SSL Lookup
Check a public website's SSL certificate issuer, domain names and expiry date. Understand certificate findings and the next steps for HTTPS issues.
CHECK THE CONNECTION
Know what your HTTPS certificate covers.
Read the hostname, issuer and renewal window together.
Check certificate details before guessing at the problem
An HTTPS warning can interrupt a customer before they reach your product, booking form or enquiry page. When I review a website change, I want to know which hostname is affected and what certificate it actually serves. A working certificate on one subdomain does not establish that every part of the site is configured correctly.
Enter a domain or website URL. The lookup connects to that hostname over HTTPS on port 443 and shows the certificate returned when this server can verify the connection. A supplied page path is not used: certificates apply to hostnames, not individual product or service pages.
Read these details together
Hostname and alternative names
Check the exact address customers use, including www where relevant. Alternative names show the names listed in the certificate. Separate subdomains can have different certificates or hosting arrangements.
Issuer and validity dates
The issuer identifies the certificate authority information. The start and expiry dates show the certificate's validity window. Dates here use UTC. Days until expiry is a snapshot, not a renewal reminder or monitoring service.
The connection that was checked
A successful result means the connection passed this server's certificate verification. It is not a complete certificate-chain report, revocation check or audit of every protocol and cipher. A CDN may serve a different certificate from the origin server.
How this fits a website or ecommerce review
After a domain change, hosting migration or renewal, check the main hostname and any important subdomains separately. Then test the HTTP-to-HTTPS redirect, internal links, canonical URLs and customer forms. For a store, include the product-to-checkout journey rather than stopping at the homepage.
Use the URL Redirect Checker to follow the HTTP address and the HTTP Headers Lookup to inspect the first response. My ecommerce SEO work connects technical checks with how customers find products and complete their next step.
When a certificate lookup fails
A failed result can come from an expired or mismatched certificate, an incomplete trust chain, a network restriction, a timeout or a site that blocks automated requests. This tool does not disable verification to retrieve untrusted certificate details. It also does not currently support IPv6-only hosts.
Keep the hostname and error message, then ask your hosting or CDN provider to investigate. Do not bypass a browser warning to submit customer details. For a broader diagnosis, work with me on the website priorities while the infrastructure owner handles certificate changes.
SSL lookup questions
Are SSL and TLS the same thing?
SSL certificate is still commonly used as a search term for HTTPS certificates. Modern HTTPS uses TLS. This lookup reads the website certificate; it is not a protocol-version scanner.
Does a valid certificate mean a website is safe?
No. HTTPS protects the connection and certificate checks relate to the hostname and trust chain. They do not establish that a business is legitimate, its content is accurate or its software is free from vulnerabilities.
Can I inspect an expired or self-signed certificate here?
The connection must pass verification for details to be shown. An expired, self-signed or otherwise untrusted certificate may produce a verification error instead. Your hosting provider can inspect the installation directly.
Can I check www, a shop subdomain or a different port?
Check each public hostname separately. This tool uses port 443 only and rejects custom ports and private-network addresses. It does not check mail-server certificates.
Will you remind me when the certificate expires?
No. This is a one-time lookup. Check renewal automation and alerts with the hosting, CDN or certificate provider responsible for your website.
Will renewing my certificate improve rankings?
Renewal keeps HTTPS working; it is not a standalone growth strategy. If visits fell during an outage, review availability, redirects, crawl signals and measurement before assigning a cause. AI crawlers also need access to the content, but a certificate alone does not secure an AI citation.
Further reading
Read why websites should use HTTPS from Let's Encrypt. For domain records, use the DNS Lookup; for page-level metadata, use the Meta Tags Checker.