77/100 SECURITY SCORE

Certificate Information

Subject
CN=netzklug.de
Issuer
C=US, O=Google Trust Services, CN=WR3
Valid From
August 07, 2026
Valid Until
November 05, 2026 62 days
Public Key
RSA 2048 bit Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
6E:CC:0B:EF:00:C8:8B:08:98:30:2A:AE:CA:19:26:F4:B0:4C:98:A5:58:D3:30:EC:54:05:AC:74:2E:7C:7B:00
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
Present
max-age=31556926
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
  • Increase HSTS max-age to at least 1 year and add includeSubDomains
  • 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

100 domains
learn.acadabuddy.com

Other domains in certificate

www.achadi.com.br
al-rayan-engineering.com
www.antigonemedia.com
auth.applizy.com
bliggs.com
app.bonkipagamentos.io
www.brooksrecleague.com
buyzocart.shop
cerealnoble.com
www.circleheart.dev
www.cloudsecurely.com
coingraderpro.app
tambores.colmeiaresinas.com.br
cal.commontcm.sg
cosexam.com
cpenexam.com
digitalbasics.co
imarika.digitalreceipt.co.ke
coordinator.diversityinbusinessawards.ie
app.dosidekick.com
dpedestal.com www.dpedestal.com
downloads.eceos.com.br
rcf.ecnet.tw
bit.edu.bf
pre-backoffice.eldiarioar.com
www.ellakandacanopykitchen.com
quranlights.et3am.com samicafee.et3am.com
evmcast.xyz
jdpb.exodusadmin.work
fillin.app
app.flashiibo.com
ar.gda.sa
www.geminiextensions.com
learn.ginesys.in
applications.gonka.vip
happysacksrubbishremoval.co.uk
help-mom-feel-better.com
homecaremais.com.br
crm.ibcea.com.br
jamiewittenberg.com www.jamiewittenberg.com
oncax.jvsantos.com.br
admin.kashs.io
www.kombooster.com.br
kritikasoftware.com
fleet.landltransportinc.com
auth.lilalabs.app
lukasflint.com
funtasy.lyriuzan.com
www.mahosiprotection.co.za
maisonmaromara.com
www.mangatk.app
mars-terra.com
www.mcvayhr.lat
mecly.app
www.mednaath.com
miaobanya.com
modulareplanejados.com.br
partners.nationalbingoday.ph
nazarieventures.tech
neontd.co
netzklug.de
www.nirnaya.app
ntpqk.id.vn
www.olve.io
once-kit.com
onemvision.com
client.openhotel.app openhotel.app
optimium-courtage.com
www.ouropixel.com.br
backoffice.sandbox.sign.qitech.com.br
www.qpicada.com
realityrecon.com
admin.recruitosbaseball.com
www.reformascaraman.es
rentalmobiltulungagung.com
www.rnhanc.org
www.saistudio-app.com
chicken.sanderrr.nl
zalocrm.sfp.vn
sinergysolution.my
www.soso-tools.com
taxlink.bg
link.tenzor.rs
petgest.tinai.es
trade-view.app
transupport-app.com
auth.ttchof.de
www.utahhems.com
meu.vendergas.com.br
veryimportantcomputerclub.com
veryimportantcomputing.com
vjsnapp.com
www.wayupstudio.co.kr
ypsolucoes.com.br
pagariasporesto.zafirolab.com