---
schema_version: "1"
id: 4a746322026be765baa013ec26ce70b9c15a6b6a747572056be0172ed9d32285
title: Proxy Zone DNS CNAME Format Changes
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/commerce/264-0-0/b2c_20_2_w6694727_proxy_zone_dns_cname_mb.md
canonical_url: https://help.salesforce.com/s/articleView?id=commerce.b2c_20_2_w6694727_proxy_zone_dns_cname_mb.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: c13b8f6a85e51e7671a48e25a240e21e51d51f4c9155e91ae2ba4022fc18690f
description: For new Proxy Zones, the DNS CNAME format now ensures that each generated CNAME is unique.
products:
  - Commerce
  - B2C Commerce
release: "264"
---
# Proxy Zone DNS CNAME Format Changes

For new Proxy Zones, the DNS CNAME format now ensures that each generated CNAME is unique.

Newly generated CNAMEs use the following format.

`commcloud.{prod|dev}-{realmID}-{zone-name}.cc-ecdn.net`

For example, a production instance, with a zone name of “mycompany.com”, and a realm ID of “bbaa” generates this CNAME.

`commcloud.prod-bbaa-mycompany-com.cc-ecdn.net`

![Note](https://sf-zdocs-cdn-prod.zoominsoftware.com/tdta-commerce-b2c_commerce_release_notes-264-0-0-production-enus/4ec7e638-d25e-4c65-96ec-ec874bcf5183/images/icon_note.png)

Note This format change occurs only when creating Proxy Zone DNS CNAMEs. You do not need to update any DNS CNAMEs for existing Proxy Zones.