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

mail.tejo.pro · 143.20.12.100:443

Verified

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

Subject
CN=mail.tejo.pro
Issuer
C=US O=Let's Encrypt CN=YR1
Valid from
2026-09-06T15:29:23+00:00
Expires
2026-12-05T15:29:22+00:00
Days remaining
33
Serial (hex)
05A6FFF82EC0585116F67CDF35E543DD2176
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:autoconfig.atlantix.pt, DNS:autoconfig.glitchrp.pt, DNS:autoconfig.tejo.pro, DNS:autoconfig.xn--joorodrigues-3bb.pt, DNS:autodiscover.atlantix.pt, DNS:autodiscover.glitchrp.pt, DNS:autodiscover.tejo.pro, DNS:autodiscover.webtejo.pt, DNS:autodiscover.xn--joorodrigues-3bb.pt, DNS:mail.tejo.pro

SHA-256 fingerprint

2B:23:CF:8E:6B:C7:77:43:ED:34:4C:3C:E6:2F:1F:F3:88:18:A7:D2:1F:84:82:22:AF:7E:FE:3D:D8:DA:1A:85
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
E5:0F:A4:33:C2:A6:86:21:42:6B:DD:29:A2:5F:F6:CA:82:BD:F2:94
authorityKeyIdentifier
1F:2F:35:BE:46:14:82:CD:40:B1:AE:79:2C:55:78:FA:F7:D4:68:FB
authorityInfoAccess
CA Issuers - URI:http://yr1.i.lencr.org/
subjectAltName
DNS:autoconfig.atlantix.pt, DNS:autoconfig.glitchrp.pt, DNS:autoconfig.tejo.pro, DNS:autoconfig.xn--joorodrigues-3bb.pt, DNS:autodiscover.atlantix.pt, DNS:autodiscover.glitchrp.pt, DNS:autodiscover.tejo.pro, DNS:autodiscover.webtejo.pt, DNS:autodiscover.xn--joorodrigues-3bb.pt, DNS:mail.tejo.pro
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr1.c.lencr.org/119.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D8:09:55:3B:94:4F:7A:FF:C8:16:19:6F:94:4F:85:AB: B0:F8:FC:5E:87:55:26:0F:15:D1:2E:72:BB:45:4B:14 Timestamp : Sep 6 16:27:53.504 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:B0:6D:38:10:DC:47:0A:4C:54:EF:0E: 37:D5:36:56:48:49:F3:E0:C1:28:5F:1C:5C:15:BA:B4: 09:DF:C2:1D:C3:02:20:31:6E:53:2A:6B:E6:59:07:3B: 9F:70:3B:14:85:47:70:10:FC:5C:5D:65:34:C8:D6:8E: 53:90:75:E8:08:C6:7A Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 1A:8B:9D:6B:0F:FE:BF:81:B4:79:39:C6:D2:31:0A:86: D6:D1:02:D4:F0:46:E2:18:2C:9D:E3:5F:5E:26:25:EF Timestamp : Sep 6 16:27:53.626 2026 GMT Extensions: 00:00:05:00:3D:34:CE:1C Signature : ecdsa-with-SHA256 30:45:02:20:66:98:40:09:95:FD:F2:5A:8E:11:8B:5C: 8A:CD:F4:43:D8:F4:D6:25:60:1E:72:0D:81:17:8D:6A: EB:9C:E3:15:02:21:00:B7:CF:06:AC:39:E4:C0:12:6B: 44:45:69:67:B5:F1:6F:E7:74:B7:F8:BE:5F:1D:FC:FF: BE:5E:CD:BD:52:D2:12
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-11-02T00:27:48+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=US O=Let's Encrypt CN=YR1
Issuer
C=US O=ISRG CN=Root YR
Valid from
2025-09-03T00:00:00+00:00
Expires
2028-09-02T23:59:59+00:00
Days remaining
670
Serial (hex)
A20253F15F2691C05DC1CE13B9BCCA4E
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

13:94:96:34:D9:9C:D6:FD:6A:A8:0B:C0:34:FE:FA:CC:EB:19:69:FE:EF:98:65:86:71:3E:CD:BB:05:75:8D:3F
Certificate extensions & PEM
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
1F:2F:35:BE:46:14:82:CD:40:B1:AE:79:2C:55:78:FA:F7:D4:68:FB
authorityKeyIdentifier
DE:E7:5B:60:D0:22:6D:40:28:7D:3F:0D:01:FE:A4:B5:52:B4:51:94
authorityInfoAccess
CA Issuers - URI:http://yr.i.lencr.org/
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr.c.lencr.org/ 
-----BEGIN CERTIFICATE-----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=
-----END CERTIFICATE-----

Chain certificate 2

Subject
C=US O=ISRG CN=Root YR
Issuer
C=US O=Internet Security Research Group CN=ISRG Root X1
Valid from
2026-05-13T00:00:00+00:00
Expires
2032-09-02T23:59:59+00:00
Days remaining
2131
Serial (hex)
F24B6D17F9D9AD7CB1C9FEA78782699F
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

07:26:39:D0:B1:40:D5:BF:FA:E1:6A:D9:C3:F6:CC:60:86:04:06:21:F5:1E:E6:1A:6D:46:A8:91:5C:07:CF:76
Certificate extensions & PEM
keyUsage
Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:TRUE
subjectKeyIdentifier
DE:E7:5B:60:D0:22:6D:40:28:7D:3F:0D:01:FE:A4:B5:52:B4:51:94
authorityKeyIdentifier
79:B4:59:E6:7B:B6:E5:E4:01:73:80:08:88:C8:1A:58:F6:E9:9B:6E
authorityInfoAccess
CA Issuers - URI:http://x1.i.lencr.org/
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://x1.c.lencr.org/ 
-----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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