Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.DTLS Certificate Expiry & RecommendationsAction5 days until leaf cert expires — 6 issues to addressFIX
Certificate validity
Recommended actions
- Renew certificate — 5 days remaining
- Prefer TLS 1.3 — TLS 1.2 is acceptable but TLS 1.3 removes RSA key exchange and improves latency
- 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
DCDN & DeliveryActionNo CDN detectedFIX
Consider using a CDN to improve global delivery speed and reduce origin load.
BURL Variantswww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
Preferred variant: non-www
HTTP → HTTPS
HTTP version does not redirect to HTTPS
A+DNS Records1 A records, 17 ms lookupPASS
| A | 52.58.199.22 |
| AAAA | 2a05:d014:5c0:2600::6, 2a05:d014:5c0:2601::6 |
| CNAME | — |
| NS | ns1.f5clouddns.com, ns2.f5clouddns.com |
| MX | 10 mail.nginx.org |
| TXT | SPF v=spf1 ip4:206.251.255.60/30 ip4:94.130.165.194/32 ip4:206.251.255.64/31 ~all google-site-verification=FnbM63M8trsWPaAVXzpX1ycy4deAdB_OaXh694KtdFU |
| 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 ChainNo redirects — direct accessPASS
https://nginx.org
35 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://nginx.org | 200 | 35 ms | HTTP/1.1 | nginx/1.29.3 |
A+IPv6 ReadinessIPv6 reachable (7 ms)PASS
A+Crawlabilityrobots.txt present, sitemap with 359 URLsPASS
User-Agent: *
Disallow: /libxslt/
Sitemap: http://nginx.org/sitemap.xml
A+Domain Intelligencenginx.org — via CSC Corporate Domains, Inc., 21 years, 7 months oldPASS
163 days
December 23, 2026
5 days
Issued by Let's Encrypt
21 years, 7 months
Registered December 23, 2004
Not enabled
Protects against DNS spoofing
Unknown
2a05:d014:5c0:2600::6
CSC Corporate Domains, Inc.
Expiry timeline
Recommended actions
- Renew the TLS certificate or verify auto-renewal is working
- 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