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SECURITY SCORE
Certificate Information
Subject
CN=t-online.de
Issuer
C=US, O=Let's Encrypt, CN=E7
Valid From
November 24, 2025
Valid Until
February 22, 2026
89 days
Public Key
ECDSA
256 bit
(P-256)
Adequate
Signature Algorithm
ECDSA-SHA384
SHA-256 Fingerprint
F7:FA:28:79:6C:5F:0D:C6:A1:DF:D4:16:92:76:75:67:4E:58:52:0B:D5:DA:F5:DD:BB:28:50:15:64:F3:A1:C4
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
Weak
frame-ancestors
X-Frame-Options
Missing
Not configured
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Good
strict-origin-when-cross-origin
Permissions-Policy
Missing
Not configured
Recommendations
- • Significantly strengthen CSP directives
- • Add X-Frame-Options: DENY or SAMEORIGIN to prevent clickjacking
- • 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
94 domains
t-online.de
augenblicke.t-online.de
auto.t-online.de
autobewertung.t-online.de
bilder.t-online.de
blog.t-online.de
boersenradar.t-online.de
bundesliga.t-online.de
business-online.t-online.de
computer-electronics.t-online.de
computer-insider.t-online.de
computer.t-online.de
derivate.t-online.de
digital.t-online.de
dsl-und-dienste.t-online.de
eltern.t-online.de
em.t-online.de
email-logout-abgeschlossen.t-online.de
emaildienste.t-online.de
finanzen.t-online.de
frag.t-online.de
fussball.t-online.de
gaspreise.t-online.de
gold.t-online.de
handy.t-online.de
home.t-online.de
internetpraesenz.t-online.de
jobsuche.t-online.de
karrierewissen.t-online.de
kids.t-online.de
lifestyle.t-online.de
login.t-online.de
lottoservice.t-online.de
nachrichten.t-online.de
olympia.t-online.de
oncomputer.t-online.de
onnachrichten.t-online.de
onsport.t-online.de
onunterhaltung.t-online.de
partnerfragmente2013.t-online.de
reise.t-online.de
reisen.t-online.de
service.t-online.de
shopping-portal.t-online.de
spiele.t-online.de
spielothek.t-online.de
sport.t-online.de
surfen-und-telefonieren.t-online.de
t-games.t-online.de
themen.t-online.de
tippspiel.t-online.de
top-themen.t-online.de
tourenplaner.t-online.de
unterhaltung.t-online.de
wetter.t-online.de
wirtschaft.t-online.de
wlan.t-online.de
ww.t-online.de
xn--kln-sna.t-online.de
xn--mnchen-3ya.t-online.de
www.dsl-und-dienste.t-online.de
www.gold.t-online.de
www.handy.t-online.de
www.heute.t-online.de
www.home.t-online.de
www.surfen-und-telefonieren.t-online.de
www.themen.t-online.de
beta-buzz.de
beta-buzz.eu
beta-buzz.net
betabuz.com
betabuz.de
betabuz.net
betabuzz.de
betabuzz.eu
betabuzz.net
feel-green.de
feelgreen.de
good-appetite.de
good-appetite.net
goodappetite.de
gutenappetit.de
mydoc.de
perlfrech.de
t-online-business.de
www.t-online-business.de
t-online-travel.de
www.t-online-travel.de
tagesanbruch.de
tankenapp.de
wahlzeit.de
www.wahlzeit.de
wetter.info
zuhause.de
Other domains in certificate