Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.CIPv6 ReadinessActionNo IPv6 supportREVIEW
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.
Source: Google IPv6 stats
BCrawlabilityno robots.txt, no sitemapREVIEW
robots.txt is optional but recommended. It tells search engine crawlers which pages to index.
No robots.txt — crawlers fetch /robots.txt and get 404; not breaking but means default crawl behavior with no directives or sitemap reference.
Learn more ▾ ▴
A minimal robots.txt with `User-agent: * / Allow: / / Sitemap: https://example.com/sitemap.xml` covers the basics. Without it, crawlers behave fine but lose the sitemap signal and can't be selectively blocked from crawl-traps.
Source: robotstxt.org
A sitemap helps search engines discover and index your pages more efficiently.
No sitemap.xml — Google relies on crawl-graph discovery alone, slowing indexing of deep or fresh URLs.
Learn more ▾ ▴
A sitemap accelerates Google's discovery of new and updated content. Most CMSes auto-generate one; static-site frameworks need a build-step plugin. Reference it from robots.txt and submit in Search Console to confirm Google can fetch it.
Source: sitemaps.org / Google Search Central
No robots.txt found
This is fine for most sites — a missing robots.txt allows all crawling by default.
No sitemap found
Adding a sitemap helps search engines discover your pages.
BTLS Certificate Expiry & Recommendations144 days until leaf cert expires — 5 issues to addressREVIEW
Certificate validity
Recommended actions
- Extend HSTS max-age to at least 31536000 (1 year) to meet the preload list criteria
- Add includeSubDomains to the HSTS directive
- Add the preload directive and submit to hstspreload.org once max-age + includeSubDomains are in place
- Enable DNSSEC on your domain for DNS spoofing protection
- Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
BCDN & DeliveryAkamaiREVIEW
A+DNS Records1 A records, 18 ms lookupPASS
| A | 23.56.210.23 |
| AAAA | — |
| CNAME | — |
| NS | a6-64.akam.net, a5-64.akam.net, a1-116.akam.net, a14-67.akam.net, a9-66.akam.net, a28-66.akam.net |
| MX | 10 mx0b-001f9d01.pphosted.com 10 mx0a-001f9d01.pphosted.com |
| TXT | VmwCafXLaizwh4cfQPdy flexera-domain-verification-mddzccpcqcdbeuih d4c2e4a3297fe25a71d030b67eb83bfc google-site-verification=3Kx9tc2_v5CgX3NuVqNwWFZRYanPPJCP3__8KbRxn5Q onx=58b94d97-109f-4db2-98cf-5a1c93395b4d dtm-domain-verification=RvQ3bIbvQAeeMHbrXwHbtfcU-Z8WGxW6tBQQFfdpIvA SPF v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com -all onetrust-domain-verification=e62749d1cc3549bea14bacad4cd8215f onx=2d96b540-bcd6-4410-813c-d5e96ab635c5 vmware-cloud-verification-7161df13-1d90-4cbe-a1a9-0f29fc3e9ffc d3958bd3-ebec-43fc-8b73-53355efdf2f6.costco.com Dynatrace-site-verification=85537782-cedf-4d0d-9b24-3126f2ae1dcb__87kk52lv2c0qrp... have-i-been-pwned-verification=7411effeb11c12300a4c027396b4cf0f facebook-domain-verification=46if6nzbzbffbhikh3uq8sye7ez5bg google-site-verification=_UMsl36liAGjRl5ldvmM5bK7YCzP_z19C522LsS_6Z4 intersight=c7f5c84fa7c1559a23ae37f0a45aa2806cc1b09291dfe94ffa5c775b65feb280 adobe-idp-site-verification=ae9e3f0f-2848-4000-aed4-e1c7e8031815 docusign=3e51deb4-b2f9-46ef-b120-18f6955ebce1 onx=efbf8ab1-7e83-4416-85a4-711586edb47c google-site-verification=XGHXzaAnl-HmYsIW4QB-l4aaHMgJyBHqcT3Jc8SB2BY postman-domain-verification=a5e9b1c7145c22a192ff089eb9c140d4a589b99d7763b87483c2... ms-domain-verification=2d5e7430-b403-4b17-a1df-4cb3eee9967b a3a34ae6-fccb-4452-9105-cb31f5348086 atlassian-domain-verification=mOyfCnOmDOAo2wCWxZ1feSqlR3yeXX6nP2KotAWqkWWtO1NAJy... MS=ms45356090 ciscocidomainverification=778c9d75e8b6fdb7dc3f095b677d08d21ececebe8462cb691c377e... docusign=4db9a87a-9dea-417f-bfaa-d45bf7c94291 flexera-domain-verification-bazgmhadwejbbgdq google-site-verification=dffTnhrKhs3V5-UUHvEYJg-RNLJjBz27jCBqmF6sX_E onetrust-domain-verification=0cc4aa566b3f4d3d9f5f03bc7cfd73c4 |
| CAA | Lookup not available with standard resolver |
Multiple A records provide failover if one server goes down.
Single A record means a single point of failure — if that IP goes down, your site is unreachable until DNS TTL expires.
Learn more ▾ ▴
Add multiple A records for round-robin failover, or use a managed DNS provider with health-checked failover (Route 53, Cloudflare, NS1). Short TTL (60-300s) lets clients recover faster on outages.
Source: SRE practice / DNS architecture
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.
A+Redirect Chain0 redirect(s), 11 ms totalPASS
https://costco.com
11 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://costco.com | 302 | 11 ms | HTTP/1.1 | AkamaiGHost |
If permanent, use 301 instead.
302 (Found) is for genuinely temporary redirects — if this redirect is permanent, switch to 301 to preserve SEO equity.
Learn more ▾ ▴
Search engines treat 302 as temporary, keeping the original URL indexed and not transferring full link equity to the destination. Use 301 (Moved Permanently) for permanent redirects (HTTP→HTTPS, www-vs-non-www, URL restructures).
Source: Google Search Central
AURL Variantswww/non-www, trailing slash, HTTP→HTTPSPASS
www / non-www
HTTP → HTTPS
Use 301 (permanent) instead of 302 (temporary)
A+Domain Intelligencecostco.com — via CSC Corporate Domains, Inc., 29 years, 6 months old, hosted on AkamaiPASS
248 days
March 18, 2027
144 days
Issued by DigiCert Inc
29 years, 6 months
Registered March 17, 1997
Not enabled
Protects against DNS spoofing
Akamai
ASN AS16625
23.197.46.98
CSC Corporate Domains, Inc.
Expiry timeline
Recommended actions
- Enable DNSSEC to protect visitors from DNS spoofing
- Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
Without DNSSEC, an attacker who can poison your DNS can hijack your domain — and SSL certs alone don't stop them.
Learn more ▾ ▴
DNSSEC adds cryptographic signatures to DNS records, preventing forged responses from poisoning resolver caches. Without it, an attacker who controls the network path can redirect your domain to a malicious server before any HTTPS handshake happens. Most modern registrars (Cloudflare, Google Domains, Route 53) enable it with one toggle.
Source: ICANN / RFC 4033
The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.
Without registrar lock, an attacker who phishes your registrar credentials can transfer the domain in minutes — total brand hijack.
Learn more ▾ ▴
Registrar lock (clientTransferProhibited, clientUpdateProhibited, clientDeleteProhibited) requires extra verification before any transfer/update/delete. Every major registrar offers it free. Combined with 2FA on your registrar account, it's the strongest defense against domain hijacking.
Source: ICANN / domain-security best practice