DNS Gurus
Cached · just now
73/100 SECURITY SCORE

Detected Technologies

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

Certificate Information

Subject
CN=linkbook.bio
Issuer
C=US, O=Let's Encrypt, CN=R12
Valid From
December 26, 2025
Valid Until
March 26, 2026 29 days
Public Key
RSA 4096 bit Strong
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
0B:0A:A9:40:9F:EE:0A:CB:F9:D4:BA:F5:D1:33:D8:AF:02:30:DD:4A:EE:5F:03:4D:DF:A4:7B:30:1A:02:24:98
Alternative Names
89 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
Missing
Not configured
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 Strict-Transport-Security header with max-age of at least 1 year
  • • 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

89 domains
linkbook.bio *.linkbook.bio *.112134.linkbook.bio *.beta.linkbook.bio *.blog.linkbook.bio *.demo.linkbook.bio *.my.linkbook.bio *.page.linkbook.bio *.popup.linkbook.bio *.report.linkbook.bio *.test.linkbook.bio *.ww25.linkbook.bio

Other domains in certificate

bergzeig.de *.bergzeig.de *.login.bergzeig.de
christiankitchen.co.uk *.christiankitchen.co.uk *.ww25.christiankitchen.co.uk
cotatday.com *.cotatday.com *.ww25.cotatday.com
dissengends.com *.dissengends.com
*.adapttimber.fairbnb.net *.adapttimbercom.fairbnb.net *.beastfords.fairbnb.net *.bnbook.fairbnb.net *.booksonboard.fairbnb.net *.com.fairbnb.net fairbnb.net *.fairbnb.net *.fordxr5turbo.fairbnb.net *.helpmeairbnb.fairbnb.net *.hosposocial-com-au.fairbnb.net *.hosposocial.fairbnb.net *.literaryelixirs.fairbnb.net *.markited.fairbnb.net *.mjryan.fairbnb.net *.random.fairbnb.net *.roamlocal.fairbnb.net *.sharingaustralia.fairbnb.net *.vicaiacom.fairbnb.net
*.app.lear.studio lear.studio *.lear.studio
medentry.com.au *.medentry.com.au *.onlinelearning.medentry.com.au *.ww25.medentry.com.au
*.dev.music-love.me music-love.me *.music-love.me
myshenye.com *.myshenye.com *.www.myshenye.com
*.42tlmchft2sepwn7.pairbet.online *.dash.pairbet.online *.eloizwebmail.pairbet.online pairbet.online *.pairbet.online *.ww25.pairbet.online
rajrestaurant.co.uk *.rajrestaurant.co.uk
*.1.seterra.co *.dev.seterra.co *.online.seterra.co *.pfstiww1.seterra.co seterra.co *.seterra.co *.ww1.seterra.co
sewtogetherromsey.co.uk *.sewtogetherromsey.co.uk
ss4gas.co.uk *.ss4gas.co.uk *.ww38.ss4gas.co.uk *.www.ss4gas.co.uk
stjo.pro *.stjo.pro
telegrow.io *.telegrow.io
thebesttraffever.ru *.thebesttraffever.ru
theguitarshoponline.com *.theguitarshoponline.com
*.backend.wuwuxia3.cc *.demo.wuwuxia3.cc wuwuxia3.cc *.wuwuxia3.cc *.ww25.wuwuxia3.cc