To be precise, as of z/OS 2.1, there are up to 2048 valid record types (0-2047). A value of 126 (decimal) at offset +5 into an SMF record is one (of many) indicators that the record contains an extended header where the actual record type field resides. The chapter titled "SMF record general information and best practices" contains sections describing the SMF standard and extended headers and record types. https://www-40.ibm.com/servers/resourcelink/svc00100.nsf/pages/zOSV2R5sa380667/$file/ieag200_v2r5.pdf
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