Create a Tailscale Subnet Router

curl --request POST \
  --url https://api.telnyx.com/v2/tailscale_subnet_routers \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "tailnet-ashburn",
  "network_id": "0de011ae-ee53-4df4-ba96-754728eb5aad",
  "region_code": "ashburn-va",
  "advertised_routes": [
    "172.27.0.0/24"
  ],
  "auth_key": "tskey-auth-k1AbCdEfGh2IjKlMnOpQrStUv"
}
'

import requests

url = "https://api.telnyx.com/v2/tailscale_subnet_routers"

payload = {
    "name": "tailnet-ashburn",
    "network_id": "0de011ae-ee53-4df4-ba96-754728eb5aad",
    "region_code": "ashburn-va",
    "advertised_routes": ["172.27.0.0/24"],
    "auth_key": "tskey-auth-k1AbCdEfGh2IjKlMnOpQrStUv"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    name: 'tailnet-ashburn',
    network_id: '0de011ae-ee53-4df4-ba96-754728eb5aad',
    region_code: 'ashburn-va',
    advertised_routes: ['172.27.0.0/24'],
    auth_key: 'tskey-auth-k1AbCdEfGh2IjKlMnOpQrStUv'
  })
};

fetch('https://api.telnyx.com/v2/tailscale_subnet_routers', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.telnyx.com/v2/tailscale_subnet_routers",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'name' => 'tailnet-ashburn',
    'network_id' => '0de011ae-ee53-4df4-ba96-754728eb5aad',
    'region_code' => 'ashburn-va',
    'advertised_routes' => [
        '172.27.0.0/24'
    ],
    'auth_key' => 'tskey-auth-k1AbCdEfGh2IjKlMnOpQrStUv'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.telnyx.com/v2/tailscale_subnet_routers"

	payload := strings.NewReader("{\n  \"name\": \"tailnet-ashburn\",\n  \"network_id\": \"0de011ae-ee53-4df4-ba96-754728eb5aad\",\n  \"region_code\": \"ashburn-va\",\n  \"advertised_routes\": [\n    \"172.27.0.0/24\"\n  ],\n  \"auth_key\": \"tskey-auth-k1AbCdEfGh2IjKlMnOpQrStUv\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.telnyx.com/v2/tailscale_subnet_routers")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"name\": \"tailnet-ashburn\",\n  \"network_id\": \"0de011ae-ee53-4df4-ba96-754728eb5aad\",\n  \"region_code\": \"ashburn-va\",\n  \"advertised_routes\": [\n    \"172.27.0.0/24\"\n  ],\n  \"auth_key\": \"tskey-auth-k1AbCdEfGh2IjKlMnOpQrStUv\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.telnyx.com/v2/tailscale_subnet_routers")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"name\": \"tailnet-ashburn\",\n  \"network_id\": \"0de011ae-ee53-4df4-ba96-754728eb5aad\",\n  \"region_code\": \"ashburn-va\",\n  \"advertised_routes\": [\n    \"172.27.0.0/24\"\n  ],\n  \"auth_key\": \"tskey-auth-k1AbCdEfGh2IjKlMnOpQrStUv\"\n}"

response = http.request(request)
puts response.read_body

{
  "data": {
    "id": "5c6f0a7e-6c7b-4d7f-9f2e-3b1e4e9a8c21",
    "record_type": "tailscale_subnet_router",
    "name": "tailnet-ashburn",
    "network_id": "0de011ae-ee53-4df4-ba96-754728eb5aad",
    "region_code": "ashburn-va",
    "advertised_routes": [
      "172.27.0.0/24"
    ],
    "status": "provisioning",
    "customer_address": "172.27.254.1",
    "device_id": null,
    "tailnet_name": null,
    "tailscale_ips": [],
    "created_at": "2026-10-13T15:04:05.123456Z",
    "updated_at": "2026-10-13T15:04:05.123456Z"
  }
}

{
  "errors": [
    {
      "code": "10015",
      "title": "Bad Request",
      "detail": "Routes must exclude default, local, and Tailscale ranges.",
      "meta": {
        "url": "https://developers.telnyx.com/docs/overview/errors/10015"
      }
    }
  ]
}

{
  "errors": [
    {
      "code": "10027",
      "title": "Unprocessable Entity",
      "detail": "The server understood the syntax of the request but was unable to process the instructions."
    }
  ]
}

{
  "errors": [
    {
      "code": "<string>",
      "title": "<string>",
      "detail": "<string>",
      "source": {
        "pointer": "<string>",
        "parameter": "<string>"
      },
      "meta": {}
    }
  ]
}