If any domain in your reseller plan (including your own) points to these DNS:
ns100.dizinc.com
ns101.dizinc.com
You *MUST* change them at this time.
These are the new DNS:
ns597.dizinc.com
ns598.dizinc.com
Refer to announcement:
Important : Read if you use ns100.dizinc.com and ns101.dizinc.com as DNS