What are Salesforce ID’s composed of?

The Id Field Type is a base-62 encoded string.

Each character can be one of 62 possible values:

  • a lowercase letter (a-z) – 26 values
  • an uppercase letter (A-Z) – 26 values
  • a numeric digit (0-9) – 10 values

As there is a combination of lower and upper case letters the casing of the 15 character Id has significance. E.g. 50130000000014 c is a different ID from 50130000000014C.

Within a 15 character Id the breakdown is:

  • First 3 characters – Key Prefix As per Jon’s answer, the first 3 characters are the key prefix that identify the object type. There are a few exceptions to this where multiple objects all share the same key prefix! There are a number of fixed key prefixes that are common across all of Salesforce. Custom objects get a unique key prefix per Org. Custom objects in managed packages can have a different key prefix in each installed org.
  • The 4th Character – instance/pod identifier
  • 5th Character – instance/pod identifier – extended
  • 6th character – Reserved. Will be 0 until such time that Salesforce has a need for it.
  • Remaining 9 characters – basically a really big number. Like 62^9 big or 238,328! That’s a lot of servers!

To this you can add an optional 3 character suffix that will make the Id unique case-insensitive. This is useful when working with programs that can’t maintain the case of the ID (E.g. Excel VLookup).

Need more help?

Hi there, was your problem or query resolved? If not & need more assistance, please do reach out to us at info@nanostuffs.com, we'll be more than delighted to help. Nanostuffs has 7+ years of extensive Salesforce & iOS/Android experience.
Holler Box