---
title: "check per-apex slots · RUAL Documentation"
description: "Report which per-apex slots a group member has filled, which it will never need, and which nobody has answered for."
canonical: https://docs.rual.nl/block-types/dns/dnszone_slot_status
language: en
---

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# check per-apex slots

This block is part of the [`dns`](https://docs.rual.nl/block-types/dns) group and was last modified in core [`v15.0.0`](https://docs.rual.nl/core-versions/150000).

Report which per-apex slots a group member has filled, which it will never need, and which nobody has answered for.

- flow `flow`

- Base records required `array` The group's record set, as the store holds it.

- Member zone `value` The apex being checked, for example deverence.nl.

- Rules `array` The group's policy. Only the per-apex entries matter here.

- Own records `array` This member's own records, each carrying the slot it fills.

- Slots not applicable `object` Slot name to the reason this domain will never fill it.

- flow `flow`

- Success `condition` True when the slots could be evaluated.

- Member zone `value` The apex that was checked.

- Slots `array` Each slot with its state, why it exists, and either what filled it or why it never will be.

- Unfilled slots `array` Slots nobody has answered for.

- Count `number` How many slots this group has.

- Complete `condition` True when every slot is filled or explained.

- Error `value` Why the slots could not be evaluated.

Reports the per-apex slot state for ONE group member without rendering anything, for a zone overview that has to show gaps before anyone renders. A slot is a record bound to one domain by something outside DNS : an ACM validation CNAME, a DKIM key, a verification token : which each apex must supply from its own records. Every slot comes back in one of exactly three states: 'filled' (an override carries it), 'not-applicable' (slots_na records the reason this domain will never have one, for example it sends no mail) or 'empty' (nobody has looked). Empty and not-applicable are deliberately NOT the same state: a zone with an empty slot is unfinished and must not be pushed, which is what complete=false and the unfilled list are for. Reads the same base_records, rules and overrides as dnszone_render_member and agrees with it by construction.

| `slot gaps` |
| --- |
| `zone slots` |

A typical wiring for [check per-apex slots](https://docs.rual.nl/block-types/dns/dnszone_slot_status): a [function trigger](https://docs.rual.nl/block-types/globals/trigger_custom_function) starts the flow; [with values](https://docs.rual.nl/block-types/array/array_of_values) feeds the `base_records` pin; the `flow` out pin feeds [debug](https://docs.rual.nl/block-types/state%2520ui/state_debug).

[![Studio canvas example for the check per-apex slots block: typical wiring for check per-apex slots.](https://docs.rual.nl/canvas-examples/dnszone_slot_status.png)](https://docs.rual.nl/canvas-examples/dnszone_slot_status.png?v=3)

## Used in these guides

These documentation pages use or explain this block:

- [DNS Zone Blocks](https://docs.rual.nl/reference/dns-blocks)

## Version history

Introduced in [`v15.0.0`](https://docs.rual.nl/core-versions/150000).

- [Back to `dns`](https://docs.rual.nl/block-types/dns): Return to the main group to view all sub-groups

- [Back to `DNS zones`](https://docs.rual.nl/block-types/dns?group=DNS%20zones): Return to the group to view all blocks within this group

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