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I cant vouch for wether this is a common format .. but it is used in Microsoft Sharepoint's databases.
8-4-4-4-12
Turns out that the 8-4-4-4-12 is a completely standard thing …. a UUID …
https://en.wikipedia.org/wiki/Universally_unique_identifier
In its canonical textual representation, the sixteen octets of a UUID are represented as 32 hexadecimal (base 16) digits, displayed in five groups separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters (32 alphanumeric characters and four hyphens). For example:
123e4567-e89b-12d3-a456-426655440000
xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx
The four bits of digit M indicate the UUID version, and the one to three most significant bits of digit N indicate the UUID variant. In the example, M is 1 and N is a (10xx), meaning that the UUID is a variant 1, version 1 UUID; that is, a time-based DCE/RFC 4122 UUID.
The canonical 8-4-4-4-12 format string is based on the "record layout" for the 16 bytes of the UUID