Cybersecurity Rating
by ImmuniWeb® CyberScore™

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  • Website Security Rating
  • Website Privacy Rating
  • Encryption Security Rating
  • Email Security Rating
  • GenAI Exposure Rating
  • Dark Web Exposure
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63,079 organizations tested
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21
tests
running
667
tests
in 24 hours
tests in 24 hours

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Cybersecurity Rating of costco.com

Website
Security Rating: B+
Website
Privacy Rating: A-
SSL
Security Rating: A
Email
Security Rating: A
GenAI
Exposure Rating: A+
Tested on November 6th, 2026 21:05 GMT+0
Website Security:Tests Finished
Website Privacy:Tests Finished
SSL Security:Tests Finished
Email Security:Test Finished
GenAI Exposure:Test Finished

Website Security Rating | Overview

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The total number of subdomains is capped at 50.

HostnameURLGradeTested on
costco.comhttps://www.costco.com/CNovember 6th, 2026 21:13
www.costco.comhttps://www.costco.com/CNovember 6th, 2026 21:21
smetrics.costco.comhttps://smetrics.costco.com/ANovember 6th, 2026 21:15
adbutler.costco.comhttps://adbutler.costco.com/ANovember 6th, 2026 21:15
my.costco.comhttps://my.costco.com/ANovember 6th, 2026 21:16
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Website Privacy Rating | Overview

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The total number of subdomains is capped at 50.

HostnameURLGradeTested on
costco.comhttps://www.costco.com/A+November 6th, 2026 21:44
www.costco.comhttps://www.costco.com/A+November 6th, 2026 21:44
smetrics.costco.comhttps://smetrics.costco.com/A+November 6th, 2026 21:44
adbutler.costco.comhttps://adbutler.costco.com/BNovember 6th, 2026 21:44
my.costco.comhttps://my.costco.com/A+November 6th, 2026 21:44
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SSL Security Rating | Overview

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The total number of subdomains is capped at 50.

HostnameURLProtocolGradeTested on
costco.comhttps://costco.com
151.101.3.52:443		HTTPSA+November 6th, 2026 21:09
www.costco.comhttps://www.costco.com
151.101.139.52:443		HTTPSNNovember 6th, 2026 21:09
smetrics.costco.comhttps://smetrics.costco.com
63.140.39.146:443		HTTPSANovember 6th, 2026 21:15
adbutler.costco.comhttps://adbutler.costco.com
40.160.21.45:443		HTTPSA+November 6th, 2026 21:16
my.costco.comhttps://my.costco.com
151.101.139.52:443		HTTPSA+November 6th, 2026 21:15
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Email Security Rating | Overview

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HostnameGradeTested on
costco.comANovember 6th, 2026 21:11
  • Email Server Security Report
    A total of 2 email servers were analyzed. Open relay was not detected, SMTP enumeration was not detected, a secure authentication was enforced across all tested servers, and PTR records were properly configured. The average response latency was approximately 0.048s.
  • Email SSL/TLS Encryption Report
    SSL/TLS security testing could not be completed for the analyzed email servers.
  • Email Server DNS Security Report
    SPF is set with issues, DKIM is set properly, and DMARC is set properly. MTA-STS is not configured for this domain.
  • Email Server Black and Spam Lists Report
    No email servers were found on blacklists.
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GenAI Exposure Rating

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  • No vibe-coded or AI-created code patterns detected across 51 websites.
  • No leaks of AI tokens or other AI-related and sensitive data detected on the Dark Web.
  • No leaks of AI tokens or other AI-related and sensitive data detected across 51 websites.

Dark Web and Threat Exposure Rating | Overview

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HostnameTested on
costco.comNovember 6th, 2026 21:07
  • Dark Web Exposure Report
    No dark web incidents found.
  • Unprotected Cloud Storage Report
    A total of 43 buckets detected across 3 cloud storage providers, including 2 public buckets and containing 69 publicly accessible files: 22 buckets were detected in Amazon S3, including 2 public buckets and containing 69 publicly accessible files; 8 buckets were detected in Azure Storage; 13 buckets were detected in Google Cloud Storage.
  • Phishing Websites Report
    No potential phishing websites found.
  • Cybersquatting Domains Report
    No potential cybersquatting domains found.
  • Typosquatting Domains Report
    No potential typosquatting domains found.
  • Fake Accounts in Social Media Report
    No squatted social network accounts found.
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