DNS Gurus
Cached · just now
79/100 SECURITY SCORE

Certificate Information

Subject
C=US, ST=WA, L=Redmond, O=Microsoft Corporation, CN=*.res.outlook.com
Issuer
C=US, O=Microsoft Corporation, CN=Microsoft TLS G2 ECC CA OCSP 02
Valid From
March 17, 2026
Valid Until
October 01, 2026 158 days
Public Key
ECDSA 256 bit (P-256) Adequate
Signature Algorithm
ECDSA-SHA384
SHA-256 Fingerprint
3F:8B:16:4A:25:81:CF:59:73:06:E7:09:CD:43:BF:EB:65:E1:CF:4F:FD:78:74:A8:D9:6C:9D:FF:51:BC:3F:E0
Alternative Names
69 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
Missing
Not configured Analyze
Content-Security-Policy-Report-Only
Missing
Not configured Analyze
X-Frame-Options
Missing
Not configured
X-Content-Type-Options
Missing
Not configured
Referrer-Policy
Missing
Not configured
Permissions-Policy
Missing
Not configured
Recommendations
  • • Consider adding 'preload' to HSTS for maximum security
  • • Add Content-Security-Policy header to prevent XSS attacks
  • • Add X-Frame-Options: DENY or SAMEORIGIN to prevent clickjacking
  • • Add X-Content-Type-Options: nosniff
  • • 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

Subject Alternative Names

69 domains
res-2-dev.cdn.officeppe.net res-dev.cdn.officeppe.net

Other domains in certificate

*.res.exchangelabs.com
*.res.live.com *.res.outlook.live.com
*.res.office.com
br-alt-failover-res-1.cdn.office.net br-alt-failover-res-2-dod.cdn.office.net br-alt-failover-res-2-gcc.cdn.office.net br-alt-failover-res-2-gcch.cdn.office.net br-failover-res-1.cdn.office.net br-failover-res-2-dod.cdn.office.net br-failover-res-2-gcc.cdn.office.net br-failover-res-2-gcch.cdn.office.net cdn.dev.fluidpreview.office.net cdn.fluidpreview.office.net *.dod.cdn.office.net fail404-res-1.cdn.office.net failover-res-1-sdf.cdn.office.net failover-res-1.cdn.office.net failover-res-2-dod.cdn.office.net failover-res-2-gcc.cdn.office.net failover-res-2-gcch.cdn.office.net *.gcc.cdn.office.net *.gcch.cdn.office.net m365-1.cdn.office.net *.mro1cdnstorage.dod.cdn.office.net *.mro1cdnstorage.gcc.cdn.office.net *.mro1cdnstorage.gcch.cdn.office.net *.mro1cdnstorage.public.cdn.office.net *.mro1cdnstorage.sdf.cdn.office.net outlook-1.cdn.office.net outlook-2.cdn.office.net *.public.cdn.office.net res-1-dod.cdn.office.net res-1-gcc.cdn.office.net res-1-gcch.cdn.office.net res-1-sdf-bucket1.cdn.office.net res-1-sdf.cdn.office.net res-1-tls.cdn.office.net res-1.cdn.office.net res-2-dod.cdn.office.net res-2-gcc.cdn.office.net res-2-gcch.cdn.office.net res-2-sdf.cdn.office.net res-2.cdn.office.net res-3-sdf-bucket1.cdn.office.net res-3-sdf.cdn.office.net res-3.cdn.office.net res-cn.cdn.office.net res-dod-h1.cdn.office.net res-dod.cdn.office.net res-gcc.cdn.office.net res-gcch-h1.cdn.office.net res-gcch.cdn.office.net res-geo.cdn.office.net res-h1.cdn.office.net res-sdf-cn.cdn.office.net res-sdf-geo.cdn.office.net res-sdf-h1.cdn.office.net res-sdf.cdn.office.net res-v-sdf-h1.cdn.office.net res-v-sdf.cdn.office.net res-v.cdn.office.net res-ww.cdn.office.net res.cdn.office.net *.sdf.cdn.office.net
*.res.office365.com
*.res.outlook.com