These are the IP addresses Singular uses to send postbacks. Depending on your security settings, you may need to whitelist these addresses to receive postbacks.
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| Postback Server IP Addresses (in CIDR Notation) |
| 198.134.6.0/23 |
| 44.239.146.125/32 |
| 54.200.124.61/32 |
| 54.69.245.48/32 |
| 34.208.244.242/32 |
| 34.212.94.34/32 |
| 44.239.107.210/32 |
| 44.237.116.233/32 |
| 44.240.64.97/32 |
| 35.85.128.184/32 |
| 35.160.64.114/32 |
| 44.235.165.174/32 |
| 35.155.194.216/32 |