Mapping of SERVERNUM to ipcs shared memory value

Can anyone tell me how I can map a shared memory segment id (2nd column of ipcs -a on Solaris) for an instance to a SERVERNUM value? I was under the impression that SERVERNUM is the decimal equivalent of the hex ipcs value but this does not seem to be the case on my machine. The reason why I ask is that there seems to be some rogue segments floating about and I want to identify them properly, before removing them TIA Paul Matthews