Testomato Tools

A collection of simple free tools for DNS lookups, SSL certificate checking, and simulating random error responses.

You can see this API in action at:

DNS lookup tool

To perform DNS lookups, use the following URL structure:

/dns/[hostname]/[type]/[resolver]

Parameter	Description	Example values
`hostname`	The domain name you want to query.	`testomato.com`
`type`	The type of DNS record you want to retrieve.	`A`, `AAAA`, `CNAME`, `MX`, `TXT`, `ALL`
`resolver`	A dns resolver to use for the query.	`google`, `cloudflare`, `dig`

Example calls:

/dns/testomato.com/A/google - Get A records for testomato.com using Google's DNS
/dns/testomato.com/ALL/dig - Get all records for testomato.com using system's default DNS resolver

SSL certificate fetcher

To check the SSL certificate of a domain, use the following URL structure:

/ssl/[hostname]

Parameter	Description	Example values
`hostname`	The domain name you want to check.	`testomato.com`

Example call:

/ssl/testomato.com - Check the SSL certificate for testomato.com

Random error simulator

To simulate a random error response, use the following URL structure:

/random-error

Example call:

/random-error - Response with a random error code (e.g., 500, 502, 503, 504)

Service ping

Service ping that will return a simple pong response:

/ping

Pong!

Current Time: 2025-09-04T10:06:17.181Z
Method: GET
URL: https://tools.testomato.com/ping

Headers:
{
  "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
  "accept-encoding": "gzip, deflate, br, zstd",
  "accept-language": "cs-CZ,cs;q=0.9",
  "cookie": "testomato=b64c5d5a95f8b7ae10cb04f665573fdb; _ga=GA1.1.1138330174.1754906504; _gcl_au=1.1.1920085943.1754906504.460358984.1756978358.1756978358; _ga_6KG2KYFJT9=GS2.1.s1756978345$o35$g1$t1756978658$j5$l0$h2005856737",
  "dnt": "1",
  "host": "tools.testomato.com",
  "priority": "u=0, i",
  "sec-ch-ua": "\"Not;A=Brand\";v=\"99\", \"Google Chrome\";v=\"139\", \"Chromium\";v=\"139\"",
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": "\"macOS\"",
  "sec-fetch-dest": "document",
  "sec-fetch-mode": "navigate",
  "sec-fetch-site": "none",
  "sec-fetch-user": "?1",
  "upgrade-insecure-requests": "1",
  "user-agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36",
  "via": "2.0 Caddy",
  "x-forwarded-for": "80.188.134.213",
  "x-forwarded-host": "tools.testomato.com",
  "x-forwarded-proto": "https"
}

Example call:

/ping - response with pong

Usage

You can use it freely for personal and commercial purposes, but please be reasonable and respectful. If you plan to use it heavily or for production purposes please contact us first at info@testomato.com.