---
title: "What are the Domains on the Network Utility DNS Test used for?"
slug: "what-are-the-domains-on-the-network-utility-dns-test-used-for"
updated: 2026-05-11T10:59:41Z
published: 2026-05-21T21:25:00Z
canonical: "help.8x8.com/what-are-the-domains-on-the-network-utility-dns-test-used-for"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.8x8.com/llms.txt
> Use this file to discover all available pages before exploring further.

# What are the Domains on the Network Utility DNS Test used for?

## Question

What are the Domains on the Network Utility DNS Test used for?

## Applies To

- Network Utility
- DNS

## Answer

- **<pcsbc.packet8.net>**
  - Poly Session Border Controller used for Poly registration over UDP. Used for phones that do not have SRTP enabled.
- **<adsbc.packet8.net>**
  - Android Session Border Controller for Work Mobile registration over UDP.
- **<ip.packet8.net>**
  - iPhone Session Border Controller, used for iPhone registration with Work Mobile over UDP.
- **<lssbc.8x8.com>**
  - Cisco Session Border Controller, used for Cisco device registration over UDP.
- **<ssbc.8x8.com>**
  - Poly Secure Session Border Controller, used for SRTP enabled lines to register using TCP traffic (SIP over TLS).
- **<vodsbc.packet8.net>**
  - Work Desktop Session Border Controller, used for registration over UDP.
- **<vodssbc.packet8.net>**
  - Work Desktop Secure Session Border Controller, used for registration over TCP using TLS
- **<cssbc.8x8.com>**
  - Cisco with SRTP enabled

## Additional Information

Additional information on the Network Utility tool can be found [How to Read the Network Utility Tool Results](/support/docs/how-to-read-the-network-utility-tool-results).