Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.BDNS Records2 A records, 26 ms lookupREVIEW
| A | 216.150.16.129, 216.150.1.129 |
| AAAA | — |
| CNAME | 4b9af6920c9c4c4c.vercel-dns-016.com |
| NS | — |
| MX | — |
| TXT | — |
| CAA | Lookup not available with standard resolver |
A CNAME at the zone apex can break MX and NS records. Use ALIAS/ANAME or A records instead.
CNAME at the apex (example.com) breaks every other apex record (MX, TXT, NS) — DNS-protocol violation per RFC 1034.
Learn more ▾ ▴
RFC 1034 forbids CNAME alongside other records at the same name. Some DNS providers offer ALIAS / ANAME / flattened-CNAME records that work around this — use those instead. Otherwise apex-level CNAME breaks email (no MX), domain ownership verification (no TXT), and more.
Source: RFC 1034
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)
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
CTLS Certificate Expiry & RecommendationsAction27 days until leaf cert expires — 4 issues to addressREVIEW
Certificate validity
Recommended actions
- Renew certificate — 27 days remaining
- Submit your domain to hstspreload.org to be added to the Chrome preload list
- 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
A+Redirect ChainNo redirects — direct accessPASS
https://www.prefect.io
82 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://www.prefect.io | 200 | 82 ms | HTTP/1.1 | Vercel |
A+Crawlabilityrobots.txt present, sitemap with 2 URLsPASS
User-Agent: *
Allow: /
Disallow: /api/
Disallow: /login
Disallow: /signup
Sitemap: https://www.prefect.io/sitemap-index.xml
AURL Variantswww/non-www, trailing slash, HTTP→HTTPSPASS
www / non-www
HTTP → HTTPS
Use 301 (permanent) instead of 302 (temporary)
A+Domain Intelligenceprefect.io — via Key-Systems GmbH, 9 years, 2 months old, hosted on AWSPASS
283 days
March 25, 2027
27 days
Issued by Let's Encrypt
9 years, 2 months
Registered March 25, 2017
Status unknown
Protects against DNS spoofing
AWS
ASN AS16509
216.150.1.1
Key-Systems GmbH
Expiry timeline
Recommended actions
- Renew the TLS certificate or verify auto-renewal is working