check web redirect url status code checker

Check server response of

Server response
NS records
Whois domain
Response headers
Request headers
Raw HTML code
401 Unauthorized - sigdp.com
HTTP Status: 401
User-Agent: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; [email protected])
Server: nginx
Date: Fri, 02 May 2025 00:52:46 GMT
Content-Type: text/html
Content-Length: 172
Connection: keep-alive
WWW-Authenticate: Basic realm="Authorization"

HTTP Code 401 Unauthorized

401 Unauthorized means that access to the requested resource requires authentication.

When is Code 401 used?

  • When accessing a restricted page without login credentials
  • When an API request lacks valid authentication tokens

What does Code 401 mean for the user?

The user must log in or provide valid credentials to access the resource.

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

<html>
<head><title>401 Authorization Required</title></head>
<body>
<center><h1>401 Authorization Required</h1></center>
<hr><center>nginx</center>
</body>
</html>

Whois info of domain

Domain Name: SIGDP.COM
Registry Domain ID: 1994537050_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.namesilo.com
Registrar URL: http://www.namesilo.com
Updated Date: 2025-01-16T08:19:00Z
Creation Date: 2016-01-15T13:48:22Z
Registry Expiry Date: 2026-01-15T13:48:22Z
Registrar: NameSilo, LLC
Registrar IANA ID: 1479
Registrar Abuse Contact Email: [email protected]
Registrar Abuse Contact Phone: +1.4805240066
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Name Server: HERA.NS.CLOUDFLARE.COM
Name Server: LOU.NS.CLOUDFLARE.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2025-05-02T00:52:29Z <<<
For more information on Whois status codes, please visit https://icann.org/epp
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