Six internet and web service stocks are moving up in their overall rating this week, according to the Portfolio Grader database. Every one of these is graded an “A” (“strong buy”) or “B” overall (“buy”).

This week, Commtouch Software Ltd (CTCH) is showing significant improvement as the company’s rating hops from a C (“hold”) to a B (“buy”). 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.

The rating of IntraLinks Holdings, Inc. (IL) moves up this week, rising from a C to a B. IntraLinks Holdings provides Software-as-a-Service solutions for managing content, exchanging business information and collaborating within and among organizations. For more information, get Portfolio Grader’s complete analysis of IL stock.

This week, Akamai Technologies, Inc. (AKAM) pushes up from a C to a B rating. 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.

This is a strong week for OpenTable, Inc. (OPEN). The company’s rating climbs to B from the previous week’s C. 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’s (DATE) ratings are looking better this week, moving up to a B from last week’s C. 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.