TLS/SSL certificate check


Port to connect on:
Secure HTTP / HTTPS - port 443 Secured SMTP - port 465 Secured IMAP - port 993 Secured POP3 - port 995

TLS/SSL check of 'ftp.gnu.org (209.51.188.20)'

Multiple A-records!

The domain 'ftp.gnu.org' has severals A/AAAA-records - and thereby multiple IP's to check.

click to use
2001:470:142:3::b

Summary


Host:
ftp.gnu.org, 209.51.188.20, port 443


Protocols:
All good
 2 supported protocols: TLS 1.3, TLS 1.2


Certificate:
All good
 Certificate 'ftp.gnu.org' is verified okay. Issued by 'R3'. Expires 08-07-2024.

Protocol support



Protocol support:
TLS 1.3
Supported
TLS 1.2
Supported
TLS 1.1
No support
TLS 1.0
No support
SSL 3.0
No support
SSL 2.0
No support

Verification:
TLS 1.3 is supported
 

Chain of certificates

3 of 3 - End-Entity
ftp.gnu.org

Certificat:
ftp.gnu.org

Issued by:
R3, Let's Encrypt, US

Valid:
From 09-04-2024 to 08-07-2024

Verification:
Certificate is verified okay

SAN's:
alpha.gnu.org
ftp.gnu.org

Key:
RSA, 2048 bit
Signature algorithm:
sha256RSA

Serial:
04F8217072A40B42B419874DCD529CD955DC

PEM format:
Click to see certificate as PEM (modal)

2 of 3 - Intermediate
R3

Certificat:
R3, Let's Encrypt, US

Issued by:
ISRG Root X1, Internet Security Research Group, US

Valid:
From 03-09-2020 to 15-09-2025

Verification:
Certificate is verified okay

Key:
RSA, 2048 bit
Signature algorithm:
sha256RSA

Serial:
00912B084ACF0C18A753F6D62E25A75F5A

PEM format:
Click to see certificate as PEM (modal)

1 of 3 - Root certificate
ISRG Root X1

Certificat:
ISRG Root X1, Internet Security Research Group, US

Issued by:
ISRG Root X1, Internet Security Research Group, US

Valid:
From 04-06-2015 to 04-06-2035

Verification:
Certificate is verified okay

Key:
RSA, 4096 bit
Signature algorithm:
sha256RSA

Serial:
008210CFB0D240E3594463E0BB63828B00

PEM format:
Click to see certificate as PEM (modal)

Root Store trust

Root Certificat:
ISRG Root X1
Issued by:
Internet Security Research Group

Root Store trust:
The root certificte is trustet by ALL major trusted root certificate stores

Microsoft:
Root Certificate is fully trusted by Microsoft (Windows)

Apple:
Root Certificate is fully is trusted by Apple (iOS, iPadOS, macOS)

Android:
Root Certificate is fully is trusted by Android

API

You may perform this lookup using the API and get the results as easy-to-parse JSON data.

Read more on the API at https://iamroot.tech/about/api (regarding authentication and rate limits, among other things), or give it a go right away using the 'try it' button.

 
GET
 https://iamroot.tech/ssl-certificate-check/api/?host=ftp.gnu.org copy try it
 

Log

080+080
  • Host 'ftp.gnu.org' resolved in 79ms
080+000
  • INFMultiple A-records!
    Domain 'ftp.gnu.org' has several A-records, and thereby multiple IPs to check. IP 209.51.188.20 will be used.
081+000
  • Check protocols
081+000
  • Start TLS 1.1 protocol check, ftp.gnu.org (209.51.188.20), port 443
081+000
  • Start SSL 2.0 protocol check, ftp.gnu.org (209.51.188.20), port 443
081+000
  • Start TLS 1.3 protocol check, ftp.gnu.org (209.51.188.20), port 443
081+000
  • Start TLS 1.2 protocol check, ftp.gnu.org (209.51.188.20), port 443
081+000
  • Start TLS 1.0 protocol check, ftp.gnu.org (209.51.188.20), port 443
081+000
  • Start SSL 3.0 protocol check, ftp.gnu.org (209.51.188.20), port 443
112+031
  • Protocol check of SSL 3.0 done in 30ms - failed
    Unable to authenticate connection using SSL 3.0
112+031
  • Protocol check of SSL 2.0 done in 31ms - failed
    Unable to authenticate connection using SSL 2.0
140+059
  • Protocol check of TLS 1.0 done in 59ms - failed
    Unable to authenticate connection using TLS 1.0
144+063
  • Protocol check of TLS 1.1 done in 63ms - failed
    Unable to authenticate connection using TLS 1.1
151+070
  • Protocol check of TLS 1.3 done in 69ms - all good
179+098
  • Protocol check of TLS 1.2 done in 98ms - all good
179+067
  • TLS 1.3 is supported
179+000
  • Done
179+000
  • Check certificate
180+000
  • Load and verify chain of certificates
273+094
  • Full chain of certificates has been loaded and verified in 93ms.
274+000
  • End-Entity certificate verification success
    Certificat 'ftp.gnu.org' SUCCEDED the verification.
274+000
  • Host 'ftp.gnu.org' is matching Subject/SAN 'ftp.gnu.org' of certificate. All good!
274+000
  • Intermediate certificate verification success
    Certificat 'R3' SUCCEDED the verification.
274+000
  • Root certificate verification success
    Certificat 'ISRG Root X1' SUCCEDED the verification.
274+000
  • Check root store status of root certificate
275+002
  • Trustet by all major trusted root certificate stores
    The root certificte is trustet by ALL major trusted root certificate stores
275+000
  • Done
275+000
  • Done
275+000
  • Done