DNS
THE CERTIFICATE BEHIND THE CONNECTION

TLS certificate checker.

Inspect SSL/TLS certificates for any public domain or subdomain.

Checks HTTPS on port 443, including subject alternative names, validity dates and the presented chain.

SSL certificate

TLSv1.3

github.com · 140.82.121.4:443

Verified

Certificate chain, hostname and dates verified using this server’s CA store.

Subject
CN=github.com
Issuer
C=GB O=Sectigo Limited CN=Sectigo Public Server Authentication CA DV E36
Valid from
2026-10-30T00:00:00+00:00
Expires
2027-01-27T23:59:59+00:00
Days remaining
81
Serial (hex)
3E1D6026B4B0AEA279DCA2EFBBCED82B
Signature
ecdsa-with-SHA256
Public key
EC 256 prime256v1

Subject alternative names (SAN)

DNS:github.com, DNS:www.github.com

SHA-256 fingerprint

7D:C4:D8:5C:F1:E3:10:97:12:25:BC:9A:92:57:67:90:43:A2:43:D7:0A:3C:C2:A9:1C:C5:D3:89:89:2C:27:76
Certificate extensions & PEM
authorityKeyIdentifier
17:99:A8:04:C1:6F:E4:2D:70:A8:0A:10:3D:03:D3:E9:1A:B8:26:63
subjectKeyIdentifier
8C:B0:2A:1E:AE:EE:86:5D:00:01:35:B1:E5:8B:69:23:A5:3E:3C:71
keyUsage
Digital Signature
basicConstraints
CA:FALSE
extendedKeyUsage
TLS Web Server Authentication
certificatePolicies
Policy: 1.3.6.1.4.1.6449.1.2.2.7 CPS: https://sectigo.com/CPS Policy: 2.23.140.1.2.1
authorityInfoAccess
CA Issuers - URI:http://crt.sectigo.com/SectigoPublicServerAuthenticationCADVE36.crt OCSP - URI:http://ocsp.sectigo.com
subjectAltName
DNS:github.com, DNS:www.github.com
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 46:A2:39:67:C6:0D:B6:46:87:C6:6F:3D:F9:99:94:76: 93:A6:A6:11:20:84:57:D5:55:E7:E3:D0:A1:D9:B6:46 Timestamp : Oct 30 00:21:07.488 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:22:10:6D:BA:4E:92:A7:64:A4:C1:E5:10: EE:08:6A:A8:D4:13:9D:46:76:70:17:F2:54:DD:7C:9A: 9A:C9:E5:32:02:20:56:FA:B7:C4:9D:08:21:CC:3D:AC: 96:33:FC:0E:68:84:DF:AE:0E:78:D5:E3:44:B9:E8:4B: 8F:FE:10:39:81:31 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : A2:81:00:18:73:4E:17:6E:1D:47:E0:95:40:F3:81:BA: 54:66:97:CD:63:A8:43:50:71:6E:B8:09:4E:DA:F1:0D Timestamp : Oct 30 00:21:07.750 2026 GMT Extensions: 00:00:05:00:32:1E:E8:F2 Signature : ecdsa-with-SHA256 30:46:02:21:00:A9:1E:FB:C4:AE:D6:3A:CB:47:16:BB: 32:96:D4:25:3C:7A:8E:E5:40:25:68:3E:44:50:68:1F: 57:E4:B2:1E:78:02:21:00:93:75:72:2B:55:A3:45:97: 0A:B6:8D:5A:14:E9:EA:B7:2D:30:ED:80:16:C1:07:C0: 12:EA:92:87:B8:81:7D:E0
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-11-07T09:48:16+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=GB O=Sectigo Limited CN=Sectigo Public Server Authentication CA DV E36
Issuer
C=GB O=Sectigo Limited CN=Sectigo Public Server Authentication Root E46
Valid from
2021-03-22T00:00:00+00:00
Expires
2036-03-21T23:59:59+00:00
Days remaining
3422
Serial (hex)
36E059ED888DD57AEDD570B6727F9BDA
Signature
ecdsa-with-SHA384
Public key
EC 256 prime256v1

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

87:3F:0B:A8:0E:3A:C2:22:65:6D:FD:04:15:8C:C1:5C:29:27:D4:2D:5D:05:F0:1D:EE:4A:47:EB:43:A9:16:DF
Certificate extensions & PEM
authorityKeyIdentifier
D1:22:DA:4C:59:F1:4B:5F:26:38:AA:9D:D6:EE:EB:0D:C3:FB:A9:61
subjectKeyIdentifier
17:99:A8:04:C1:6F:E4:2D:70:A8:0A:10:3D:03:D3:E9:1A:B8:26:63
keyUsage
Digital Signature, Certificate Sign, CRL Sign
basicConstraints
CA:TRUE, pathlen:0
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
certificatePolicies
Policy: X509v3 Any Policy Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://crl.sectigo.com/SectigoPublicServerAuthenticationRootE46.crl
authorityInfoAccess
CA Issuers - URI:http://crt.sectigo.com/SectigoPublicServerAuthenticationRootE46.p7c OCSP - URI:http://ocsp.sectigo.com
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Chain certificate 2

Subject
C=GB O=Sectigo Limited CN=Sectigo Public Server Authentication Root E46
Issuer
C=US ST=New Jersey L=Jersey City O=The USERTRUST Network CN=USERTrust ECC Certification Authority
Valid from
2021-03-22T00:00:00+00:00
Expires
2038-01-18T23:59:59+00:00
Days remaining
4090
Serial (hex)
1A9EAFEC6DE8E19B5C193141B68D90DD
Signature
ecdsa-with-SHA384
Public key
EC 384 secp384r1

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

EA:6B:89:ED:69:07:A2:09:FF:91:88:67:6F:B1:64:E7:AC:ED:89:4B:89:96:DF:BE:5C:E5:BB:CC:22:DE:4D:DD
Certificate extensions & PEM
authorityKeyIdentifier
3A:E1:09:86:D4:CF:19:C2:96:76:74:49:76:DC:E0:35:C6:63:63:9A
subjectKeyIdentifier
D1:22:DA:4C:59:F1:4B:5F:26:38:AA:9D:D6:EE:EB:0D:C3:FB:A9:61
keyUsage
Digital Signature, Certificate Sign, CRL Sign
basicConstraints
CA:TRUE
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
certificatePolicies
Policy: X509v3 Any Policy
crlDistributionPoints
Full Name: URI:http://crl.usertrust.com/USERTrustECCCertificationAuthority.crl
authorityInfoAccess
OCSP - URI:http://ocsp.usertrust.com
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

One endpoint on port 443. Server-presented chain; no revocation, OCSP, CT or full TLS security scan.

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