Which IP Ranges does Retellai Use

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1

For selfhosted n8n we need the ip addresses and range retellai uses for webhooks. I saw that retell uses several IP Adresses. We have to allow them on our system. Please send us the whole package, thx

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2

Here’s what I found:

Retell AI IPs

┌─────────────────────────────┬──────────────────────────┐
│ Purpose │ IP/CIDR │
├─────────────────────────────┼──────────────────────────┤
│ Webhooks/MCP/Function calls │ 100.20.5.228 (single IP) │
├─────────────────────────────┼──────────────────────────┤
│ SIP (all regions) │ 18.98.16.120/30 │
├─────────────────────────────┼──────────────────────────┤
│ SIP (US) │ 143.223.88.0/21 │
├─────────────────────────────┼──────────────────────────┤
│ SIP (US) │ 161.115.160.0/19 │
└─────────────────────────────┴──────────────────────────┘

That single webhook IP (100.20.5.228) is the one that connects to your MCP server. Documented at Secure the webhook - Retell AI.