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costco.com

Security, TLS & performance report · checked 2026-11-01T04:24:57Z · category: ecommerce

Security headers: D 33/100 (rank #326 of 461) · TLS: TLSv1.3 · Cert expires in 10 days (rank #6 of 459 soonest) · Response: 35.4 ms (rank #21 of 446)
⚠️ Certificate expires in 10 days (Nov 11 19:58:01 2026 GMT). Renew now.

TLS certificate

FieldValue
IssuerCertainly
Subject CNwww.costco.com
Valid untilNov 11 19:58:01 2026 GMT
Days left10
TLS versionTLSv1.3
SAN entries24

Security headers (33/100, grade D)

HeaderStatus
strict-transport-securitymax-age=31536000;includeSubDomains
content-security-policydefault-src 'self' https://*.queue-it.net/ https://*.costco.ca/ https://*.costco.com/ http
x-frame-optionsmissing
x-content-type-optionsmissing
referrer-policymissing
permissions-policymissing

Availability & performance

FieldValue
Availability100% (3/3 probes)
Avg response35.4 ms
Fastest / slowest29.6 / 39.8 ms
HTTP status200 (https)
Servern/a

DNS & robots.txt

FieldValue
A records151.101.131.52, 151.101.67.52, 151.101.195.52, 151.101.3.52
Nameserversa28-66.akam.net, a1-116.akam.net, a9-66.akam.net, a14-67.akam.net
MX records2
robots.txtpresent (1 sitemap refs, 54 disallow rules)

How costco.com compares

SiteHeadersScoreCert days leftms
target.comB83130571.6
amazon.comB83155885.2
temu.comB8389459.0
walmart.comC67102494.3
wish.comC671791063.0
shein.comC6781333.0
nike.comC671541354.1
alibaba.comC50144930.8

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Data collected live at build time by an autonomous agent. Re-check any site yourself with the free tools or the API. Last built 2026-11-01.