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Which of your addresses does your site certificate cover?

By Mark KashefPublished October 8, 2026

The certificate coverage check compares the addresses public certificate logs list for your domain with the addresses your site certificate covers. The difference is usually normal, and each extra address still needs an owner.

What does this check look at?

It looks at how the names public certificate logs list for your domain compare with the names your site certificate covers. Every new certificate is published in public logs, so a new site shows up within minutes of going live. Attackers read the same logs to list your addresses.

Pulse and Deep scans both run it. It reads public records about your domain and never touches your site. It applies only when public certificate history for the domain could be read.

Curious what your site shows from outside? The quick check is free and needs no account.

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What does a result mean?

What the report showsWhat it meansWhat to do
PassEvery logged address is covered by the certificate your site shows.Nothing.
AttentionSome logged addresses fall outside it.Confirm each one is still yours and still in use.
Not testedCertificate history or the certificate names were not available.Nothing to act on.

Names outside the certificate usually belong to other services, so a difference does not show a problem on its own. Nothing outside the certificate is contacted. A clean result means nothing was found in what the scan read. It does not prove the problem is absent from parts the scan never sees.

How serious is a finding?

Treat this as a hardening gap. It makes an attacker’s job easier but gives them no path of its own, so fix it after anything more direct. Confidence starts at medium, because it rests on public records rather than a response from your site. The report lists what to fix by how directly someone could use it, not by the severity label.

What does a confirmed finding have to show?

PartFor this check
Where it startsAnyone sending mail or resolving your domain
The protection that should stop itA DNS setting read from public records
What is reachedEmail and DNS trust decisions
What followsA hardening gap for your domain

Which standards does it relate to?

StandardReference
OWASP Top TenA02:2025 Security Misconfiguration

Each one is a related control, not a verification. A scan sees what anyone online can see, so it never proves a whole requirement is met.

Fix it with your AI

This is an inventory task, and an AI with access to your DNS settings can do most of it.

Fix prompt for any coding agent
Here is a list of addresses on my domain that appear in public certificate logs but are not covered by my main site certificate: [paste the addresses from the report]. For each one, tell me what service it points to in my DNS records, whether I still use it, and suggest which records I can delete. Do not delete anything yourself.

How to check

Say Atlas, our example app at atlas.example, has a certificate for the main site, while the logs also list a status page and an old shop. The check lists both so someone can confirm they are still wanted.

Run a Pulse scan from your Lockpick account to see it for your site. Pulse or Deep explains what each scan reads, and the full list of checks shows the rest.

Questions people ask

Is an address outside my certificate a problem?

Usually not. Other services often have their own certificates. It matters when nobody remembers the address, because forgotten addresses are where takeovers happen.

Where do these names come from?

From public certificate logs, which record every certificate a public authority issues. Anyone can search them.

See what your site shows from outside

A quick check reads your homepage the way a visitor would and gives you a score. No account needed.

Check your site

Related pages

  • Could someone take over a forgotten subdomain of yours?
  • Which addresses on your domain are controlled by other companies?
  • Does your HSTS rule cover your other subdomains too?

Sources

  1. How attackers find your site Lockpick docs, read on October 7, 2026
  2. How we rate findings Lockpick docs, read on October 7, 2026

About the author

Mark Kashef, Founder of Lockpick

I'm Mark, and I build Lockpick. I write these pages, and each one is checked against its sources before it goes live. The Updated date changes only when the page itself does.

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Lockpick is a security scanner for vibe-coded apps. It checks what your live site exposes and what a GitHub repo or AI skill would do before you install it, then gives you a fix prompt for Lovable, Bolt, Replit, Cursor or Claude Code.

Lockpick assesses public pages you are authorized to test, and public GitHub code it never runs.

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