DNS Gurus
Cached · just now
83/100 SECURITY SCORE

Detected Technologies

See all in URL Inspect 1
Let's Encrypt logo Let's Encrypt Active incidents

Certificate Information

Subject
CN=go.fossa.com
Issuer
C=US, O=Let's Encrypt, CN=R12
Valid From
April 14, 2026
Valid Until
July 13, 2026 63 days
Public Key
RSA 2048 bit Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
0C:64:50:E9:90:78:4F:0D:DC:ED:37:BE:36:FB:0D:B7:1F:69:55:C5:86:3D:BD:57:11:F6:A1:27:EA:74:47:F0
Alternative Names
1 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=63072000; includeSubDomains; preload
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
  • • 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
Configured (Restricts certificate issuance)
Current Issuer
Authorized (Matches CAA policy)
Authorized CAs
letsencrypt.org ; validationmethods=http-01;accounturi=https://acme-v02.api.letsencrypt.org/acme/acct/23216805 awstrust.com digicert.com
Incident Reporting
Recommendations
  • • Consider using critical flag (flags=128) for stricter CAA enforcement
  • • Consider adding 'issuewild' records to control wildcard certificate issuance

Subject Alternative Names

1 domain
go.fossa.com