---
title: "Serving PMN and LAC"
slug: "serving-pmn-and-lac"
updated: 2026-08-10T20:23:05Z
published: 2026-08-10T20:23:05Z
canonical: "help.idibilling.com/serving-pmn-and-lac"
---

> ## 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.

# Serving PMN and LAC

The Serving PMN and LAC criterion has the following rules:

- The format must be "PMN – LAC", that is, PMN, followed by a space, "-", space, LAC.
- The PMN must be a 6-digit number.
- The LAC must be a 5-digit number. This may include leading zeros.
- The PMN must exist in the [PMN](/v1/docs/maintaining-pmns) table.

> [!NOTE]
> Note
> 
> Does not apply to wireline.