- Which IP addresses do I need to add to my firewall?
- Which IP addresses do you use to send requests to my MO or DLR webhook URL?
- Can I use a firewall and still receive inbound requests from you?
- I am not receiving callbacks to my HTTP server. Why might this be?
We strongly discourage IP whitelisting and encourage customers instead to verify the callbacks by using Signed Callbacks. Information can be found in our developer Docs.
If you are restricting inbound traffic, including status reports and delivery receipts, please whitelist the following subnets:
22.214.171.124 -126.96.36.199 (188.8.131.52/28)
184.108.40.206 - 220.127.116.11 (18.104.22.168/28)
22.214.171.124 - 126.96.36.199 (188.8.131.52/28)
Inbound SMS traffic from Nexmo might come from any of the IP addresses included in the referenced subnets.