RObust Header Compression (ROHC) Profile Identifiers (original) (raw)

There appears to be further breakdown:

In the 8 LSBs, the range 0 to 127 is reserved for IETF standard-track specifications; the range 128 to 254 is available for other specifications that meet this requirement (such as Informational RFCs). The LSB value 255 is reserved for future extensibility of the present specification.