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SSL Certificate

Analyze SSL/TLS certificates for any website, checking issuer details, validity period, expiration warnings, and alternative names.

Quick Examples: google.com github.com cloudflare.com wikipedia.org

Turkey National Cyber Security Status (USOM)

SAFE: No active restrictions found in USOM registry
Clean / Allowed
B
Security Grade B • Overall Certificate Health Verdict

Incomplete Certificate Chain Detected

91sq.su → 157.90.33.74:443 Port 443 Open • 243.66 ms Connection Latency

Cryptographic Key Matching
Target Domain
Matches Requested Hostname
Chain Integrity
Chain Incomplete
Time Remaining
51 Days Remaining
Cipher Suite
TLSv1.2 • 128 bits

Server Configuration Remediation Guides

1 Diagnostics
critical

Incomplete Certificate Chain Detected

Download Intermediate Certificate (.crt)

The server is missing the intermediate certificate (ISRG Root X1). While some desktop browsers may cache it, mobile devices, Android, curl, and automated API clients will fail with an untrusted certificate error.

The certificate chain has a broken link. Intermediate certificate for "ISRG Root X1" is missing or out of order.
Bundle the intermediate CA certificate with your server certificate into a single file and reconfigure your web server.
Server Guides:
NGINX CONFIGURATION 
cat your_domain.crt intermediate.crt > fullchain.pem
# In nginx.conf:
ssl_certificate /path/to/fullchain.pem;
ssl_certificate_key /path/to/privkey.key;

Server Certificate Chain Hierarchy

5 Certificate(s)
1 Server Certificate (Leaf)
Matches Requested Hostname Valid
Common Name (CN) 91sq.su Issued By: YR2
Validity & Encryption
17.09.2026 23:03 → 16.12.2026 23:03
RSA 2048 bits • sha256WithRSAEncryption
⚠️ Intermediate Certificate Missing on Server
Download Intermediate Certificate

The server is only delivering the leaf certificate and is missing the intermediate CA certificate (ISRG Root X1).

2 Valid Intermediate Certificate
Valid Intermediate Certificate
Common Name YR2 Let's Encrypt
Validity & Issuer
2025-09-03 00:00:00 → 2028-09-02 23:59:59
Issuer: Root YR
3 Trusted Root Certificate Authority
Trusted Root CA
Common Name Root YR ISRG
Validity & Issuer
2026-05-13 00:00:00 → 2032-09-02 23:59:59
Issuer: ISRG Root X1
4 Valid Intermediate Certificate
Valid Intermediate Certificate
Common Name YR2 Let's Encrypt
Validity & Issuer
2025-09-03 00:00:00 → 2028-09-02 23:59:59
Issuer: Root YR
5 Trusted Root Certificate Authority
Trusted Root CA
Common Name Root YR ISRG
Validity & Issuer
2026-05-13 00:00:00 → 2032-09-02 23:59:59
Issuer: ISRG Root X1

Cryptographic Certificate Specifications

Common Name (CN) 91sq.su
Signature Algorithm sha256WithRSAEncryption
Serial Number (HEX) 0605C1FFC138C29F14BBA824967D9028F808
SHA-256 Fingerprint 1523b2e53e42fd4e20a1ccf1ce6cc6fc3f9476b338b6216129dcf490d1b8d0ae
Valid From 17.09.2026 23:03
Valid To / Expiry 16.12.2026 23:03
Issuer String YR2
Key Parameters RSA 2048 bits
Subject Alternative Names (SANs) (2)
*.91sq.su 91sq.su