Exhibit 5

353 North clark Street Chicago IL 60654-3456  

March 27, 2017

Internap Corporation

One Ravinia Drive, Suite 1300

Atlanta, Georgia 30346

Re: Registration Statement on Form S-3

Ladies and Gentlemen:

We are acting as special counsel to Internap Corporation, a Delaware corporation (the “Company”), in connection with the preparation of a registration statement on Form S-3 (as amended or supplemented from time to time, the “Registration Statement”) to be filed with the Securities and Exchange Commission (the “Commission”) pursuant to the Securities Act of 1933, as amended (the “Securities Act”). The Registration Statement relates to the offering by certain stockholders of the Company (the “Selling Stockholders”) of 27,201,987 shares of the Company’s common stock, par value $0.001 per share (the “Shares”). All of the Shares are being registered on behalf of the Selling Stockholders.

We are acting as counsel for the Company in connection with the registration for resale of the Shares pursuant to the Securities Act. We have examined originals, or copies certified or otherwise identified to our satisfaction, of such documents, corporate records and other instruments as we have deemed necessary for the purposes of this opinion, including (a) the corporate and organizational documents of the Company, (b) certain minutes and records of the Company and (c) the Registration Statement and exhibits thereto.

For purposes of this opinion, we have assumed the authenticity of all documents submitted to us as originals, the conformity to the originals of all documents submitted to us as copies and the authenticity of the originals of all documents submitted to us as copies. We have also assumed the genuineness of the signatures of persons signing all documents in connection with which this opinion is rendered, the authority of such persons signing on behalf of the parties thereto other than the Company, and the due authorization, execution and delivery of all documents by the parties thereto other than the Company. As to any facts material to the opinions expressed herein which we have not independently established or verified, we have relied upon statements and representations of officers and other representatives of the Company and others. We have also made other assumptions which we believe to be appropriate for purposes of this letter.

Based upon and subject to the qualifications, assumptions and limitations set forth in this letter, we are of the opinion that as of the date hereof, the Shares have been duly authorized by all necessary corporate action of the Company, and are validly issued, fully paid and nonassessable.

Our opinions expressed above are subject to the qualifications that we express no opinion as to the applicability of, compliance with or effect of (a) any bankruptcy, insolvency, reorganization, fraudulent transfer, fraudulent conveyance, moratorium or other similar laws affecting the enforcement of creditors’ rights generally, (b) general principles of equity (regardless of whether enforcement is considered in a proceeding in equity or at law), (c) public policy considerations which may limit the rights of parties to obtain certain remedies and (d) other commonly recognized statutory and judicial constraints on enforceability, including, without limitation, statutes of limitations.

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Internap Corporation

March 27, 2017

Page 2

Our advice on every legal issue addressed in this letter is based exclusively on the General Corporation Law, constitution and reported judicial decisions of the State of Delaware and represents our opinion as to how that issue would be resolved were it to be considered by the highest court in the jurisdiction which enacted such law. The manner in which any particular issue would be treated in any actual court case would depend in part on facts and circumstances particular to the case and would also depend on how the court involved chose to exercise the wide discretionary authority generally available to it. This letter is not intended to guarantee the outcome of any legal dispute which may arise in the future. We advise you that issues addressed by this letter may be governed in whole or in part by other laws, but we express no opinion as to whether any relevant difference exists between the laws upon which our opinions are based and any other laws which may actually govern.

We do not find it necessary for the purposes of this opinion, and accordingly we do not purport to cover herein, the application of the securities or “Blue Sky” laws of the various states to the issuance or offer and sale of the Shares. We assume that the appropriate action will be taken, prior to the offer and sale of the Shares by the Selling Stockholders, to register and qualify the Shares for sale under all applicable state securities or “Blue Sky” laws.

This opinion is furnished to you in connection with the filing of the Registration Statement, and is not to be used, circulated, quoted or otherwise relied upon for any other purposes. This opinion is limited to the specific issues addressed herein, and no opinion may be inferred or implied beyond that expressly stated herein. We assume no obligation to revise or supplement this opinion should the present laws identified above be changed by legislative action, judicial decision or otherwise.

We hereby consent to the filing of this opinion as Exhibit 5 to the Registration Statement. We also consent to the reference to our firm under the heading “Legal Matters” in the Registration Statement. In giving this consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act or the rules and regulations of the Commission.

Very truly yours,

/s/ Jenner & Block LLP

JENNER & BLOCK LLP