SSL Lookup: Check Certificate, SANs, Expiry & TLS Version

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As an authorized reseller, we sell the same products at lower prices than buying directly from the Certificate Authority. Browsers begin showing warnings 30 days before expiry; expired certificates cause HTTPS failures, broken page loads, and SEO penalties. It also surfaces Certificate Transparency log entries showing every certificate ever issued for the domain pattern.
For portfolio-scale certificate expiry monitoring, CT log change alerts, and integration into security platforms, the SSL Certificate API for portfolio-scale monitoring returns parsed certificate data in JSON for thousands of domains with scheduled re-checks. Let’s Encrypt is a Certificate Authority that provides free TLS certificates, making it easy for websites to enable HTTPS encryption and create a more secure Internet for everyone. This vulnerability affects organizations with publicly accessible email addresses, particularly large companies, domains without strict email control, and domains using CAA (Certification Authority Authorization) DNS records. Multi-domain wildcard certificates go a step further, covering multiple domains and all their subdomains in a single product.
It is a cryptographic protocol that provides secure communication between a web server and a web browser. SSL.com enables users to verify domain control and obtain a TLS certificate for encrypted HTTPS connections by creating a _validation-contactemail DNS TXT record with the contact email address as the value. Internet security relies on trust, and the Certificate Authority (CA) is a key player in this system as it verifies website identities, and issues SSL/TLS certificates, which encrypt communication between a computer and the website. Free certificates from providers like Let’s Encrypt cover basic DV encryption but come without warranty coverage, dedicated support, or a site seal. The cost difference reflects the validation level (DV, OV, or EV), warranty amount, and Certificate Authority brand. Add optional wildcard coverage for subdomains.
Every certificate enables HTTPS and australian online casinos pokies uses the same 256-bit encryption regardless of price. For bulk SSL certificate inspection across a portfolio, use the SSL Certificate API, which supports concurrent requests and scheduled re-checks for expiry monitoring at scale. Certificate Transparency logs are public, append-only records of every SSL certificate issued by trusted Certificate Authorities. For OSINT and security research, SAN fields are one of the most reliable ways to discover undocumented subdomains and related infrastructure. A single certificate often covers a primary domain plus dozens of subdomains, related domains, and CDN endpoints. Use SSL Lookup to verify certificate installation, check expiry dates before they cause outages, confirm all expected domains are covered in the SAN list, and validate the full certificate chain (intermediate and root CA).
The Subject Alternative Names determine which hostnames the certificate is actually valid for; a certificate issued for example.com that is served on will fail name validation even though it is otherwise perfect. The certificate carries a fixed expiry, and an expired certificate produces a hard browser error for every visitor at once. The tool validates the chain the way a first-time visitor would, which is why it sometimes reports “not trusted” for a site that looks fine to you. The checker reports both, because a site can pass the first and fail the second. If the certificate is valid, the browser will establish a secure connection with the server.
Most browsers start showing warnings when a certificate has fewer than 30 days remaining. WhoisFreaks retrieves live certificate data directly from the target server alongside Certificate Transparency log entries – so you see both the currently-served certificate and the full historical issuance record in one query. Newly issued certificates for typosquatting domains (e.g., ‘paypa1.com’, ‘your-brand-login.com’) are often the earliest indicator of an upcoming phishing campaign. WhoisFreaks monitors CT logs continuously – when a new certificate is issued for a domain pattern matching your brand or keywords, it surfaces immediately. Check after every certificate renewal or server change, and set an expiry reminder. The checker flags this because it validates the chain as a clean client would. The configuration half is about protocols and cipher suites.
Start securing your websites with free SSL/TLS certificates from Let’s Encrypt. The company also disabled the ‘Email to DNS TXT Contact’ validation method and clarified that “this did not affect the systems and APIs used by Entrust.” However, due to this bug, SSL.com now considers the user as the owner of the domain used for the contact email. Researchers discovered a flaw in how SSL.com was checking if someone requesting a certificate actually controlled the domain name, a process called Domain Control Validation (DCV). However, recently, a serious problem was found with one of these trusted CAs, SSL.com. An SSL.com vulnerability allowed attackers to issue valid SSL certificates for major domains by exploiting a bug in its email-based domain verification method.
A $7.66 DV certificate encrypts data in transit identically to one costing several hundred dollars. All SSL certificates use the same 256-bit encryption standard. Real help with certificate selection, validation, and installation from a team that works with SSL every day. GoGetSSL competes on price across DV, OV, wildcard, and multi-domain categories. GeoTrust offers a mid-range balance of price and warranty across DV, OV, and EV products. Comodo-branded certificates are the same products under the legacy name.