NtUnmapViewOfSectionEx
Other → NTSTATUS
NtUnmapViewOfSectionEx is a Windows NT kernel system call, in the Other category, returning NTSTATUS. Its syscall number is not the same on every Windows release: across the 40 version-and-architecture pairs recorded here it takes 19 distinct values, from 0x0014 to 0x01DF.
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 or between x64 and x86. The table below gives the value recorded for each.
Numbers across OS versions (40)
| OS Version | Architecture | Number |
|---|---|---|
| Windows 10 1507 | x86 | 0x0015 (21) |
| Windows 10 1507 | x64 | 0x01AF (431) |
| Windows 10 1511 | x86 | 0x0015 (21) |
| Windows 10 1511 | x64 | 0x01B2 (434) |
| Windows 10 1607 | x86 | 0x0015 (21) |
| Windows 10 1607 | x64 | 0x01B8 (440) |
| Windows 10 1703 | x86 | 0x0015 (21) |
| Windows 10 1703 | x64 | 0x01BE (446) |
| Windows 10 1709 | x64 | 0x01C2 (450) |
| Windows 10 1709 | x86 | 0x0015 (21) |
| Windows 10 1803 | x86 | 0x0015 (21) |
| Windows 10 1803 | x64 | 0x01C4 (452) |
| Windows 10 1809 | x64 | 0x01C5 (453) |
| Windows 10 1809 | x86 | 0x0015 (21) |
| Windows 10 1903 | x64 | 0x01C6 (454) |
| Windows 10 1903 | x86 | 0x0015 (21) |
| Windows 10 1909 | x86 | 0x0015 (21) |
| Windows 10 1909 | x64 | 0x01C6 (454) |
| Windows 10 2004 | x86 | 0x0015 (21) |
| Windows 10 2004 | x64 | 0x01CC (460) |
| Windows 10 20H2 | x64 | 0x01CC (460) |
| Windows 10 20H2 | x86 | 0x0015 (21) |
| Windows 10 21H1 | x64 | 0x01CC (460) |
| Windows 10 21H1 | x86 | 0x0015 (21) |
| Windows 10 21H2 | x64 | 0x01CE (462) |
| Windows 10 21H2 | x86 | 0x0015 (21) |
| Windows 10 22H2 | x86 | 0x0015 (21) |
| Windows 10 22H2 | x64 | 0x01CE (462) |
| Windows 11 and Server 11 21H2 | x64 | 0x01D8 (472) |
| Windows 11 and Server 11 22H2 | x64 | 0x01DC (476) |
| Windows 11 and Server 11 23H2 | x64 | 0x01DC (476) |
| Windows 11 and Server 11 24H2 | x64 | 0x01DF (479) |
| Windows 11 and Server 11 25H2 | x64 | 0x01DF (479) |
| Windows 11 and Server Server 2022 | x64 | 0x01D4 (468) |
| Windows 11 and Server Server 2025 | x64 | 0x01DF (479) |
| Windows 11 and Server Server 23H2 | x64 | 0x01DE (478) |
| Windows 8 8.0 | x86 | 0x0014 (20) |
| Windows 8 8.0 | x64 | 0x01A2 (418) |
| Windows 8 8.1 | x86 | 0x0014 (20) |
| Windows 8 8.1 | x64 | 0x01A7 (423) |