check web redirect url status code checker

Check server response of

Server response
NS records
Whois domain
Response headers
Request headers
Raw HTML code
503 Service Unavailable - smlvo.com
HTTP Status: 503
User-Agent: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; [email protected])
Server: nginx
Date: Wed, 14 May 2025 13:36:06 GMT
Content-Type: text/html
Content-Length: 2127
Connection: keep-alive
ETag: "63eb3d37-84f"

HTTP Code 503 Service Unavailable

503 Service Unavailable indicates that the server is temporarily unavailable due to overload or maintenance.

When is Code 503 used?

  • When a server is overloaded with traffic
  • When the server is undergoing scheduled maintenance
  • When a web application temporarily restricts access

What does Code 503 mean for the user?

The user must wait and try again later, as the server is currently unavailable.

GET / HTTP/1.1
Host: smlvo.com
Accept: */*
User-Agent: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; [email protected])

<!DOCTYPE html>
<html lang="ja">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width">
    <title>503 Error - Service Temporarily Unavailable</title>
    <style>
      html,body,h1,p {
        margin: 0;
        padding: 0;
      }

      body,html {
        height: 100%;
        text-align: center;
        font-family: 'ヒラギノ角ゴ Pro W3', 'Hiragino Kaku Gothic ProN', Meiryo, 'MS PGothic', Arial, sans-serif;
        background: #fafbfd;
        color: #505254;
      }

      .container {
        padding: 100px 30px;
      }

      .message {
        margin: 20px 0;
        font-size: 20px;
        line-height: 160%;
      }
    </style>
  </head>
  <body>
  <div class="container">
    <svg xmlns="http://www.w3.org/2000/svg" width="99" height="85" viewBox="0 0 99 85"><style type="text/css">.st0{fill:#E2E8EE;}</style><path class="st0" d="M78.3 25.9h-72.3c-1.8 0-3.2 1.5-3.2 3.2v14.6c-.1 1.8 1.4 3.3 3.2 3.3h72.3c1.8 0 3.2-1.5 3.2-3.2v-14.7c0-1.8-1.4-3.2-3.2-3.2zm-69.5 8.3c-1.2 0-2.2-1-2.2-2.2 0-1.2 1-2.2 2.2-2.2 1.2 0 2.2 1 2.2 2.2 0 1.2-1 2.2-2.2 2.2zm67.7 9.2h-32.2v-3.8h32.3v3.8zM78.3 2.9h-72.3c-1.8 0-3.2 1.5-3.2 3.2v14.6c-.1 1.9 1.4 3.3 3.2 3.3h72.3c1.8 0 3.2-1.5 3.2-3.2v-14.6c0-1.8-1.4-3.3-3.2-3.3zm-69.5 8.3c-1.2 0-2.2-1-2.2-2.2s1-2.2 2.2-2.2c1.2 0 2.2 1 2.2 2.2s-1 2.2-2.2 2.2zm67.7 9.3h-32.2v-3.8h32.3v3.8zM63.2 66.4h-18.9v-3.8h19.4c1.7-6.8 7.9-11.9 15.3-11.9.8 0 1.6.1 2.4.2-.5-1.2-1.6-2-3-2h-72.4c-1.8 0-3.2 1.5-3.2 3.2v14.6c0 1.8 1.5 3.2 3.2 3.2h57.6c-.3-1.1-.4-2.3-.4-3.5zm-54.4-9.3c-1.2 0-2.2-1-2.2-2.2s1-2.2 2.2-2.2 2.2 1 2.2 2.2-1 2.2-2.2 2.2zM78.7 52.3c-7.7 0-13.9 6.2-13.9 13.9s6.2 14 13.9 14 13.9-6.2 13.9-13.9-6.2-14-13.9-14zm7.6 18.8c.3.3.3.8 0 1.1l-1.6 1.6c-.3.3-.8.3-1.1 0l-4.9-4.8-4.8 4.8c-.3.3-.8.3-1.1 0l-1.6-1.6c-.3-.3-.3-.8 0-1.1l4.8-4.8-4.8-4.8c-.3-.3-.3-.8 0-1.1l1.6-1.6c.3-.3.8-.3 1.1 0l4.8 4.8 4.8-4.8c.3-.3.8-.3 1.1 0l1.6 1.6c.3.3.3.8 0 1.1l-4.8 4.8 4.9 4.8z"/></svg>
    <h1 class="message">503 Error</h1>
    <p>一時的なサーバー過負荷のため<br>現在ページを表示できません。</p>
  </div>
  </body>
</html>

Whois info of domain

Domain Name: SMLVO.COM
Registry Domain ID: 378030799_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.discount-domain.com
Registrar URL: http://gmo.jp
Updated Date: 2025-02-14T22:40:05Z
Creation Date: 2006-03-16T22:58:57Z
Registry Expiry Date: 2026-03-16T21:58:57Z
Registrar: GMO Internet Group, Inc. d/b/a Onamae.com
Registrar IANA ID: 49
Registrar Abuse Contact Email: [email protected]
Registrar Abuse Contact Phone: +81.337709199
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Name Server: UNS01.LOLIPOP.JP
Name Server: UNS02.LOLIPOP.JP
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2025-05-14T13:35:47Z <<<
For more information on Whois status codes, please visit https://icann.org/epp
NOTICE: The expiration date displayed in this record is the date the
TERMS OF USE: You are not authorized to access or query our Whois
by the following terms of use: You agree that you may use this Data only
to: (1) allow, enable, or otherwise support the transmission of mass