Please be advised that today, Friday, June 16, 2017, at approximately 1:00pm EDT (17:00 UTC), NS1 will be deploying upgrades to our automated zone transfer (AXFR) service. There will be no impact to DNS delivery during this maintenance period, which should be completed within approximately one hour.
In advance of this maintenance, NS1 engineers identified and made contact with all secondary DNS customers whose masters did not have the new transit IP address (220.127.116.11) whitelisted in addition to the existing one (18.104.22.168). Please let this serve as a final reminder to add BOTH IP addresses at your primary DNS provider if you have not done so already.
NS1 engineers will be monitoring the health of zone transfers before, during and after the maintenance. Customers who have identified any issues with AXFR syncing or have further questions should contact email@example.com