DNS Gurus
Cached · just now
91/100 SECURITY SCORE

Certificate Information

Subject
C=US, ST=WA, L=Redmond, O=Microsoft Corporation, CN=portal.office.com
Issuer
C=US, O=Microsoft Corporation, CN=Microsoft TLS G2 RSA CA OCSP 10
Valid From
July 18, 2026
Valid Until
February 01, 2027 180 days
Public Key
RSA 2048 bit Adequate
Signature Algorithm
SHA384-RSA
SHA-256 Fingerprint
D3:41:2D:A7:BA:6E:87:09:30:4E:BA:C3:90:FE:8B:C2:4D:BD:CA:2B:22:25:99:38:E1:E4:1C:67:91:2D:5D:C8
Alternative Names
22 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
Good
max-age=31536000; includeSubDomains
Content-Security-Policy
Strong
upgrade-insecure-requests; default-src; img-src; +10 more Analyze
Content-Security-Policy-Report-Only
Missing
Not configured Analyze
X-Frame-Options
Good
SAMEORIGIN
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Missing
Not configured
Permissions-Policy
Missing
Not configured
Recommendations
  • • Consider adding 'preload' to HSTS for maximum security
  • • Add Referrer-Policy header (recommended: strict-origin-when-cross-origin)
  • • Consider adding Permissions-Policy to control browser features

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