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How to Check an SSL Certificate?

1

Enter the Domain

Type the domain name you want to check (e.g., yourhotel.com) into the search box.

2

Click Check

The tool initiates a TLS handshake via port 443 and downloads the certificate chain.

3

Read the Report

Issuer, expiration date, TLS version, security grade (A+ to F), and days remaining—all on one screen.

What is an SSL Certificate Lookup?

SSL certificate lookup is an auditing process that reads and verifies the digital certificate a website presents over HTTPS using public sources. It reports the certificate's duration, issuer, TLS protocol used, and chain integrity in seconds. It operates without sending a single byte of data to your site, making it a secure and non-intrusive check.

Why Should Your Hotel Perform Regular SSL Checks?

The padlock icon a guest sees in their browser while booking is the foundation of their decision to share credit card information. If your SSL certificate is expired or uses a weak protocol, browsers display a 'Not Secure' warning, leading to immediate loss of conversions. Furthermore, knowing that malicious domain names mimicking yours can easily obtain valid SSL via Let's Encrypt is the first step in protecting your guests.

What Do You See in an SSL Report?

The report lists details such as the certificate issuer (issuer), the domain it is valid for (subject), its expiration date (validTo), days remaining, the protocol used (TLS 1.2 / TLS 1.3), SHA-256 fingerprint, and a security grade from A+ to F on a single page.

How It Works (Technical Background)

The tool initiates a TLS handshake with the entered domain via port 443 and downloads the certificate chain provided by the server. It verifies the root and intermediate certificates in the chain, calculates the expiration date, and reads the cipher suite used. Since all this data is publicly available, it never accesses your site content, database, or users.

How Is SSL Misused on Fake Hotel Sites?

Modern scammers register typosquatting domains and obtain valid SSL certificates through Let's Encrypt in 10 minutes. The appearance of a padlock icon in the browser builds trust for the guest on the fake site. Therefore, an SSL check alone is not enough; it must be performed alongside domain ownership verification, WHOIS lookup, and CT log monitoring.

What Should You Do If the SSL Grade Isn't A+?

A low grade is often caused by outdated TLS versions (1.0/1.1), weak cipher suites, missing intermediate chains, or an upcoming expiration. The warning line in the report identifies the issue. Request a TLS 1.3 + modern cipher + full chain configuration from your hosting provider. If there are fewer than 30 days until expiration, start the renewal process today.

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How does the SSL lookup tool work?
The tool connects to your domain via HTTPS, reads the certificate chain presented by the server, and reports the date, issuer, protocol, and cipher suite. It never accesses your site content.
What does a 'Not Secure' warning mean?
It could mean the certificate has expired, the domain name doesn't match, the certificate chain is incomplete, or it has been revoked. The error line in the report identifies the source of the problem.
How is the SSL grade from A+ to F determined?
Factors such as TLS protocol version, cipher suite strength, certificate chain integrity, HSTS headers, and forward secrecy support are scored. TLS 1.3 + strong cipher + full chain = A+.
Is a site with a Let's Encrypt certificate safe?
The certificate itself is technically valid, but Let's Encrypt validation only tests domain ownership. Fake hotel sites can also use valid Let's Encrypt SSL; therefore, SSL, WHOIS, and domain age should be evaluated together.
How can I find out how many days are left until my certificate expires?
The 'Days Remaining' field in the report gives you the exact count. If there are fewer than 30 days left, it is recommended to set up auto-renewal or notify your administrator.
Can I use the tool on my clients' sites too?
Yes, since you are checking public SSL certificates for every domain used, no permission is required. Agencies or digital operations teams can easily use it for scanning client portfolios.
Does it check my subdomains as well?
This tool queries a single domain. To scan all your subdomains and see the SSL status for each, you can use it in conjunction with the Subdomain Finder.
My certificate looks valid but the browser gives an error, why?
Most often, the intermediate certificate has not been installed on the server. If you see a 'chain incomplete' line in the report, ask your hosting provider for a full chain installation.

Related Tools

CT Log Search
Phishing Check
WHOIS Lookup
Subdomain Finder

Related Guides

how to detect fake SSL certificatesmonitoring Certificate Transparency logsprotecting against typosquatting attacks

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