91/100 SECURITY SCORE

Certificate Information

Subject
CN=telfairelementary.com
Issuer
C=US, O=Let's Encrypt, CN=R13
Valid From
December 11, 2025
Valid Until
March 11, 2026 30 days
Public Key
RSA 4096 bit Strong
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
F7:BE:B0:B8:34:20:9B:BA:FB:A9:14:F3:EA:42:06:FB:01:01:A2:7D:29:C3:01:8E:BE:31:81:E1:37:71:50:F9
Alternative Names

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
Missing
Not configured
X-Frame-Options
Excellent
DENY
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Good
strict-origin
Permissions-Policy
Present
geolocation=(),midi=(),sync-xhr=(),microphone=(),camera=(),magnetometer=(),gyroscope=(),fullscreen=(self),payment=()
Recommendations
  • Add Content-Security-Policy header to prevent XSS attacks

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

90 domains
viessmann.academy *.viessmann.academy

Other domains in certificate

tecswitches.com *.tecswitches.com
telefono.center *.telefono.center
telfairelementary.com *.telfairelementary.com
telo.guru *.telo.guru
tenantsverify.com *.tenantsverify.com
tenbudou.com *.tenbudou.com
the-furniture-outlet.uk *.the-furniture-outlet.uk
theanswers.info *.theanswers.info
thelittlejute.co.uk *.thelittlejute.co.uk
therigtnt.com *.therigtnt.com
thetimeofourlies.com *.thetimeofourlies.com
thewhitbyphotographer.co.uk *.thewhitbyphotographer.co.uk
thewhitehousesupply.com *.thewhitehousesupply.com
thirstytopher.fun *.thirstytopher.fun
thiscatholichome.com *.thiscatholichome.com
thomaslanedesign.co.uk *.thomaslanedesign.co.uk
thorplaymarketing.com *.thorplaymarketing.com
those-who-wander.com *.those-who-wander.com
ti-pai.com *.ti-pai.com
tiktokfreefans.com *.tiktokfreefans.com
timesindia18.com *.timesindia18.com
tinderxxx.com *.tinderxxx.com
todonombres.org *.todonombres.org
toptoon.life *.toptoon.life
toptopi.com *.toptopi.com
tormenterasdelcaribepr.com *.tormenterasdelcaribepr.com
trangcacuocbongdavn.com *.trangcacuocbongdavn.com
tristarfordkittanning.com *.tristarfordkittanning.com
trolleypubct.com *.trolleypubct.com
tucao.cool *.tucao.cool
unisupdi.education *.unisupdi.education
ushomemaintenance.com *.ushomemaintenance.com
valorant.house *.valorant.house
vinylbus.com *.vinylbus.com
viperpartsofamerica.com *.viperpartsofamerica.com
viralusastories.info *.viralusastories.info
virtu.games *.virtu.games
visionzambia.co.uk *.visionzambia.co.uk
vitalitymassageonline.com *.vitalitymassageonline.com
vivi-water.com *.vivi-water.com
vlone.life *.vlone.life
voacorp.com *.voacorp.com
vodo.finance *.vodo.finance
vodonagrivach.com *.vodonagrivach.com