🆔CSteamID

Understanding Steam's Unique ID

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Introduction

CSteamID also known simply as "Steam ID" is a ulong value (64 bits) and is used by Steam API to uniquely identify ... well most things.

The native CSteamID ulong value is composed of 4 main parts

Universe

namespace Steamworks
{
    public enum EUniverse
    {
        k_EUniverseInvalid = 0,
        k_EUniversePublic = 1,
        k_EUniverseBeta = 2,
        k_EUniverseInternal = 3,
        k_EUniverseDev = 4,
        k_EUniverseMax = 5
    }
}

Type

namespace Steamworks
{
    public enum EAccountType
    {
        k_EAccountTypeInvalid = 0,
        k_EAccountTypeIndividual = 1,
        k_EAccountTypeMultiseat = 2,
        k_EAccountTypeGameServer = 3,
        k_EAccountTypeAnonGameServer = 4,
        k_EAccountTypePending = 5,
        k_EAccountTypeContentServer = 6,
        k_EAccountTypeClan = 7,
        k_EAccountTypeChat = 8,
        k_EAccountTypeConsoleUser = 9,
        k_EAccountTypeAnonUser = 10,
        k_EAccountTypeMax = 11
    }
}

Account Id

AccountId_t accountId;

The data type AccountId_t is a wrapper around the uint primitive type ... that is it is a uint value with a few extra features.

Account Instance

uint unAccountInstance;

This value is readable on the CSteamID but not documented in Steam.

We know from reviewing the CSteamID struct and its various methods that for Type Clan and GameServer the account instance is set to

unAccountInstance = 0u;