DNS Gurus
Cached · just now
95/100 SECURITY SCORE

Detected Technologies

See all in URL Inspect 3
Let's Encrypt logo Let's Encrypt hCaptcha logo hCaptcha Sentry logo Sentry

Certificate Information

Subject
CN=*.fastmail.com
Issuer
C=US, O=Let's Encrypt, CN=YR2
Valid From
July 14, 2026
Valid Until
October 12, 2026 77 days
Public Key
RSA 2048 bit Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
31:3F:63:94:E1:2D:61:87:E7:20:53:29:98:7B:0A:E8:19:E6:2F:17:27:74:60:7F:21:34:F3:A9:4B:4E:52:50
Alternative Names
11 domains

Security Configuration

TLS Protocols
TLS 1.2 TLS 1.3
Forward Secrecy
Supported (Modern clients use PFS)

HTTP Security Headers

Status
Strict-Transport-Security
Excellent
max-age=31536000; includeSubDomains; preload
Content-Security-Policy
hCaptcha logo
Good
default-src; connect-src; img-src; +11 more Analyze
Content-Security-Policy-Report-Only
Missing
Not configured Analyze
X-Frame-Options
Excellent
DENY
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Present
same-origin
Permissions-Policy
Present
accelerometer=(), ambient-light-sensor=(), camera=(); +10 more
Recommendations
  • • Strengthen CSP by removing 'unsafe-eval'

CAA Records (Certificate Authority Authorization)

CAA Records
Not Configured (Any CA can issue certificates)
CAA Issues
  • • No CAA records configured - any CA can issue certificates
Recommendations
  • • Implement CAA records to restrict which CAs can issue certificates for your domain
  • • This adds an extra layer of security against unauthorized certificate issuance
  • • Example: Add CAA record 'example.com. CAA 0 issue "letsencrypt.org"'
  • • Consider adding 'iodef' record to receive security incident reports