Due to the switching of ISPs, the IP addresses of zoho.com services will temporarily change. So we request all customers who have configured zoho.com IP addresses for various reasons, to configure this additional IP subnet - 165.254.168.0/24. This will ensure you have continued service access during the maintenance period. The IPs will revert to the old values once the maintenance is over.

Due to this temporary ISP change, there may be disturbances in accessing Zoho's services during the maintenance period. Sorry for the inconvenience this may be causing you.

UPDATE (Dec 25, 05:09 PST): The maintenance is over. All services are back to normal. You can reconfigure / switch back to the old IPs / IP subnet for the respective services.

UPDATE: Please read the below post too, which has additional details for Zoho Mail, CRM Mail Add On, Recruit Mail Add on, Zoho Support and Zoho Contact Manager users.Zoho Sites users: During the maintenance period, please configure your domain's DNS (A RECORD) by replacing the existing IP address (74.201.154.208) with the temporary IP 165.254.168.27 (this IP will be accessible 2 hours before maintenance period; revert to the old IP once the maintenance is over).

Zoho Campaigns users: Please refer to the below post.

Season's Greetings from Team Zoho!