The JES2 Init & Tuna reference notes this in the description of the RANGE 
initialization statement: 

RANGE=nnnnn[,mmmmm]|1,9999
Specifies the range of numbers (1 through 999999) which JES2 will assign as 
JOBIDs to jobs which originated on the local node. 
The integer n specifies the lowest number (1 through 999999) which will be 
assigned as a JES2 job identifier for jobs originating locally.

The integer m specifies the highest number (n+10 through 999999) which will be 
assigned as a JES2 job identifier to jobs originating locally. Note that 
setting the upper limit above 99,999 will cause the JOBID format to change from 
CCCNNNNN to C0NNNNNN where CCC is either JOB, STC, or TSU, and C is J, S, or T. 
  NNNNN or NNNNNN is a number.

https://www.ibm.com/support/knowledgecenter/SSLTBW_2.1.0/com.ibm.zos.v2r1.hasa400/has2u600110.htm

Greg Shirey
Ben E. Keith Company 

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf 
Of Charles Mills
Sent: Wednesday, June 15, 2016 4:13 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Where is format of Job ID documented?

Thanks. Supports the idea of only three possible prefixes.

Charles

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