# hfiref0x/SyscallTables

Windows NT Syscall tables

Repository: https://github.com/hfiref0x/SyscallTables
Canonical: https://ross.abutalabs.com/products/syscalltables
Language: C
License: BSD-2-Clause
License Family: permissive
Topics: syscall-table, win64, win32k, ssdt
Last push: 2026-07-04T14:37:43+00:00

## Health v2 (maintenance only)
Score: 63/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 90, release rhythm 8, longevity 100
- inputs: {"age_days": 3820, "days_push": 60, "days_rel": 417, "gap_med": null, "n_releases_24m": 1}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1465, forks 273 (observed 2026-08-28T04:04:48.261301+00:00)

## What it is
A collection of combined Windows NT syscall tables covering ntoskrnl and win32k service tables across Windows versions from XP x64 through Windows 11 builds. It provides reference data (in C and browsable HTML) mapping syscall numbers for x86-64 Windows kernels.

## Use cases
- look up syscall numbers for a specific Windows 10 or 11 build
- build a Windows kernel research or hooking tool that needs SSDT indexes
- resolve win32k syscall IDs when writing security research tooling
- compare syscall tables across Windows versions
- find the syscall number for an Nt function on Windows Server 2022

## When to choose
- you need authoritative syscall number mappings for x86-64 Windows kernels
- you are doing kernel-mode security research, rootkit analysis, or EDR development on Windows
- you want precomputed tables instead of extracting them from ntoskrnl/win32k binaries yourself

## When to avoid
- you need 32-bit (x86) syscall tables
- you target non-Windows operating systems
- you need a runtime syscall-resolution library rather than static reference tables

## Facets
- artifact type: dataset
- maturity: active
- function: security, reverse-engineering, developer-tools
- domain: operating-systems, security, reverse-engineering, windows
- platform: windows, cpp
- tags: syscall-table, ssdt, win32k, ntoskrnl, win64, windows-internals, reference-data

## Member repositories
- hfiref0x/SyscallTables (main) score 63

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:48.261301+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:35:05.832540+00:00, confidence not recorded.
  - readme: https://github.com/hfiref0x/SyscallTables (fetched 2026-08-28T04:04:48.261301+00:00, sha 762d2762f7dd)
- Data as of 2026-08-30T08:39:29.467469+00:00.