ABBREX

• 501. thepiratebay.se (2)
• 502. seattletimes.com (1)
• 503. sevenforums.com (1)
• 504. shadowstats.com (2)
• 505. forum.shrapnelgames.com (15)
• 506. skse.silverlock.org (1)
• 507. simplyshredded.com (2)
• 508. forums.sinsofasolarempire.com (1)
• 509. news.sky.com (1)
• 510. skyrimgems.com (15)
• 511. smartplanet.com (1)
• 512. smh.com.au (3)
• 513. www4.snapfish.com.au (1)
• 514. softvnn.com (3)
• 515. solarwinds.com (1)
• 516. sonyericsson.com (2)
• 517. soundcloud.com (2)
• 518. forums.spacebattles.com (1)
• 519. spacedaily.com (1)
• 520. spacepiratesandzombies.com (1)

You can click on a site to see its acronyms / abbreviations.
Numbers in parantheses show the number of acronyms / abbreviations for that site.