# Historian Quality code 1073742080 - What is it?

**URL:** <https://forum.inductiveautomation.com/t/historian-quality-code-1073742080-what-is-it/102279>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [February 12, 2025, 10:01pm UTC](https://forum.inductiveautomation.com/t/historian-quality-code-1073742080-what-is-it/102279 "2025-02-12T22:01:12Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![FrankP](https://avatars.discourse-cdn.com/v4/letter/f/34f0e0/32.png) [@FrankP](https://forum.inductiveautomation.com/u/FrankP)\
**Post date:** [February 12, 2025, 10:01pm UTC](https://forum.inductiveautomation.com/t/historian-quality-code-1073742080-what-is-it/102279/1 "2025-02-12T22:01:12Z")

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When history values are requested for intervals in the future, an undocumented quality code is shown. (At least, I can't find documentation of it)

Does anyone else get the same code?

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/d/d/dd9f154a97cca6a973df7d1fdee4e690c2846ded.png)

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<div class="post-metadata">

**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [February 12, 2025, 10:16pm UTC](https://forum.inductiveautomation.com/t/historian-quality-code-1073742080-what-is-it/102279/2 "2025-02-12T22:16:46Z")

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I think it's just `Uncertain` with no additional sub-code or info.

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<div class="post-metadata">

**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [February 12, 2025, 10:20pm UTC](https://forum.inductiveautomation.com/t/historian-quality-code-1073742080-what-is-it/102279/3 "2025-02-12T22:20:26Z")

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It is 0x40000100. So, "uncertain" with subcode 256. Sounds familiar, but I don't recall from where. /:

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<div class="post-metadata">

**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [February 12, 2025, 10:25pm UTC](https://forum.inductiveautomation.com/t/historian-quality-code-1073742080-what-is-it/102279/4 "2025-02-12T22:25:02Z")

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Yeah, 256 is the code for Uncertain, and the high bits are the Uncertain severity.

It's Uncertain/Uncertain.

```java
/**
 * An unspecified degree of uncertainty exists in this value. Good luck!
 */
public static final QualityCode Uncertain = q(Level.Uncertain.code(256));

```

lol