NtQueryIoRingCapabilities

Query → NTSTATUS

NtQueryIoRingCapabilities is a Windows NT kernel system call, in the Query category, returning NTSTATUS. Its syscall number is not the same on every Windows release: across the 7 version-and-architecture pairs recorded here it takes 4 distinct values, from 0x015A to 0x015F.

The number is an index into the system service table of one particular build, not a stable identifier, so it is not portable between Windows versions. The table below gives the value recorded for each.