---
sourceDocument: Australia Telecommunications Network Inventory
sourceDocumentLink: https://servicenow-prod.fluidtopics.net/r/telecom-network-inventory

 Release :

    - australia

ft:locale :

    - en-US

ft:publication_title :

    - Australia Telecommunications Network Inventory

ft:clusterId :

    - telninv

bundleId :

    - telninv

workflow :

    - Customer and Industry


---

# IP Subnetwork form

# IP Subnetwork form {#ariaid-title1}

Release version: Australia  
Updated September 10, 2026  
![](https://www.servicenow.com/docs/portal-asset/ico-clock) 1 minute to read  
The IP Subnetwork form defines a subdivision of an IP Address Block or a nested subdivision of another IP Subnetwork.

## IP Subnetwork form fields

{#ip-subnetwork-form__ip-subnetwork-form-fields__entry__2}

| Field | Description |
|-|-|
| Name (Nested Pool Name on creation) | User-friendly name for the IP Subnetwork. |
| CIDR | The CIDR notation that defines the address range of this subnetwork. The value Must fall within the parent's range, must be more specific (longer prefix) than the parent'hs, and must not duplicate any sibling under the same parent. For more information about CIDR validation, see [CIDR validation rules for IP Address Blocks and IP Subnetworks](https://servicenow-prod.fluidtopics.net/pz42Yup53fGYi9ouI5lr_A "The CIDR value entered on an IP Address Block or IP Subnetwork record is validated when the record is saved. Invalid CIDR values are rejected with an inline error message; the record cannot be saved until the value passes all rules."). |
| Managed Network | The Managed Network that this subnetwork belongs to. This field is read-only and pre-populated when the parent has a Managed Network set. This field is editable when the parent has none. Cannot differ from the parent's value. |
| Parent Pool | The parent IP Address Block or IP Subnetwork. This field is read-only after creation. |
| DNS Domain | The DNS domain associated with this subnetwork. |
| Description | Free-text description. |
| Life Cycle Stage | The current life-cycle stage of the subnetwork. This field is automatically set to Operational. |
| Life Cycle Stage Status | The current life-cycle stage status. This field is automatically set to In Use Note: The subnetwork is active when Life Cycle Stage is Operational, and when the Life Cycle Stage Status is In Use. |
| Reported Addresses In Use | The count of addresses currently in use under this subnetwork. |
| Reported Free Addresses | The count of addresses available for use under this subnetwork. |
| Reported Reserved Addresses | The count of addresses flagged as reserved under this subnetwork. |
[Table 1. IP Subnetwork form fields]

{#ip-subnetwork-form__ip-subnetwork-form-fields}
**Related concepts**   

* [Managed Network and IP address allocation](https://servicenow-prod.fluidtopics.net/nf5Kq4mJusXInpmSLduO4w "A Managed Network record defines a network scope that can be assigned to an IP Address Block. After assigned, the Managed Network propagates to every IP Subnetwork beneath that block.")  
**Related tasks**   

* [Create an IP Subnetwork record](https://servicenow-prod.fluidtopics.net/9uvIJPRcTs8lUhUZ167X8A "Create an IP Subnetwork record to subdivide an IP Address Block or to nest a subnetwork within an existing IP Subnetwork. The subnetwork's CIDR must fall within its parent's range. This task supports both IPv4 and IPv6.")  
**Related reference**   

* [CIDR validation rules for IP Address Blocks and IP Subnetworks](https://servicenow-prod.fluidtopics.net/pz42Yup53fGYi9ouI5lr_A "The CIDR value entered on an IP Address Block or IP Subnetwork record is validated when the record is saved. Invalid CIDR values are rejected with an inline error message; the record cannot be saved until the value passes all rules.")
* [Hierarchy rules for IP Subnetworks](https://servicenow-prod.fluidtopics.net/w23g6E9ewprlk5TMK~fNmQ "These rules apply only when creating or updating an IP Subnetwork (which always has a parent — either an IP Address Block or another IP Subnetwork).")
* [Inventory number allocation fields](https://servicenow-prod.fluidtopics.net/aDz1~zcDpFepvPA6bQe_5Q "The inventory number allocation fields enables you to describe the details for LAG, VLAN, IP address, and telephone number records.")