The grades of six internet and web service stocks are on the rise this week on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

Commtouch Software Ltd’s (CTCH) grade is moving up to a B (“buy”) this week from last week’s C (“hold”). Commtouch Software provides messaging, antivirus, and Web security solutions to OEM customers, enterprises, and service providers primarily in Israel, North America, Europe, and Asia. In Portfolio Grader’s specific subcategory of Sales Growth, CTCH also gets an A. For more information, get Portfolio Grader’s complete analysis of CTCH stock.

IntraLinks Holdings, Inc. (IL) is seeing ratings go up from a C last week to a B this week. IntraLinks Holdings provides Software-as-a-Service solutions for managing content, exchanging business information and collaborating within and among organizations. Shares of the stock have been changing hands at an unusually rapid pace, three times the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of IL stock.

The rating of Akamai Technologies, Inc. (AKAM) moves up this week, rising from a C to a B. Akamai Technologies provides services for accelerating and improving the delivery of content and applications over the Internet. For more information, get Portfolio Grader’s complete analysis of AKAM stock.

OpenTable, Inc. (OPEN) boosts its rating from a C to a B this week. OpenTable provides free, real-time online restaurant reservations for diners through an online booking service. For more information, get Portfolio Grader’s complete analysis of OPEN stock.

Jiayuan.com International Ltd. Sponsored ADR (DATE) shows solid improvement this week. The company’s rating rises from a C to a B. Jiayuan. com International is an online Chinese dating company. For more information, get Portfolio Grader’s complete analysis of DATE stock.

Sohu.com, Inc. (SOHU) earns a B this week, jumping up from last week’s grade of C. Sohu.com is an Internet media company that serves as a daily source of information, communication and entertainment for millions of Chinese consumers. For more information, get Portfolio Grader’s complete analysis of SOHU stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.