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Custom Domains Now Available for Edge Compute Functions

24, Aug 2026

Custom domains are available for Telnyx Edge Compute Functions, giving you full control over the certificate chain, CA, and rotation schedule instead of relying on a platform-managed certificate.

What's New

  • Custom domain support: Add [[domains]] blocks to telnyx.toml and serve functions from your own hostname instead of the default *.telnyxcompute.com URL.
  • Bring your own TLS certificate: Upload your own PEM-encoded certificate and private key. Certificates are stored encrypted with AES-GCM.
  • One-time DNS verification: Prove domain ownership with a TXT record at _telnyx-verification.<domain>. No re-verification needed when you update or replace certificates.
  • Multiple domains per function: Point several domains at the same function. The limit is 25 custom domains per organization with no per-function restriction.
  • Simultaneous routing: The custom domain and the default *.telnyxcompute.com URL both serve traffic at the same time. If a certificate expires, the default URL keeps working while you rotate the cert.
  • TLS 1.2 and 1.3 supported. HTTP/2 supported. HTTP/3 not available.
  • No certificate restrictions beyond PEM format. No size limit, no minimum key size, no certificate type restriction, no chain length limit. The certificate must not be expired and the SAN or CN must match the domain.
  • Verification has no timeout. Add the TXT record anytime and retry as needed. The token does not expire.

Why It Matters

Customers can now serve Edge Compute Functions under their own domain, so end users interact with a familiar URL instead of a platform-managed endpoint. This keeps branding consistent for customer-facing applications and gives teams full control over their certificate chain, CA, and rotation schedule without relying on a platform-managed certificate.

What's Next

  • ACME auto-provisioned certificates to handle issuance and renewal automatically for teams who want a managed option
  • Wildcard domain support for covering multiple subdomains with a single entry
  • Temporary disable without deleting and recreating the domain

Getting Started

  1. Update to telnyx-edge v0.5.0 or later.
  2. Add a [[domains]] block to your telnyx.toml with your hostname.
  3. Run telnyx-edge domains add api.acme.com <function_id> to generate a DNS TXT record. For example: telnyx-edge domains add api.acme.com 0160246a-7452-47dc-bf54-84dabc3dd143
  4. Add the TXT record to your DNS provider at _telnyx-verification.<domain> with the value telnyx-verify=<hex token>.
  5. Run telnyx-edge domains verify api.acme.com to complete one-time verification.
  6. Run telnyx-edge domains cert upload api.acme.com --cert cert.pem --key key.pem with your PEM certificate and private key.
  7. Deploy your function. Both your custom domain and the default *.telnyxcompute.com URL will serve traffic.

Read the Custom Domains docs to get started.