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 - nanps.com
HTTP Status: 503
User-Agent: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; [email protected])
Server: nginx
Date: Sun, 18 May 2025 13:10:30 GMT
Content-Type: text/html
Content-Length: 4087
Connection: keep-alive
ETag: "65264d29-ff7"

HTTP Code 503 Service Unavailable

503 status code 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: nanps.com
Accept: */*
User-Agent: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; [email protected])

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="ja">
  <head>
    <title>503 error</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <meta http-equiv="Content-Style-Type" content="text/css">
    <meta http-equiv="Content-Script-Type" content="text/javascript">
    <style type="text/css">
    <!--
    * { margin: 0; padding: 0; }
    body { margin: 20px 40px; padding:0; font-family: Verdana; }
    a:link { color: #008ECD; }
    img { border: none; }
    div#header { background: url('data:image/gif;base64,R0lGODlhIgAjAPcAAAAAAP////39/vDx9fP09/Hy9fv8/vr7/fb3+fX2+PT199/j6tvf5u/z+kJOYdPf8r/H1L3F0rzE0bvD0LrCz9bb49Xa4tTZ4dPY4Ozx+efq7+bp7uXo7eTn7OLl6ktacD5KXGuAnml9m2N2klJieU5dc3iPsFprhFVlfUVSZUBMXldnf1xshFxrgXyPq2Jxh36QqoKUrq/H6XWFnHuLoqS514GQp1RebbXK6JipwrvP7LbJ5rLF4L7R7cXW756rv8DP5cjX7szb8a+6y6q1xcLO4L3J2rvH2LrG19Le79fj9Nbi88vW5rS9y5ujr9rl9bfAzra/zbnCz7jBzt7n9cDI1L/H09rj8Njh7uLq9sjP2crR28nQ2tjf6ejv+efu+N3h5/H1++Dk6unr7nGIqE9fdUhXa3SLq26Eol5xi1tthlBgdkpZbWZ6llhpgXGGo1lpfmR1jV1tg2NziW5/l3iLpJuy0pGnxYicuKe/4K/I6anB4bLK6rXM67fO7LjO65qsxaG0zZOjubrN58DT7bnL5K/A2MLV7rvL4cPT6cra8M/e8rfD0624x8XR4cPO3bO9y9jk9NTg8Nvm9crU4cPL1sLK1dbe6c3T29ne5djd5Nfc4/Dz9+ns8EdWadHg86OuvLG8ytzn9cbO2MXN1+Xt99DX4M7V3s3U3czT3Nzj7Nrh6t/k6tjd49Xa4PL2++vv9OPn7OLm63mVtdHY4M/W3t/m7urx+cPW6s7g8s3c6+Pq8ePo7e7x9Ovu8ert8Pj5+tzd3r7W7dDg7kmCrF+Mrm6VtHqgvYirxcfe70yJs0uHsUeAqEZ9pVORvFGOt1aTvFqVvlyYwGGcxGCbw2KdxWKYvWOStGaWuX2szIuxzKXH3rbR49rk6/b5+1WSumiiyG+nzHasznitz3Smx3+z1Iq515vE3avN497r8vH3+tDn8szi69bs8+L09un58/39/fr6+vn5+ff39/T09PPz8/Dw8O/v7+3t7evr6+np6efn5+Xl5eLi4uDg4P///yH5BAEAAP8ALAAAAAAiACMAAAj/AAMIHDjQiEFAORLiIfMGDRoYHQhKnChx1hEkq7pcusQrTIMGGR6h0UKxJEETAkxFiAChipRQkJo8ynIJxg8EJkuaMECESKMhoZpEmSKFUSRRVwTZ8JBzookDjRoFHUpBQgQriag8mTRkBqamBM94GwKJqlUrVSrxyEIl0pIidECBFSi2CRQpVqtYIjVKCyIlXqgoWaTLxowEYM+8mlIVLV8tW1I58hMm8OBPP16AJRNmQoS0fbmkOlWL1p9JlQUHWYQC7JsGn/mKPmUKwwULuA4dqCzJkJDWTdE0qEIKMqpasy5U0JRJl7BbB57UoKSIBFg0GYpvQUWrWLNjDBiA/+mGLdcSPTtkVQcb4pZxWsaaMSOGjJUsbcu2Cftja4OPNWCJ4MV2tFywyTXEELOMNtp844w1yQzjiy8+lBHgF9wZKB42yyjzzDfRTNPOOrAUUMAhJQRYSi0aguHBAtY8A4001KTjjjsJKEAAIR+A1UYWGFSQiYsdaMDLjNOAw8073gDjZA89NvXjBZowIEYsGvwSjTTVgBOOOOwIIKYAOrAB1ghUVCCeLBv8Qg6X45gzTjnmpDOQDmacKUqVYnTQSTZwxhPAOeaYs81Af3gCVhxPDMmmNtIkGY8AAqFzDkF+pABWGpEwsACWnYgDzi6UDqQOQX1o2lQaS1jJQSe9DP+gywE58eHApkuAIQsHvvSiADDw1HprU2o8oOsGvhSQADClliSDCoJSFI8887Dwia4aJLssRQd8ocQhMoAwjzwETTsPPfXYc8Ii2GoLzEBhZPFJD3vcUUcLKdxAzzzRUovuPfno4wa7bPoyACelUCGEDjXgQQccDshRBx552LOvPOami48+/PSzghBgqIJFEkEMEkgMcZRAAh0x2CHDIEx0MYbF4/prz8YdB4OCIooYkgMNc3wQhwt35IEDEI640g8/+uBjTz3jmkvPzfrs048/KDwsBxp4uFyII6cE448/S+uTzz31XCxQPOfWcw8++ezDjxN37HE0Ja30s/Q++5g1jc89T18crUD+omvP23Dno7ji+Pxtz9NpzxN1SdNSey49mGeeueTydB7P4HN9LvrooM8VQEAAOw==') no-repeat top left; background-position: 0 8px; }
    h1 { font-size: 12px; margin: 0; padding: 0 0 0 52px; color: #008ECD; }
    h2 { font-size: 26px; margin: 0; padding: 0 0 0 50px; color: #008ECD; }
    #header p { margin-top: 5px; font-weight: bold; font-size: 11px; }
    dl { margin-top: 30px; }
    dt { font-size: 12px; font-weight: bold; width: 605px; height: 18px; padding: 5px 0 0 10px; color: #fff; background-color: #000; border-left: 5px solid #808080; }
    dd { width: 620px; font-size: 11px; line-height: 180%; padding-left: 7px; }
    dd.top { padding-top: 10px; }
    div#footer { width: 620px; border-top: 2px solid #B2B2B2; margin-top: 40px; }
    div#footer p { font-size: 11px; line-height: 180%; font-weight: normal; padding: 10px 7px; }
    div#banner { padding: 15px 5px; }
    -->
    </style>
  </head>
  <body>
    <div id="header">
      <h1>503 Error</h1>
      <h2>Service Unavailable</h2>
      <p style="line-height:180%;">サーバの一時的な過負荷あるいはメンテナンスのため<br>現在、リクエストを扱うことができません。</p>
    </div>
    <script src="//www.google-analytics.com/urchin.js" type="text/javascript"> </script>
    <script type="text/javascript"> _uacct = "UA-3482791-3"; urchinTracker(); </script>
  </body>
</html>

Whois info of domain

Domain Name: NANPS.COM
Registry Domain ID: 1437789535_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.discount-domain.com
Registrar URL: http://gmo.jp
Updated Date: 2025-02-28T23:12:56Z
Creation Date: 2008-03-29T19:39:13Z
Registry Expiry Date: 2026-03-29T19:39:13Z
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: ok https://icann.org/epp#ok
Name Server: DNS0.HETEML.JP
Name Server: DNS1.HETEML.JP
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2025-05-18T13:10:22Z <<<
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