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
2026-09-01T00:00:00+00:00
Expires
2026-11-29T23:59:59+00:00
Days remaining
68
Serial (hex)
A59EBDB596751DB7F5C095079613953C
Signature
ecdsa-with-SHA256
Public key
EC 256 prime256v1

Subject alternative names (SAN)

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

SHA-256 fingerprint

46:B6:01:EE:08:B4:18:CF:8A:3A:1E:BF:E6:70:BA:5C:E4:3B:B0:5A:91:7F:A8:B2:DD:08:7A:30:47:1C:FC:63
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
66:98:EC:4C:11:35:F7:4B:50:84:8B:A8:1C:36:65:D0:17:56:D4:E0
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
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D7:6D:7D:10:D1:A7:F5:77:C2:C7:E9:5F:D7:00:BF:F9: 82:C9:33:5A:65:E1:D0:B3:01:73:17:C0:C8:C5:69:77 Timestamp : Sep 1 00:10:32.017 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:7A:BB:A0:82:C9:0B:1A:A7:EA:66:4E:EC: FB:01:BF:53:1C:F2:D6:56:D4:11:3D:3A:92:36:E0:BC: 65:63:BA:79:02:21:00:B3:37:AC:9A:5D:BB:45:D5:72: F4:96:DB:DF:39:46:33:83:87:EF:41:05:1E:67:F1:F0: 79:94:BE:CB:39:79:E6 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : C8:A3:C4:7F:C7:B3:AD:B9:35:6B:01:3F:6A:7A:12:6D: E3:3A:4E:43:A5:C6:46:F9:97:AD:39:75:99:1D:CF:9A Timestamp : Sep 1 00:10:31.981 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:70:B1:0B:F0:7D:54:AE:11:C1:AA:2A:9E: 25:37:F8:D6:3D:45:2E:B9:D5:17:F9:2B:78:7C:89:95: 0F:10:8A:99:02:21:00:D1:C9:BD:67:73:B1:71:FF:03: DB:82:AD:2C:F5:B1:0E:24:DF:2A:30:4D:8C:6D:56:D7: D3:25:CF:75:A3:37:B6
subjectAltName
DNS:github.com, DNS:www.github.com
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-09-22T17:14:20+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
3468
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
4136
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.

View certificate JSON

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