---
name: vpc-faq-par
title: FAQ for public address ranges
description: The following questions are commonly asked about public address ranges. If you have additional questions you'd like to see addressed here, open an issue by using the **Open doc issue** or **Edit topic** links at the end of this page.
last-updated: 2026-08-25
---

> ## Documentation Index
> The table of contents for this documentation set is at https://cloud.ibm.com/docs/vpc?format=markdown
> The index for all IBM Cloud docs is at: https://cloud.ibm.com/docs/llms.txt
> Use these files to discover more information as needed.

# FAQ for public address ranges
{: #faq-public-address-ranges}

The following questions are commonly asked about public address ranges. If you have additional questions you'd like to see addressed here, open an issue by using the **Open doc issue** or **Edit topic** links at the end of this page.
{: shortdesc}


## Can I bring my own public IP address range?
{: #assign-public-ips}
{: faq}
{: support}



No. Only IBM-provided public IPs are supported. BYOIP (Bring Your Own IP) is not available for this service.

## What public IP address range sizes can I reserve?
{: #prefix-sizes}
{: faq}
{: support}

You can reserve ranges with the following prefix sizes:

* `/28` = 16 IPs
* `/29` = 8 IPs
* `/30` = 4 IPs
* `/31` = 2 IPs
* `/32` = 1 IP

After reserving a range, you can't change its size. Make sure to reserve a range that's large enough to meet your current and future needs.

If you require a prefix size larger than `/28`, [contact support](https://cloud.ibm.com/unifiedsupport/cases/form){: external} to request a quota increase.

IPs in different public address ranges aren't guaranteed to be contiguous.
{: note}



## Can I divide a public address range across multiple VPCs or zones?
{: #divide-par}
{: faq}
{: support}

No. A public address range is indivisible. It cannot be split or shared across multiple VPCs or availability zones.

## Can I reserve and use multiple public address ranges in a single VPC?
{: #reserve-use-multiple-public-address-ranges}
{: faq}
{: support}

Yes. You can reserve and bind multiple public address ranges to a single VPC to meet scaling or isolation requirements.

## Are public address ranges automatically redundant across zones?
{: #redundant-by-default}
{: faq}
{: support}

Not by default. However, you can create separate public address ranges in different zones and configure routing to ensure high availability across zones.



## Related links
{: #faq-related-links-par}

- [Getting started with public address ranges](https://cloud.ibm.com/docs/vpc?topic=vpc-about-par&format=markdown)
- [Planning considerations for public address ranges](https://cloud.ibm.com/docs/vpc?topic=vpc-par-planning&format=markdown)
- 
- [IAM roles and actions](https://cloud.ibm.com/docs/iam?topic=iam-iam-service-roles-actions&format=markdown#is.public-address-range-roles)
- [Quotas](https://cloud.ibm.com/docs/vpc?topic=vpc-quotas&format=markdown#par-quotas) and [service limits](https://cloud.ibm.com/docs/vpc?topic=vpc-quotas&format=markdown#service-limits-for-vpc-services)
- [Known issues](https://cloud.ibm.com/docs/vpc?topic=vpc-par-known-issues&format=markdown)
- [Troubleshooting](https://cloud.ibm.com/docs/vpc?group=tbs-par&format=markdown)