Roblox ID

The Roblox ID, (also known simply as ID) is a source of when players, groups, assets or items were created in relation to other items. The ID number can be seen at the URL on a player, group, asset or item page.

ID swapping
During the early days of Roblox, some players were ID swapped for unknown reasons. A well known case of this is the ID swap between Shedletsky and Telamon. Prior to the username change feature being released, Shedletsky announced that he ID swapped both Telamon and Shedletsky due to him outgrowing his previous username.

Trivia

 * Players can calculate ID's by if an ID in numbers is longer than smaller ID's, that mean that the item, user, group or asset has been on Roblox for a smaller duration of time then the smaller ID.