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https://vercel.com

Infrastructure

· 17 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
90
GRADE
A
FIX
0
REVIEW
4
PASS
13
INFO
0
Probed from Madrid, Spain
200 OK
Checks
17
13 PASS 4 REVIEW
B
DNSSEC
Unsigned (DNSSEC not deployed)
REVIEW
Unsigned (DNSSEC not deployed)
Info::
DNSSEC is not deployed
The zone is not DNSSEC-signed. Users on validating resolvers (Cloudflare 1.1.1.1, Quad9 9.9.9.9, growing default in mobile resolvers) get no protection against DNS spoofing for this domain. Most registrars now offer DNSSEC at a single click; consider enabling it for sites where authenticity matters (banking, healthcare, government).
C
Reverse DNS
Action
0/2 IPs match cert SAN
REVIEW
0/2 IPs match cert SAN
Info::
PTR lookup failed for 64.239.109.193: lookup 64.239.109.193: no such host
No reverse DNS record set for this IP. Common on bare cloud-VM IPs without provider-side PTR; not a security issue.
Info::
PTR lookup failed for 64.239.123.193: lookup 64.239.123.193: no such host
No reverse DNS record set for this IP. Common on bare cloud-VM IPs without provider-side PTR; not a security issue.
C
IPv6 Readiness
Action
No IPv6 support
REVIEW
No IPv6 support
Info::
No IPv6 (AAAA) records found
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No IPv6 Support
About 40% of internet users have IPv6. Consider adding AAAA records.

IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.

Why this matters

No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.

Source: Google IPv6 stats

B
TLS Certificate Expiry & Recommendations
55 days until leaf cert expires — 2 issues to address
REVIEW

Certificate validity

55
days left
0d 30d 60d 90d+

Recommended actions

  • 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+
DNS Records
2 A records, 73 ms lookup
PASS
2 A records, 73 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 64.239.109.193, 64.239.123.193
Info::
No IPv6 (AAAA) records
Info::
2 nameserver(s) configured
Got: ns1.vercel-dns.com, ns2.vercel-dns.com
Info::
5 mail exchanger(s) configured
Info::
SPF record present in TXT
Info::
DNS resolution time: 73 ms
Got: 73 ms
A64.239.109.193, 64.239.123.193
AAAA—
CNAME—
NSns1.vercel-dns.com, ns2.vercel-dns.com
MX
1 aspmx.l.google.com
5 alt2.aspmx.l.google.com
5 alt1.aspmx.l.google.com
10 aspmx2.googlemail.com
10 aspmx3.googlemail.com
TXT
_k57cawuboit4hp2k6rv5bjbxuvkznwp
notion_verify_82^tYP%}6Q65dbszXu>V?@~stLe]Cm3Dmn8rqe7DZgT1m3o!+PyEbv+Jx04rb%v67B...
_saml-domain-challenge=1b4981f2-76a2-401f-8f09-a261a97099af
stripe-verification=8ff198a026ba2920fd8f4e45bcc499573d1a342596c6f0f18f3eae226bb8...
MS=ms81951275
apple-domain-verification=80dYVZTf3bf7C8H5
remote-domain-verification=8be9341d-2ab7-4de7-a26f-68c6af2b30ac
openai-domain-verification=dv-RrobMXwsu06yBo22YAOsZdxP
anthropic-domain-verification-08hmep=rIoWryrKgeXgTzXsASQqNA99q
SFMC-JchuOOQGseLonwnFdKq2xDV5UnqnvJRjMKyh7rwz
SPF v=spf1 include:_netblocks.google.com include:_netblocks2.google.com include:_net...
serval-domain-verification-40ct5x=VbdjZnWHkRJwpBE0IwXuriy03
box-domain-verification=968b9e475ce3f9a3bf3a2436eed2cd67082d8312f5e6559eaa7e1d15...
C575019D1B
mixpanel-domain-verify=3069307c-7d73-4581-880a-1b61267d06cb
stripe-verification=69ef655819f74eb6f93f9f7388273112ee8c2439b35502785239d3bf076a...
carta-domain-verification-wnnawd=jFGjeToDS0JE6iRBOq79AjxaD
gather-domain-verification=911fa583-4323-4bc7-9a43-a29ae4a6003e
ahrefs-site-verification_774361e47cac589ba5ff743f90399b1e5792980bd22f0f4c56bfb1e...
ZOOM_verify_iAqiiWW1TdK-GwbJI7qn1g
amp-by-sourcegraph-domain-verification-st5f9e=172nCAgVw3POSEMQGXOv24XWO
h1-domain-verification=DmNbUeH65JZUKDLixLxWCEfvFiJcCP6sSR3ymQ3MamqmMN2K
docusign=8a27eabb-2ba5-4820-a148-36b0ac9f592b
_visual-studio-marketplace-vercel.vercel.com:4fe5630e-b256-4d57-9e03-88abeab96b3...
cursor-domain-verification-f3eygw=YMP9VK0KY2xhJrRKFMpkkyhv1
loom-verification=5698251381
plain-domain-verification-vkhaan=eY1PYorYjiTuIxRpcsIDKi19X
whimsical=34ebc92242a47d7e9a6ae5f42f60ad80fccbf094
doordash-verification=kA2ozHfLLU2lEpqQVmJO7DRKwZArKO
google-site-verification=J9NjkBE_oybWpa-OHAkV0VjSjIvIBMfp83tdsQCzxK8
docusign=589bb007-2665-4084-b839-9874df0da0cf
stripe-verification=923c7c6074dc94f4b22136b4236a1dc5433a3276b5fc981799771f781d7a...
stripe-verification=D353787AECFE3E8DF14A07DF171A7A0529DB83B8D7CD0C5FD89A9C42A255...
v=MCPv1; k=ed25519; p=53H31Wxaf08fBk8IOIjlWrxy4pK9KGrLRVSB8WSu8rY=
stripe-verification=e6c56a2c1de7a8a001d69362c33e8ee39536606dae859f9e5fef982ecd10...
CAALookup not available with standard resolver
Resolved in 73 ms
A+
Subdomain Takeover
No subdomain takeover risk detected
PASS
No subdomain takeover risk detected
Info::
No CNAME record present
A
CAA Records
issue: letsencrypt.org, globalsign.com, sectigo.com, pki.goog
PASS
issue: letsencrypt.org, globalsign.com, sectigo.com, pki.goog
Info::
CAA issue tag present — authorized CA(s): letsencrypt.org, globalsign.com, sectigo.com, pki.goog
Info::
No CAA iodef tag — won't be notified of failed issuance attempts
Add `0 iodef "mailto:security@example.com"` to receive notifications when a CA refuses issuance because it doesn't match your CAA policy. Useful signal for detecting issuance attempts by unauthorized CAs.
A+
Multi-Resolver DNS Speed
Mean 10ms across 3 resolvers (spread 16ms)
PASS
Mean 10ms across 3 resolvers (spread 16ms)
Info::
Quad9: 0ms
Got: 0ms via 9.9.9.9:53
Info::
Google: 16ms
Got: 16ms via 8.8.8.8:53
Info::
Cloudflare: 16ms
Got: 16ms via 1.1.1.1:53
A+
Redirect Chain
No redirects — direct access
PASS
No redirects — direct access
Info::
No redirects — direct access
Got: https://vercel.com

https://vercel.com

93 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://vercel.com20093 msHTTP/1.1Vercel
A+
Crawlability
robots.txt present, sitemap with 6403 URLs
PASS
robots.txt present, sitemap with 6403 URLs
Info::
robots.txt is present
Got: 629 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 6403 entries
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 629 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
User-Agent: *
Content-Signal: search=yes, ai-input=yes, ai-train=no

# Allow robots to be able to crawl the OG Image API route and all the subpaths
Allow: /api/og/*
Allow: /api/docs-og*
Allow: /api/product-og*
Allow: /api/dynamic-og*
Allow: /api/model-og*
Allow: /api/www/avatar/*

Disallow:
Disallow: /api/
Disallow: /oauth
Disallow: /confirm
Disallow: /notifications
Disallow: /old-browser.html
Disallow: /preauthorize
Disallow: /signup?*
Disallow: /invites/
# No-index author pages (direct URL only, also marked noindex/nofollow)
Disallow: /blog/authors
Disallow: /changelog/authors



Sitemap: https://vercel.com/sitemap.xml
sitemap.xml 200 OK
Type URL Set URLs 6403 entries Valid XML Yes
Sample URLs:
A+
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
PASS
www/non-www, trailing slash, HTTP→HTTPS
Info::
HTTP correctly redirects to HTTPS permanently
Got: HTTP 308

www / non-www

308https://www.vercel.com/
200https://vercel.com/

HTTP → HTTPS

308http://vercel.com/ → https://vercel.com/

Consistent

A+
Domain Intelligence
vercel.com — via Amazon Registrar, Inc., 27 years, 3 months old, hosted on AWS
PASS
vercel.com — via Amazon Registrar, Inc., 27 years, 3 months old, hosted on AWS
Info::
Domain registered until Oct 4, 2029 (3 years, 1 months remaining)
Info::
DNSSEC is not enabled
DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
Info::
Registrar: Amazon Registrar, Inc.
Warning::
Registrar lock is NOT enabled
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.
Info::
Hosting: AWS
Got: AS16509
Domain expiry

1133 days

October 4, 2029

SSL certificate

55 days

Issued by Let's Encrypt

Domain age

27 years, 3 months

Registered October 4, 1999

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

AWS

ASN AS16509

64.239.109.193

Registrar

Amazon Registrar, Inc.

Unlocked 4 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable DNSSEC to protect visitors from DNS spoofing
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar Amazon Registrar, Inc.
Created October 4, 1999 (27 years, 3 months ago)
Expires October 4, 2029 (3 years, 1 months)
Last Updated May 16, 2026
Name Servers a.zeit-world.co.uk, b.zeit-world.org, e.zeit-world.com, f.zeit-world.net
DNSSEC Not enabled
Hosting
IP Address 64.239.109.193
ASN AS16509 (AMAZON-02 - Amazon.com, Inc., US)
Provider AWS
Data source: rdap (0.3s)

DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.

Why this matters

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.

Why this matters

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

A+
HTTP Probe Timing
Total 95 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
18 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
1 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
37 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
92 ms
Total Time Total request time from DNS lookup through full response.
95 ms

Connection waterfall

DNS Lookup 18 ms TCP Connect 1 ms TLS Handshake 37 ms Server Processing 37 ms Content Transfer 4 ms
A+
CDN & Delivery
Vercel (HIT)
PASS
Vercel (HIT)
Info::
Site is served via Vercel CDN
Got: x-vercel-id: cdg1::88t4d-1787838039552-dffaa133ea78
Info::
CDN cache status: HIT
CDN Detected: Vercel
Provider Vercel Cache Status HIT Evidence x-vercel-id: cdg1::88t4d-1787838039552-dffaa133ea78
A+
CDN Cache Observability
Cache state: HIT
PASS
Cache state: HIT
Info::
CDN cache state observable via 2 header(s)
Got: age=876, x-vercel-cache=HIT
A+
Operational Status Page
Status page detected via anchor text
PASS
Status page detected via anchor text
Info::
Status page link found: https://vercel-status.com
Got: https://vercel-status.com
A+
Health Check Endpoint
Health endpoint at https://vercel.com/health (HTTP 200)
PASS
Health endpoint at https://vercel.com/health (HTTP 200)
Info::
Public health endpoint at https://vercel.com/health
Got: https://vercel.com/health
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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