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"IMPORTANT NOTICE FOR SECONDARY DNS ZONES

Important changes are needed for your zone file transfer process (AXFR/IXFR) which will go into effect on October 15, 2021.

If you have not updated already, then it is critical your organization completes the following changes. This will ensure your DNS Secondary Domain Hosting Service continues to operate correctly.

The following steps MUST BE COMPLETED by OCTOBER 15, 2021 to ensure there is no interruption to your current DNS Secondary Domain Hosting Service:

1.Update your Allow List to include all of the following Neustar Zone Transfer IP addresses:
23.21.200.163
23.21.206.251
50.112.240.144
50.112.240.145
54.75.253.83
176.34.183.208
52.201.103.62
52.87.134.132
34.205.12.198
52.201.155.234
52.201.155.120
52.39.68.132
35.165.213.102
52.10.123.90
52.10.63.3

2.Begin sending NOTIFY messages to all of the following Neustar NOTIFY IP addresses:
54.217.202.161
107.21.214.87
54.245.253.13
23.21.48.87
23.21.59.232

Completing these steps will ensure that your zone transfers from your primary name services to your DNS Secondary Domain Hosting Services will not be disrupted.

If you have questions or wish to provide feedback, please contact your Verizon DNS Team by emailing us at: help4u@verizon.com.