Guest session
Check Detail

gmail.com · DNS

Passed Grade A
100.0%
Hostname gmail.com
Check name DNS
last run 08/04/2026 11:46
Result
Incomplete Grade B 75.6%

Result Detail

DNS
Host Type Answer TTL
142.251.20.17 —
142.251.20.18 —
142.251.20.83 —
142.251.20.19 —
2a00:1450:4001:c25::11 —
2a00:1450:4001:c25::13 —
2a00:1450:4001:c25::12 —
2a00:1450:4001:c25::53 —

Result Detail

HEADER
Alerts
  • Strict-Transport-Security: Strict-Transport-Security missing
  • Content-Security-Policy: Content-Security-Policy missing
  • X-Frame-Options: Header missing
  • Referrer-Policy: Header missing
  • Permissions-Policy: Permissions-Policy missing
  • Cross-Origin-Opener-Policy: Header missing
  • Cross-Origin-Embedder-Policy: Header missing
  • Cross-Origin-Resource-Policy: Unexpected value
  • Expect-CT: Expect-CT missing
  • X-Permitted-Cross-Domain-Policies: Header missing
  • Access-Control-Allow-Origin: Access-Control-Allow-Origin missing
  • Server: Sensitive header exposed
  • Origin-Agent-Cluster: Header missing
Normalized headers
location https://mail.google.com/mail/u/0/
cross-origin-resource-policy cross-origin
x-content-type-options nosniff
server sffe
content-length 230
x-xss-protection 0
date Wed, 08 Apr 2026 09:26:50 GMT
expires Wed, 08 Apr 2026 09:56:50 GMT
cache-control public, max-age=1800
content-type text/html; charset=UTF-8
age 1157
alt-svc clear
Transport
Check name Status Actual Expected Detail Severity Recommendation
Strict-Transport-Security ❌ Missing max-age>=15768000; includeSubDomains; preload Strict-Transport-Security missing Critical Strict-Transport-Security: max-age=63072000; includeSubDomains; preload
Expect-CT ❌ Missing enforce; max-age>=86400 Expect-CT missing Medium Expect-CT: enforce, max-age=86400, report-uri="https://report.example.com"
Content Security
Check name Status Actual Expected Detail Severity Recommendation
Content-Security-Policy ❌ Missing default-src 'self'; frame-ancestors 'none' Content-Security-Policy missing Critical Content-Security-Policy: default-src 'self'; frame-ancestors 'none'
MIME
Check name Status Actual Expected Detail Severity Recommendation
X-Content-Type-Options ✅ Passed nosniff nosniff Value matches recommendation High X-Content-Type-Options: nosniff
Framing
Check name Status Actual Expected Detail Severity Recommendation
X-Frame-Options ❌ Missing DENY or SAMEORIGIN Header missing High X-Frame-Options: DENY
Privacy
Check name Status Actual Expected Detail Severity Recommendation
Referrer-Policy ❌ Missing strict-origin-when-cross-origin / same-origin Header missing Medium Referrer-Policy: strict-origin-when-cross-origin
Browser Features
Check name Status Actual Expected Detail Severity Recommendation
Permissions-Policy ❌ Missing camera=(); geolocation=(); microphone=() Permissions-Policy missing Medium Permissions-Policy: camera=(), geolocation=(), microphone=()
Cross-Origin
Check name Status Actual Expected Detail Severity Recommendation
Cross-Origin-Opener-Policy ❌ Missing same-origin Header missing High Cross-Origin-Opener-Policy: same-origin
Cross-Origin-Embedder-Policy ❌ Missing require-corp Header missing High Cross-Origin-Embedder-Policy: require-corp
Cross-Origin-Resource-Policy ❌ Missing cross-origin same-origin Unexpected value Medium Cross-Origin-Resource-Policy: same-origin
Origin-Agent-Cluster ❌ Missing ?1 Header missing Low Origin-Agent-Cluster: ?1
Caching
Check name Status Actual Expected Detail Severity Recommendation
Cache-Control ✅ Passed public, max-age=1800 no-store, private, max-age=0 no-store, private, max-age=0 High Cache-Control: no-store, private, max-age=0
Legacy
Check name Status Actual Expected Detail Severity Recommendation
X-Permitted-Cross-Domain-Policies ❌ Missing none Header missing Low X-Permitted-Cross-Domain-Policies: none
CORS
Check name Status Actual Expected Detail Severity Recommendation
Access-Control-Allow-Origin ❌ Missing Scoped origin (no wildcard) Access-Control-Allow-Origin missing Medium Access-Control-Allow-Origin: https://app.example.com
Information Disclosure
Check name Status Actual Expected Detail Severity Recommendation
Server ❌ Missing sffe Header removed or generic Sensitive header exposed High Remove Server header or set to a generic token
X-Powered-By ✅ Passed Header removed Header not exposed High Remove X-Powered-By header
X-AspNet-Version ✅ Passed Header removed Header not exposed Medium Remove framework version headers
Raw headers
HTTP/2 301 
location: https://mail.google.com/mail/u/0/
cross-origin-resource-policy: cross-origin
x-content-type-options: nosniff
server: sffe
content-length: 230
x-xss-protection: 0
date: Wed, 08 Apr 2026 09:26:50 GMT
expires: Wed, 08 Apr 2026 09:56:50 GMT
cache-control: public, max-age=1800
content-type: text/html; charset=UTF-8
age: 1157
alt-svc: clear

Result Detail

SSL
Check name Status Value
certificate chain is complete ✅ Passed 4
root CA is trusted ✅ Passed Trusted
cert valid for ✅ Passed 61
chain certs are valid until ✅ Passed 08.06.2026
CN matches Domainname ✅ Passed gmail.com
certificate subject ✅ Passed CN=gmail.com
certificate issuer ✅ Passed C=US, O=Google Trust Services, CN=WE2
signature algorithm ✅ Passed ecdsa-with-SHA256
TLS protocol ✅ Passed TLSv1.3 TLS_AES_256_GCM_SHA384
Subject Alternative Names ✅ Passed gmail.com, *.gmail.com
Public Key ✅ Passed EC 256
Certificate chain
# Common name Issuer Valid until CA
0 gmail.com C=US, O=Google Trust Services, CN=WE2 08.06.2026 10:38:56 No
1 gmail.com C=US, O=Google Trust Services, CN=WE2 08.06.2026 10:38:56 No
2 WE2 C=US, O=Google Trust Services LLC, CN=GTS Root R4 20.02.2029 15:00:00 Yes
3 GTS Root R4 C=BE, O=GlobalSign nv-sa, OU=Root CA, CN=GlobalSign Root CA 28.01.2028 01:00:42 Yes
TLS details
Negotiated protocol TLSv1.3
Cipher suite TLS_AES_256_GCM_SHA384 (256 bit)
Cipher version TLSv1.3
Perfect Forward Secrecy Attention
Earliest chain expiry 08.06.2026 10:38
Fingerprints
SHA-256 58:73:11:76:B6:D5:DF:D2:4E:04:4B:D4:9F:11:F2:B4:3B:08:49:DC:AE:8B:B3:B1:49:89:45:BC:7A:F2:69:2B
SHA-1 F4:2D:AB:26:C2:DE:67:87:99:2B:2C:CF:08:13:66:08:21:C3:8C:0B
Revocation
OCSP URLs
http://o.pki.goog/we2
CRL URLs
Full Name: URI:http://c.pki.goog/we2/yK5nPhtHKQs.crl
Issuer URLs (AIA)
http://i.pki.goog/we2.crt
OCSP Must-Staple No
Trust evaluation

Attempted: Yes

Trusted: Yes

OpenSSL diagnostic command
openssl s_client -connect gmail.com:443 -servername gmail.com

Result Detail

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