Who sent me this text?

Purpose

Type the sender as it appears on your phone (a name, a short number or a full number) to see what kind of sender it is, whether it names a known brand and where that brand’s links really go.

Requirements

Anyone can read these guides, no account needed. Some tools require Pro, as indicated in each guide.

Type the sender exactly as your phone shows it: a name, a short number or a full phone number. The check runs in your browser.

How to use it

1. 1

   Type the sender exactly as your phone shows it: a name, a short number or a full phone number. The check runs in your browser.

2. 2

   Check

Synthetic example

DEMO

Interpret the result

A sender name that uses DEMO: Whoever sends a text message chooses the name it shows, and scammers use DEMO’s name too. NoCall’s data doesn’t record which sender names DEMO uses, so the name alone can’t tell you whether the message is real.

A sender name: The message was sent with a name instead of a number. Companies use names for automated messages, but whoever sends the message chooses the name, so it can be faked. It doesn’t match any brand in NoCall’s SMS rules.

A short number: Short numbers are used for automated messages, alerts and subscriptions, and some of these services are paid. Don’t reply with keywords or sign up to anything you don’t recognise.

An ordinary phone number: The message came from an ordinary number. If it says it’s from a company or an authority and asks you to tap a link, call or pay, be extra careful: companies usually send bulk messages under a name or a short number.

A number from another country (+44): The message came from a foreign number. If it claims to be from a company or an authority in your country, be extra careful, and never call it back.

Limitations

The check runs in your browser: the sender you type is not sent or saved.

Troubleshooting

Type the sender as it appears: a name, a short number or a phone number.

Use with the API

Classifies an SMS sender: known brand name, other name (and lookalike), short code, national or international number.

Send the JSON body to the tool's own route, or to POST /v2/tools with the tool field added. Both routes return the same result.

POST https://api.nocall.io/v2/sms-sender
POST https://api.nocall.io/v2/tools  {"tool":"sms-sender","sender":"Correos","country":"ES"}

REQUEST_ID="$(uuidgen)" && [ -n "$REQUEST_ID" ] &&
curl --request POST 'https://api.nocall.io/v2/sms-sender' \
  --header "Authorization: Bearer $NOCALL_API_KEY" \
  --header 'Content-Type: application/json' \
  --header "Idempotency-Key: $REQUEST_ID" \
  --data '{"sender":"Correos","country":"ES"}'

import json
import os
import urllib.request
import uuid

api_key = os.environ.get('NOCALL_API_KEY')
if not api_key:
    raise SystemExit('Set NOCALL_API_KEY')

request = urllib.request.Request(
    'https://api.nocall.io/v2/sms-sender',
    method='POST',
    data=json.dumps({'sender': 'Correos', 'country': 'ES'}).encode(),
    headers={
        'Authorization': 'Bearer ' + api_key,
        'Content-Type': 'application/json',
        'Idempotency-Key': str(uuid.uuid4()),
    },
)
with urllib.request.urlopen(request, timeout=30) as response:
    result = json.load(response)
print(result['data']['result'], result['meta']['unitsCharged'])

import { randomUUID } from 'node:crypto';

const requestId = randomUUID();
const apiKey = process.env.NOCALL_API_KEY;
if (!apiKey) throw new Error('Set NOCALL_API_KEY');

const response = await fetch('https://api.nocall.io/v2/sms-sender', {
  method: 'POST',
  headers: {
    Authorization: 'Bearer ' + apiKey,
    'Content-Type': 'application/json',
    'Idempotency-Key': requestId,
  },
  body: JSON.stringify({ sender: 'Correos', country: 'ES' }),
});
const result = await response.json();
if (!response.ok) throw new Error(result.error?.code ?? 'request_failed');
console.log(result.data.result, result.meta.unitsCharged);

{
  "data": {
    "tool": "sms-sender",
    "result": {
      "kind": "brandName",
      "tooLong": false,
      "brand": {
        "name": "Correos",
        "keys": [
          "correos"
        ],
        "officialDomains": [
          "correos.es",
          "correos.com",
          "correosexpress.com"
        ]
      }
    }
  },
  "meta": {
    "requestId": "req_example",
    "unitsCharged": 1,
    "usage": {
      "periodStart": "2026-10-01",
      "unitLimit": 20,
      "unitsUsed": 3,
      "unitsRemaining": 17
    }
  }
}

• API reference ↗

Frequently asked questions

Related guides

• Check if a text message is a scam
• Check a link