How many SSL certificates have been issued for a4b.zendesk.com?

Our index has recorded 14 certificates for a4b.zendesk.com across public Certificate Transparency logs. This includes the apex domain and all subdomains.

How can I monitor new certificates for a4b.zendesk.com?

Sign up for a free account to add a4b.zendesk.com to your watchlist. CT Radar will alert you whenever a new certificate is issued for the domain or any subdomain. Useful for detecting unauthorized issuance, phishing, or shadow IT.

What subdomains exist for a4b.zendesk.com?

Certificate Transparency logs reveal historical subdomains because every TLS certificate's Subject Alternative Names (SANs) are publicly logged. The result table on this page lists subdomains discovered for a4b.zendesk.com. For programmatic access, use the ct-radar CLI: `pip install ct-radar && ct-radar a4b.zendesk.com`.

Is this data official?

Yes. Certificate Transparency is a Google-led initiative (RFC 6962) requiring all Certificate Authorities to publicly log every certificate they issue. CT Radar continuously ingests Cloudflare Nimbus and Google Argon CT logs. Data is canonical, not crowdsourced.

a4b.zendesk.com

Every SSL/TLS certificate ever issued for this name, indexed from public CT logs.

csv export pro

total records

active · on this page

expired · on this page

unique issuers · on this page

issuers on this pageLet's Encrypt7Google Trust6GoDaddy1

domain	issuer	valid	status
a4b.zendesk.com crt.sh Let's Encrypt	Let's Encrypt	Apr 1, 2025→Jun 30, 2025	expired 10mo ago
a4b.zendesk.com crt.sh Google Trust	Google Trust	Apr 1, 2025→Jun 30, 2025	expired 10mo ago
a4b.zendesk.com crt.sh Google Trust	Google Trust	Mar 31, 2025→Jun 29, 2025	expired 10mo ago
a4b.zendesk.com crt.sh Google Trust	Google Trust	Jan 31, 2025→May 1, 2025	expired 1y ago
a4b.zendesk.com crt.sh Let's Encrypt	Let's Encrypt	Jan 31, 2025→May 1, 2025	expired 1y ago
a4b.zendesk.com crt.sh Let's Encrypt	Let's Encrypt	Jan 31, 2025→May 1, 2025	expired 1y ago
a4b.zendesk.com crt.sh Let's Encrypt	Let's Encrypt	Jan 30, 2025→Apr 30, 2025	expired 1y ago
a4b.zendesk.com crt.sh Google Trust	Google Trust	Jan 30, 2025→Apr 30, 2025	expired 1y ago
a4b.zendesk.com crt.sh GoDaddy	GoDaddy	Dec 2, 2024→Mar 2, 2025	expired 1y ago
a4b.zendesk.com crt.sh Let's Encrypt	Let's Encrypt	Nov 23, 2024→Feb 21, 2025	expired 1y ago
a4b.zendesk.com crt.sh Google Trust	Google Trust	Jan 21, 2026→Apr 21, 2026	expired 14d ago
a4b.zendesk.com crt.sh Let's Encrypt	Let's Encrypt	Nov 23, 2025→Feb 21, 2026	expired 2mo ago
a4b.zendesk.com crt.sh Let's Encrypt	Let's Encrypt	Nov 23, 2025→Feb 21, 2026	expired 2mo ago
a4b.zendesk.com crt.sh Google Trust	Google Trust	Nov 23, 2025→Feb 21, 2026	expired 2mo ago

Pipe results into your recon pipeline

# Python
$ pip install ct-radar
$ ct-radar a4b.zendesk.com | httpx -silent

# Go
$ go install github.com/imfht/ct-radar-cli/cli@latest
$ ct-radar a4b.zendesk.com | nuclei

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About certificate history for a4b.zendesk.com

This page lists every X.509 (SSL/TLS) certificate ever issued for a4b.zendesk.com and its subdomains, as recorded in public Certificate Transparency (CT) logs. CT logs are an immutable, append-only record of every certificate issued by participating Certificate Authorities (CAs), as required by the major browsers since 2018.

Subdomain enumeration via CT logs is one of the highest-signal techniques in reconnaissance — every time a TLS certificate is issued, all Subject Alternative Names (SANs) on that certificate become public. Internal and forgotten subdomains regularly show up here days after they're set up.

To monitor a4b.zendesk.com for newly-issued certificates in real-time (useful for detecting unauthorized issuance, phishing variants, or shadow IT) add it to your watchlist (Pro plan).