of $4.9 million, or $0.07 per diluted share, compared with a net loss of $6.2 million, or $0.10 per share, for the 2009 third quarter.

Non-GAAP net income for the 2010 third quarter was $9.8 million, or $0.14 per diluted share, compared with non-GAAP net income of $1.5 million, or $0.02 per diluted share, reported in the third quarter of the prior year.

“Continued momentum across our key product lines and increased demand in Europe and Asia resulted in our third sequential quarter of record revenue,” commented Atul Bhatnagar, Ixia’s president and chief executive officer. “Our strong revenue performance coupled with continued execution of our strategy and strong operating expense discipline resulted in solid bottom-line results, including significant increases in both our operating income and earnings per share.

“Building on our award winning suite of Ethernet products,” continued Mr. Bhatnagar, “last week we announced our new Xcellon^TM family of 10 Gigabit products that utilizes next-generation testing architecture and for the first time ever breaks the terabit traffic generation barrier. Xcellon is designed to fully support data center convergence and cloud-computing paradigms that are changing the dynamics of business computing. It leverages cutting-edge multi-core processors, hardware encryption coprocessors, and high test port density to generate realistic media-rich application traffic on the extreme scale required for next-generation networks.”

In the 2010 third quarter, cash, cash equivalents and investments in the aggregate increased by nearly $18 million over the 2010 second quarter to $121 million due in part to the $14.5 million

of net cash provided by operating activities. As of September 30, 2010, the company had no debt.

Ixia’s non-GAAP 2010 third quarter results exclude $3.0 million related to stock-based compensation expenses, $0.3 million for acquisition-related and restructuring costs, $3.5 million for the amortization of acquired intangible assets and a net tax benefit of $2.0 million related to (i) the items above and (ii) changes in the valuation allowance related to the company’s deferred tax assets. Ixia’s non-GAAP 2009 third quarter results exclude charges of $1.6 million related to stock-based compensation, $880,000 for acquisition-related costs, $3.8 million for the amortization of acquired intangible assets, $2.5 million related to restructuring expenses, $1.0 million for certain inventory write-downs and $1.4 million related to the impairment of certain investments, and a net tax benefit of $3.4 million related to these items.

Ixia will host a conference call today, at 5:00 p.m., Eastern Time, for analysts and investors to discuss its 2010 third quarter results and its business outlook for the 2010 fourth quarter. Open to the public, investors may access the call by dialing (678) 825-8347. A live webcast of the conference call, along with supplemental financial information, will be accessible from the “Investors” section of Ixia’s web site (www.ixiacom.com). Following the live webcast, an archived version will be available in the “Investors” section on the Ixia web site for 90 days.

Non-GAAP Information

To supplement our consolidated financial results prepared in accordance with Generally Accepted Accounting Principles (“GAAP”), we have included certain non-GAAP financial measures in this press release and in the attachments hereto. Specifically, we have provided non-GAAP financial measures (e.g., non-GAAP cost of revenues, non-GAAP operating expenses, non-GAAP operating income, non-GAAP interest and other income, net, non-GAAP income tax expense, non-GAAP net income, and non-GAAP diluted earnings per share) that exclude certain non-cash and/or non-recurring income and expense items such as proceeds from legal settlement, stock-based compensation expenses, acquisition and other related costs, the amortization of acquisition-related intangible assets, restructuring expenses, certain inventory adjustments, the impairment charges related to certain investments, and the related income tax effects of these items, as well as the income tax impacts of valuation allowances recorded against certain deferred tax assets. The aforementioned items represent income and expense items that may be difficult to estimate from period to period and that are not directly attributable to the underlying performance of our business operations. These non-GAAP financial measures are provided to enhance the user’s overall understanding of our financial performance. We believe that by excluding these items, as well as the related income tax effects, our non-GAAP measures provide supplemental information to both management and investors that is useful in assessing our core operating performance, in evaluating our ongoing business operations and in comparing our results of operations on a consistent basis from period to period. These non-GAAP financial measures are also used by management to plan and forecast future periods and to assist in making operating and strategic decisions. The presentation of this additional information is not prepared in accordance with GAAP. The information therefore may not necessarily be comparable to that of other companies and should be considered as a supplement to, not a substitute for, or superior to, the corresponding measures calculated in accordance with GAAP.

Investors are encouraged to review the reconciliations of GAAP to non-GAAP financial measures which are included below in this press release.

About Ixia

Ixia is a leading provider of converged IP performance test systems and service verification platforms for wireless and wired infrastructures and services. Ixia’s test systems are used by network and telephony equipment manufacturers, semiconductor manufacturers, service providers, governments and enterprises to validate the performance and reliability of complex networks, devices and applications. Ixia’s multiplay test systems address the growing need to test voice, video and data services and network capability under real-world conditions.

For more information, contact Ixia at 26601 W. Agoura Road, Calabasas, CA 91302; (818) 871-1800, Fax: (818) 871-1805; Email: info@ixiacom.com or visit our Web Site at http://www.ixiacom.com. Ixia, the Ixia four-petal logo and Xcellon are registered trademarks or trademarks of Ixia.

Safe Harbor Under the Private Securities Litigation Reform Act of 1995:

Certain statements made in this press release are forward-looking statements, including, without limitation, statements regarding possible future revenues, cost savings, growth and profitability and future business and market share. In some cases, such forward looking statements can be identified by terms such as “may,” “will,” “should,” “could,” “would,” “expect,” “plan,” “anticipate,” “believe,” “estimate,” “project,” “predict,” “potential,” and variations of these words and similar expressions are intended to identify forward-looking statements. These statements reflect our current views with respect to future events and are based on assumptions and are subject to risks and uncertainties. These risks, uncertainties and other factors may cause our future results, performances or achievements to be materially different from those expressed or implied by our forward-looking statements and include, among other things: the current global economy, our success with the integration of our 2009 acquisitions of Catapult and Agilent Technologies’ N2X Data Network Testing Product Line, competition, our ability to successfully defend any claims from taxing authorities in the various countries where we conduct business, consistency of orders from significant customers, our success in developing and producing new products, market acceptance of our products and our ability to realize all of the expected benefits of our restructuring plan. The factors that may cause future results to differ materially from our current expectations also include, without limitation, the risks identified in our Annual Report on Form 10-K for the year ended December 31, 2009, and in our other filings with the Securities and Exchange Commission. Many of these risks and uncertainties are outside of our control and are difficult for us to forecast or mitigate. We undertake no obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise.

Financial Contact:
The Blueshirt Group
Investor Relations
Chris Danne or Maria Riley 415-217-7722
or
Tom Miller, Chief Financial Officer
Dir: 818-444-2325
tmiller@ixiacom.com

IXIA
Condensed Consolidated Balance Sheets
(in thousands)
(unaudited)

		September 30,				December 31,
		2010				2009
Assets
Current assets:
Cash and cash equivalents		$	42,691			$	15,061
Short-term investments in marketable securities			40,379				10,337
Accounts receivable, net			65,843				55,765
Inventories			23,659				14,541
Prepaid expenses and other current assets			9,232				9,727
Total current assets			181,804				105,431
Investments in marketable securities			37,493				53,582
Property and equipment, net			22,372				18,693
Intangible assets, net			56,481				69,132
Goodwill			60,121				60,121
Other assets			2,232				2,129
Total assets		$	360,503			$	309,088
Liabilities and Shareholders’ Equity
Current liabilities:
Accounts payable		$	11,776			$	6,136
Accrued expenses			31,221				21,253
Deferred revenues			34,488				29,842
Income taxes payable			1,090				1,263
Total current liabilities			78,575				58,494
Deferred revenues			7,206				7,309
Other liabilities			6,654				6,620
Total liabilities			92,435				72,423
Shareholders’ equity:
Common stock, without par value; 200,000 shares authorized at September 30, 2010 and December 31, 2009; 66,061 and 63,062 shares issued and outstanding as of September 30, 2010 and December 31, 2009, respectively			103,940				87,283
Additional paid-in capital			127,634				118,754
Retained earnings			34,361				28,979
Accumulated other comprehensive income			2,133				1,649
Total shareholders’ equity			268,068				236,665
Total liabilities and shareholders’ equity		$	360,503			$	309,088

IXIA
Condensed Consolidated Statements of Operations
(in thousands, except per share data)
(unaudited)

		Three months ended								Nine months ended
		September 30,								September 30,
		2010				2009				2010				2009
Revenues:
Products		$	58,540			$	37,076			$	164,134			$	97,598
Services			12,350				9,298				34,901				24,305
Total revenues			70,890				46,374				199,035				121,903
Costs and operating expenses:(1)
Cost of revenues — products			14,231				10,461				39,449				25,971
Cost of revenues — services			1,535				823				4,561				2,567
Research and development			17,802				13,692				54,323				37,001
Sales and marketing			19,665				15,233				57,986				42,990
General and administrative			8,443				7,359				25,667				20,097
Amortization of intangible assets(2)			3,532				3,774				13,676				6,485
Acquisition and other related			312				880				2,991				3,402
Restructuring			30				2,527				3,587				3,538
Total costs and operating expenses			65,550				54,749				202,240				142,051
Income (loss) from operations			5,340				(8,375	)			(3,205	)			(20,148	)
Interest and other income, net(2)			578				343				9,674				1,572
Other-than-temporary impairment on investments			—				(1,356	)			—				(2,761	)
Income (loss) before income taxes			5,918				(9,388	)			6,469				(21,337	)
Income tax expense (benefit)			1,044				(3,165	)			1,087				(8,469	)
Net income (loss)		$	4,874			$	(6,223	)		$	5,382			$	(12,868	)
Earnings (loss) per share:
Basic		$	0.07			$	(0.10	)		$	0.08			$	(0.21	)
Diluted		$	0.07			$	(0.10	)		$	0.08			$	(0.21	)
Weighted average number of common and common equivalent shares outstanding:
Basic			65,513				62,551				64,388				62,649
Diluted			68,018				62,551				66,341				62,649

(1)      Stock-based compensation included in:
Cost of revenues — products		$	115			$	76			$	371			$	339
Cost of revenues — services			44				29				140				129
Research and development			1,191				596				3,748				3,259
Sales and marketing			772				271				2,503				2,332
General and administrative			916				626				2,468				1,986

(2)

The three months ended September 30, 2010 included out-of-period adjustments attributable to the three months ended June 30, 2010, which decreased non-cash amortization of intangible assets by $333,000 and increased interest and other income, net by $267,000.

IXIA
Non-GAAP Information and Reconciliation to Comparable GAAP Financial Measures
(in thousands, except percentages and per share data)
(unaudited)

		Three months ended September 30,
		2010								2009
						% Total								% Total
		Amount ($)				Revenues				Amount ($)				Revenues
Total cost of revenues — GAAP		$	15,766				22.2	%		$	11,284				24.3	%
Inventory write-down and adjustments(a)			—				—	%			(1,012	)			-2.2	%
Stock-based compensation(b)			(159	)			-0.2	%			(105	)			-0.2	%
Total cost of revenues — Non-GAAP		$	15,607				22.0	%		$	10,167				21.9	%
Operating expenses — GAAP		$	49,784				70.2	%		$	43,465				93.7	%
Amortization of intangible assets(c)			(3,532	)			-5.0	%			(3,774	)			-8.1	%
Acquisition and other related(d)			(312	)			-0.4	%			(880	)			-1.9	%
Restructuring(e)			(30	)			-0.0	%			(2,527	)			-5.4	%
Stock-based compensation(b)			(2,879	)			-4.1	%			(1,493	)			-3.3	%
Operating expenses — Non-GAAP		$	43,031				60.7	%		$	34,791				75.0	%
Income (loss) from operations — GAAP		$	5,340				7.5	%		$	(8,375	)			-18.1	%
Effect of reconciling items(f)			6,912				9.8	%			9,791				21.2	%
Income from operations — Non-GAAP		$	12,252				17.3	%		$	1,416				3.1	%
Other-than-temporary impairment on investments — GAAP		$	—				—	%		$	(1,356	)			-2.9	%
Effect of reconciling items(g)			—				—	%			1,356				2.9	%
Other-than-temporary impairment on investments — Non-GAAP		$	—				—	%		$	—				—	%
Income tax expense (benefit) — GAAP		$	1,044				1.5	%		$	(3,165	)			-6.8	%
Effect of reconciling items(h)			1,998				2.8	%			3,379				7.3	%
Income tax expense — Non-GAAP		$	3,042				4.3	%		$	214				0.5	%
Net income (loss) — GAAP		$	4,874				6.9	%		$	(6,223	)			-13.4	%
Effect of reconciling items(i)			4,914				6.9	%			7,768				16.7	%
Net income — Non-GAAP		$	9,788				13.8	%		$	1,545				3.3	%
Basic earnings (loss) per share — GAAP		$	0.07							$	(0.10	)
Effect of reconciling items(j)			0.07								0.12
Diluted earnings per share — Non-GAAP		$	0.14							$	0.02

IXIA
Non-GAAP Information and Reconciliation to Comparable GAAP Financial Measures
(in thousands, except percentages and per share data)
(unaudited)

		Nine months ended September 30,
		2010								2009
						% Total								% Total
		Amount ($)				Revenues				Amount ($)				Revenues
Total cost of revenues — GAAP		$	44,010				22.1	%		$	28,538				23.4	%
Inventory write down(a)			—				—	%			(1,785	)			-1.5	%
Stock-based compensation(b)			(511	)			-0.2	%			(468	)			-0.3	%
Total cost of revenues — Non-GAAP		$	43,499				21.9	%		$	26,285				21.6	%
Operating expenses — GAAP		$	158,230				79.5	%		$	113,513				93.1	%
Amortization of intangible assets(c)			(13,676	)			-6.9	%			(6,485	)			-5.3	%
Acquisition and other related(d)			(2,991	)			-1.5	%			(3,402	)			-2.8	%
Restructuring(e)			(3,587	)			-1.8	%			(3,538	)			-2.9	%
Stock-based compensation(b)			(8,719	)			-4.4	%			(7,577	)			-6.2	%
Operating expenses — Non-GAAP		$	129,257				64.9	%		$	92,511				75.9	%
Loss from operations — GAAP		$	(3,205	)			-1.6	%		$	(20,148	)			-16.5	%
Effect of reconciling items(f)			29,484				14.8	%			23,255				19.0	%
Income from operations — Non-GAAP		$	26,279				13.2	%		$	3,107				2.5	%
Interest and other income, net — GAAP		$	9,674				4.9	%		$	1,572				1.3	%
Settlement proceeds(g)			(8,925	)			-4.5	%			—				—	%
Interest and other income, net — Non-GAAP		$	749				0.4	%		$	1,572				1.3	%
Other-than-temporary impairment on investments — GAAP		$	—				—	%		$	(2,761	)			-2.3	%
Effect of reconciling items(h)			—				—	%			2,761				2.3	%
Other-than-temporary impairment on investments — Non-GAAP		$	—				—	%		$	—				—	%
Income tax expense (benefit) — GAAP		$	1,087				0.5	%		$	(8,469	)			-6.9	%
Effect of reconciling items(i)			6,016				3.1	%			9,211				7.5	%
Income tax expense — Non-GAAP		$	7,103				3.6	%		$	742				0.6	%
Net income (loss)— GAAP		$	5,382				2.7	%		$	(12,868	)			-10.6	%
Effect of reconciling items(j)			14,543				7.3	%			16,805				13.8	%
Net income — Non-GAAP		$	19,925				10.0	%		$	3,937				3.2	%
Diluted earnings (loss) per share — GAAP		$	0.08							$	(0.21	)
Effect of reconciling items(k)			0.22								0.27
Diluted earnings per share — Non-GAAP		$	0.30							$	0.06