Twilio

ASN Official

Twilio operates AS394434 for voice, messaging, and API infrastructure. For predictable webhook egress, Twilio Editions customers can use Static Proxy (fixed regional CIDRs). Elastic SIP Trunking publishes separate signaling and global media ranges. Always validate X-Twilio-Signature for webhooks; treat IP allowlisting as complementary. Standard REST/webhook callbacks are not a single static list.

Autonomous systems (ASNs)

Known ASNs used by Twilio.

AS394434

Twilio Static Proxy webhook IP ranges

Documentation

Static Proxy ranges are for eligible Twilio Editions customers; Twilio may still egress from other addresses.

https://www.twilio.com/docs/iam/twilio-editions/twilio-static-proxy

Twilio Elastic SIP Trunking — signaling

Documentation

Allow all regional signaling ranges for resiliency; send traffic to your configured termination FQDN, not these addresses directly. Ports 5060 (UDP/TCP) and 5061 (TLS).

https://www.twilio.com/docs/sip-trunking/ip-addresses

Twilio Elastic SIP Trunking — media

Documentation

Media gateway for ICE/STUN/SRTP — destination UDP ports 10000–60000.

https://www.twilio.com/docs/sip-trunking/ip-addresses

Webhook security & related network docs

Documentation

Validate webhooks with X-Twilio-Signature (HMAC-SHA1); IP allowlists are secondary.

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