UltraDNS Traffic Management capabilities utilize UltraDNS probes located around the world to determine the accessibility of your defined DNS records (hosts and applications). When your host is unreachable, your query responses will be modified based on the actions you have configured in UltraDNS. Actions may include notifications and taking resources out of service.
A firewall, or similar devices can block the IP addresses that are associated with the UltraDNS Traffic Management probes and make your host appear unreachable (down) when in reality, your host is fully available (up) and operational.
Please make the necessary modifications to your firewall security policies to include the following IP addresses associated with UltraDNS Traffic Management probes.
Updates
| Date | Change |
|---|---|
| July 15, 2025 | Added the following IP Addresses to North America East: 156.154.84.153 2610:a1:303c:128::153 156.154.84.154 2610:a1:303c:128::154 |
| Region | IPv4 | IPv6 |
|---|---|---|
| North America East | 156.154.35.153 156.154.35.154 156.154.37.153 156.154.37.154 156.154.84.153 156.154.84.154 156.154.119.153 156.154.119.154 |
2610:a1:3008:128::153 2610:a1:3008:128::154 2610:a1:3010:128::153 2610:a1:3010:128::154 2610:a1:303c:128::153 2610:a1:303c:128::154 2610:a1:3044:128::153 2610:a1:3044:128::154 |
| North America West | 156.154.36.153 156.154.36.154 156.154.38.153 156.154.38.154 156.154.41.153 156.154.41.154 |
2610:a1:300c:128::153 2610:a1:300c:128::154 2610:a1:3014:128::153 2610:a1:3014:128::154 2610:a1:3020:128::153 2610:a1:3020:128::154 |
| North America Central | 156.154.39.153 156.154.39.154 156.154.39.156 156.154.40.153 156.154.40.154 156.154.40.156 |
2610:a1:301c:128::153 2610:a1:301c:128::154 2610:a1:301c:128::156 2610:a1:3018:128::153 2610:a1:3018:128::154 2610:a1:3018:128::156 |
| Europe East | 156.154.76.153 156.154.76.154 156.154.77.153 156.154.77.154 156.154.85.153 156.154.85.154 |
2610:a1:302c:128::153 2610:a1:302c:128::154 2610:a1:3028:128::153 2610:a1:3028:128::154 2610:a1:3040:128::153 2610:a1:3040:128::154 |
| Europe West | 156.154.78.153 156.154.78.154 156.154.80.153 156.154.80.154 |
2610:a1:3030:128::153 2610:a1:3030:128::154 2610:a1:3038:128::153 2610:a1:3038:128::154 |
| South America | 156.154.122.153 156.154.123.153 |
2610:a1:304c:128::153 2610:a1:3048:128::153 |
| Asia | 156.154.99.153 156.154.99.154 156.154.180.153 156.154.180.154 156.154.181.153 156.154.181.154 156.154.182.153 203.119.15.153 203.119.15.154 |
2610:a1:305c:128::153 2610:a1:3054:128::153 2610:a1:3054:128::154 2610:a1:3058:128::153 2610:a1:3058:128::154 2610:a1:3068:128::153 2610:a1:3068:128::154 2610:a1:3070:128::153 2610:a1:3070:128::154 |
| China | 156.154.62.153 156.154.62.154 156.154.63.153 156.154.63.154 |
2610:a1:3074:128::153 2610:a1:3074:128::154 2610:a1:3078:128::153 2610:a1:3078:128::154 |
If you have any questions, please contact UltraDNS Support at dns.ultraproducts.support to open a ticket, or call +1 (844) 929-0808 or +1 (540) 835-5462.