---
title: "Service Number Blocks"
slug: "service-number-blocks"
updated: 2026-07-23T12:46:23Z
published: 2026-08-10T20:23:40Z
canonical: "help.idibilling.com/service-number-blocks"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.idibilling.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Service Number Blocks

Service numbers can be tracked and managed in blocks, which are groupings of service numbers at the line number level (NPA-NXX-XXXX). They are created in groups of 1000 consecutive service numbers. For example, within the same exchange (NPANXX):

- line numbers 0000 - 0999 is one block,
- line numbers 1000 - 1999 is another block,
- line numbers 2000 - 2999 is a third block, and so on.

Service Number Blocks are used for NRUF reporting purposes.

> [!NOTE]
> Note
> 
> Service number blocks received from another carrier may contain fewer than 1000 service numbers.

To view the Service Number Blocks currently defined in the system:

1. From the Applications menu, select **Inventory Management > Service Number Inventories > Service Number Blocks**. This displays the Service Number Blocks window.

**(Show picture)**

![ServiceNumberBlocks](https://cdn.us.document360.io/3f7f8ade-bcb1-4ec8-af25-0c0ad8601afb/Images/Documentation/67610(1).png?sv=2026-02-06&spr=https&st=2026-11-14T10%3A58%3A25Z&se=2026-11-14T11%3A58%3A25Z&sr=c&sp=r&sig=uu3R10kEuYsSZs%2BwLgH%2BUbjaxIPwPihPHKz7i1%2FcjP8%3D)

The Service Number Blocks window provides the following information:

| Statistics Updated | Date and time the statistics were last updated. Statistics displayed in this window are automatically generated on a regular basis, via the Inventory Automatic Updates task that is executed by the Job Scheduler (see [Inventory Automatic Updates](/v1/docs/inventory-automatic-updates)). To recalculate these statistics, using the most current data available: - Click **Update Now**. The Service Number Blocks window is updated with the recalculated statistics and this field is updated with the current date and time. |
| --- | --- |
| NPANXX / X | First seven digits (NPA-NXX-X) of the service numbers in this block. |
| Total Numbers | Total number of service numbers in this block that are NRUF reportable (NRUF Category is NOT set to Do Not Report). > [!NOTE] > Note > > A service number is only counted once, even if that service number resides in multiple inventories. |
| Block Status | Current status of this service number block. (See [Inventory Status Reference](/v1/docs/inventory-status-reference).) |
| Contaminated | Identifies whether or not any of the service numbers within this block are assigned to a customer or another carrier (inventory status is Assigned or Intermediate): Yes: Block is contaminated. One or more service numbers within this block are assigned to a customer or another carrier. No: Block is not contaminated. None of the service numbers within this block are assigned to a customer or another carrier. |
| % Utilization | Number of Assigned service numbers that require NRUF reporting, divided by the total number of service numbers in the block (do not include Intermediate service numbers). **Notes**: - Only service numbers that reside in inventories requiring NRUF reporting are included in this calculation. - If a service number resides in multiple inventories, it is only counted once. - Ported-In service numbers are not included in this calculation. - Only percentages greater or equal to 1% are displayed. - Only whole percentages are displayed. |
| Block Owner | Switch that owns this service number block (switch's CLLI). |
| Code Holder | Carrier associated with this service number block. |
| Block Type | Origin of the service numbers within this block: - Code Holder: Your company owns this block. - Received (Not Code Holder): This block is owned by another carrier. You received this block from the pool administrator. - Received (Intermediate): This block is owned by another carrier. You received this block directly from the carrier, without going through the pool administrator. |

Menu options from the Service Number Blocks window:

| New | Opens the Add Additional Service Numbers Wizard. See [Adding Service Numbers to Inventory](/v1/docs/adding-service-numbers-to-inventory-1). |
| --- | --- |
| Add Additional Service Numbers | Opens the Add Additional Service Numbers Wizard. See [Adding Service Numbers to Inventory](/v1/docs/adding-service-numbers-to-inventory-1). |
| Edit | Opens the Edit Service Number Block window. See [Editing a Service Number Block](/v1/docs/editing-a-service-number-block). |
| View Service Numbers | Opens the Service Number Search Results window listing the service numbers within the selected service number block. See [Service Number Search Results](/v1/docs/service-number-search-results). |
| Delete | Removes the service number block. See [Deleting a Service Number Block](/v1/docs/deleting-a-service-number-block). |