Ship Registration Number

The Ship Registration No. or ' REG' is a unique number given to each ship-of-the-line in the UNSC Navy. The number is used for administrative purposes and identification purposes, and differs from the HCS in that it represents both the ship and its crew.

The format for a ship registration is 6 digits ranging from 1 to 0, followed by a decimal, then three further digits (generally '000' unless a registration is shared or under other unique circumstances), then finally an underscore followed by a letter. For example, 123456.000_A is a correct ship registration.