Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.BTLS Certificate Expiry & Recommendations157 days until leaf cert expires — 2 issues to addressREVIEW
Certificate validity
Recommended actions
- Submit your domain to hstspreload.org to be added to the Chrome preload list
- Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
BCDN & DeliveryGoogle Cloud CDNREVIEW
ADNS Records1 A records, 112 ms lookupPASS
| A | 34.107.134.59 |
| AAAA | 2600:1901:0:c831:: |
| CNAME | — |
| NS | — |
| MX | — |
| TXT | — |
| 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.
SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.
Without SPF, receiving servers can't validate sending IPs — your domain is easier to spoof in phishing.
Learn more ▾ ▴
SPF complements DMARC. Both should be published. SPF records list authorized sending IPs (e.g., `v=spf1 include:_spf.google.com ~all` for Google Workspace). After publishing, verify in Google Postmaster Tools or mxtoolbox.
Source: RFC 7208 (SPF)
A+Redirect ChainNo redirects — direct accessPASS
https://pubmed.ncbi.nlm.nih.gov
204 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://pubmed.ncbi.nlm.nih.gov | 200 | 204 ms | HTTP/1.1 | nginx |
A+IPv6 ReadinessIPv6 reachable (17 ms)PASS
A+Crawlabilityrobots.txt present, sitemap with 0 URLsPASS
User-agent: *
Crawl-delay: 1
Disallow: /api
Disallow: /rss
Disallow: /advanced/adv-suggestions/
Disallow: /terms/
Disallow: /addToHistory/
Disallow: /deleteHistory/
Disallow: /downloadHistory/
Disallow: /deleteHistoryRecord/
Disallow: /historyCacheExists/
Disallow: /*/references/
Disallow: /*/citations/
Disallow: /*/export/
Disallow: /*/citedby/
Disallow: /*/similar/
Disallow: /*/adj-nav/
Disallow: /ajax/
Disallow: /clipboard/
Disallow: /clipboard-next-page/
Disallow: /health/
Disallow: /deep-health-abstract/
Disallow: /deep-health-search/
Disallow: /deep-health-auth/
Disallow: /error/400/
Disallow: /error/403/
Disallow: /error/404/
Disallow: /error/500/
Disallow: /results-export-ids/
Disallow: /results-export-search-data/
Disallow: /results-export-email-by-search-data/
Disallow: /results-export-search-by-year/
Disallow: /send-email/
Disallow: /list-existing-collections/
Disallow: /add-to-existing-collection/
Disallow: /create-and-add-to-new-collection/
Disallow: /toggle-favorites-collection/
Disallow: /list-bibliography-delegates/
Disallow: /add-to-bibliography/
Disallow: /create-saved-search/
Disallow: /create-rss-feed-url/
Disallow: /searches/
Disallow: /collections/
Disallow: /more/
Disallow: /suggestions/
Disallow: /try-search-term/
Disallow: /rss-feed/
Sitemap: https://pubmed.ncbi.nlm.nih.gov/sitemap?p=index.xml
A+URL Variantswww/non-www, trailing slash, HTTP→HTTPSPASS
www / non-www
Preferred variant: non-www
HTTP → HTTPS
Consistent
A+Domain Intelligencenih.gov — via get.gov, 28 years, 11 months old, hosted on NIH-NET - National Institutes of Health, USPASS
39 days
August 22, 2026
157 days
Issued by GoDaddy.com, Inc.
28 years, 11 months
Registered October 2, 1997
Enabled
Protects against DNS spoofing
NIH-NET - National Institutes of Health, US
ASN AS3527
156.40.212.210
get.gov
Expiry timeline
Recommended actions
- Renew the domain or enable auto-renewal to prevent accidental expiry
- Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
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