What IP addresses should I whitelist in order to receive SMS requests from Nexmo?

Question:

What IP addresses do I need to add to my firewall?

What 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?

Answer:

If you are restricting inbound traffic (including delivery receipts), please whitelist the following subnets:

174.37.245.32/29

174.36.197.192/28

173.193.199.16/28

119.81.44.0/28

in your firewall.

Inbound SMS traffic from Nexmo might come from any of the IP addresses included in the referenced subnets.

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