Certificate Transparency Log Monitor
Certificate Transparency Log Monitor launched on July 28, 2016 with 53 votes, #1,463 of 3,671 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 10 years on.
In plain words
Certificate Transparency Log Monitor monitors domains for SSL certificate issues including expiration, revocation, and unauthorized issuance. It watches Certificate Transparency logs and sends alerts when suspicious certificates appear for a user's domains, helping protect against impersonation attacks, DNS tampering, BGP hijacking, and subdomain takeover. The tool is designed for organizations that need to detect certificate-related security threats before they result in incidents.
written from the facts on this page · September 2026
From the sources
Cert Spotter monitors your domains for expiring, unauthorized, and invalid SSL certificates, so you can act before an incident, not after. Attackers can use ill-gotten certificates to impersonate your website and intercept data from your customers. You shouldn't be in the dark when this happens. Cert Spotter monitors Certificate Transparency logs and alerts you when an unauthorized certificate is issued for one of your domains, protecting you from certificate authority vulnerabilities, DNS tampering, BGP hijacking, and subdomain takeover. Expired, revoked, or incorrectly-installed certificates cause browser errors that drive customers away from your website and cost you business. Wouldn't…from sslmate.com
Does a similar job
all alternatives →- CSCertStream – See SSL certs as they're issued in real time2017 · certstream.calidog.io · ▲142
Observe Domains2022 · observe.domains · ▲78Monitor domain settings, SSL certificates, expiration dates
Certificate Transparency Advisor – proactive alerting2015 · github.com · ▲10A monitoring service for Certificate Transparency. Contribute to technion/ct_advisor development by creating an account on GitHub.
Free Certificate Monitoring via RSS2024 · raphting.dev · ▲120
Never have an SSL certificate expire again2022 · haveibeenexpired.com · ▲40Automated SSL certificate monitoring with expiration alerts, Certificate Transparency discovery, and Slack/Discord/Teams notifications. Prevent downtime with continuous monitoring.
Osint tool that finds exposed files on domainsJul 2026 · search.cerast-intelligence.com · ▲58hey guys, wanted to show one of my side projects i just made public. the idea is basically another osint tool for pentesters and bug bounty hunters. it watches certificate transparency logs and checks newly-seen domains for exposed stuff like .env files, open .git dirs, config files, db dumps and so on, and puts whatever it finds into a searchable db. you just search a domain (or part of one) and see what's exposed. it's read-only and free. one thing i've been thinking about adding is a way to register for certain keywords and get notified when something new shows up for that search. would…
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