OSPF LSA sequence numbers

[nknarang (Naresh N)]

Hi Rene,
You mentioned:

“What do the sequence numbers look like for OSPF LSAs?
There are 4 bytes or 32-bits.
Begins with 0x80000001 and ends at 0x7FFFFFFF.”

Why does sequence number ends at a 31 bit number 0x7FFFFFFF not 32 bit number at 0xFFFFFFFF?

Thanks,
Naresh