Public certificate transparency search for issued certificates and names they cover.
Your information
Domain to search, for example example.com.
Maximum number of certificates to return, for example 100.
Include expired certificates, for example true.
Example results
- Subdomains
- Certificates
Certificates Link Crt Sh ID Valid From Valid Until Names Covered Serial Number Issuer Organization 295579452332026-09-242026-12-21*.example.com, example.com2caeeaf0743459d7e5f82a75123c58f3Sectigo Limited283619965642026-07-292026-10-27*.example.com, example.com0624d0ab311558780b7d5213b9631831SSL Corporation283619965052026-07-292026-10-27*.example.com, example.com62546d11b12882adbce18f65f9372286SSL Corporation283616178692026-07-292026-10-27*.example.com, example.com33f0f429d5622a91a1c3d5b6729e11e5SSL Corporation283616182582026-07-292026-10-27*.example.com, example.com49c9a73c64f9bda07dd9d469432b505fSSL Corporation228534182132025-12-022026-12-02example.com, www.example.com531e16f0f28235b65cc7cd35a5f0710bSectigo Limited226482648892025-11-212026-11-21example.com, www.example.com0f8f7abde735d78baa0bd4053f39021cSectigo Limited226255825222025-11-202026-11-20example.com009de10580fa26441939f38af4afb1cb40Sectigo Limited85069621252023-01-272033-01-24example.com1ac1e693c87d36563a92ca145c87bbc26fd49f4c—
About crt.sh
crt.sh’s Search certificates method returns matching certificates and DNS names for a required domain.
Search certificates returns newest certificates first; optionally include expired certificates or set a maximum result count.
Built by Fous from crt.sh and checked automatically; it last passed a check on Sep 29, 2026. Fous is not affiliated with crt.sh.
Actions
Search certificates
1 credit per runFind issued certificates and the domain names they reveal on crt.sh. Expired certificates are excluded by default; results are limited to the newest matching certificates.
What you provide
| Field | Type | Required | Description |
|---|---|---|---|
Domaindomain | Text | Required | Domain to search, for example example.com.Example: example.com |
Max Resultsmax_results | Number | Optional | Maximum number of certificates to return, for example 100.Example: 100 |
Include Expiredinclude_expired | Yes or no | Optional | Include expired certificates, for example true.Example: Yes |
What you get
| Field | Type | Description |
|---|---|---|
Subdomainssubdomains | List | Unique matching DNS names, sorted A-Z, including wildcards and the root domain when present. |
Certificatescertificates | List | Matching unique certificates, newest first. |
Linkcertificates[].link | Text | Certificate page on crt.sh.Example: https://crt.sh/?id=29557945233 |
Crt Sh IDcertificates[].crt_sh_id | Number | Example: 29557945233 |
Valid Fromcertificates[].valid_from | Date | Example: 2026-09-24 |
Valid Untilcertificates[].valid_until | Date | Example: 2026-12-21 |
Names Coveredcertificates[].names_covered | List | DNS names listed on the certificate. |
Serial Numbercertificates[].serial_number | Text | Example: 2caeeaf0743459d7e5f82a75123c58f3 |
Issuer Organizationcertificates[].issuer_organization | Text | Organization that issued the certificate.Example: Sectigo Limited |
Example result
For Domain: example.com
{
"subdomains": [
"*.example.com",
"example.com",
"www.example.com"
],
"certificates": [
{
"link": "https://crt.sh/?id=29557945233",
"crt_sh_id": 29557945233,
"valid_from": "2026-09-24",
"valid_until": "2026-12-21",
"names_covered": [
"*.example.com",
"example.com"
],
"serial_number": "2caeeaf0743459d7e5f82a75123c58f3",
"issuer_organization": "Sectigo Limited"
},
{
"link": "https://crt.sh/?id=28361996564",
"crt_sh_id": 28361996564,
"valid_from": "2026-07-29",
"valid_until": "2026-10-27",
"names_covered": [
"*.example.com",
"example.com"
],
"serial_number": "0624d0ab311558780b7d5213b9631831",
"issuer_organization": "SSL Corporation"
},
{
"link": "https://crt.sh/?id=28361996505",
"crt_sh_id": 28361996505,
"valid_from": "2026-07-29",
"valid_until": "2026-10-27",
"names_covered": [
"*.example.com",
"example.com"
],
"serial_number": "62546d11b12882adbce18f65f9372286",
"issuer_organization": "SSL Corporation"
}
]
}For developers
Run this workflow from your own code. In Studio, turn on Developer mode and create an API key.
# First set your key: export FOUS_API_KEY='YOUR_FOUS_API_KEY'
: "${FOUS_API_KEY:?Set FOUS_API_KEY before running this example}"
curl 'https://api.fous.com/v1/query' \
--fail-with-body --silent --show-error --max-time 120 \
-H "Authorization: Bearer $FOUS_API_KEY" \
-H 'Content-Type: application/json' \
--data-raw '{
"api": "@crt-sh",
"visibility": "public",
"operation": "search_certificates",
"version": 1,
"input": {
"domain": "example.com",
"max_results": 100,
"include_expired": true
},
"response": {
"format": "json"
}
}'What you can do with it
- Review certificates issued for a domain
- Identify subdomains revealed by certificates
- Check certificate validity dates
- Compare certificate issuer organizations
- Review names covered by certificates
Questions
Is Fous affiliated with crt.sh?
No. Fous is not affiliated with crt.sh. This workflow reads the public crt.sh website and returns its data.
How much does it cost?
Each run costs 1 credit. With pay-as-you-go, a credit costs 1¢; monthly plans cost less per credit.
Do I need a crt.sh account?
No. You only need a Fous account.
How current is the data?
Fous gets the data from crt.sh when you run it; repeating the same request within a day may return the saved result. Fous checks this workflow automatically; it last passed a check on Sep 29, 2026.
What certificates were issued for a domain?
Search certificates returns matching certificates for the required domain, newest first.
Which subdomains do certificates reveal?
Search certificates returns unique matching DNS names, including wildcards and the root domain when present.