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.xtom.email · 185.255.55.77:443

Verified

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

Subject
CN=mail.xtom.email
Issuer
C=US O=Let's Encrypt CN=YR2
Valid from
2026-09-05T23:30:31+00:00
Expires
2026-12-04T23:30:30+00:00
Days remaining
66
Serial (hex)
05E92F2A63391E46E4DA5A445AE91E45D167
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:autoconfig.cctld.com, DNS:autoconfig.doma.in, DNS:autoconfig.h.fo, DNS:autoconfig.xtom.email, DNS:autodiscover.cctld.com, DNS:autodiscover.doma.in, DNS:autodiscover.h.fo, DNS:autodiscover.xtom.email, DNS:mail.xtom.email

SHA-256 fingerprint

D3:D9:0F:BE:48:F3:49:C9:E6:4F:22:8C:50:08:0C:2B:C0:6C:4D:CB:BF:CE:1C:AA:E7:C3:9E:95:B0:47:9B:0E
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
62:72:9C:C8:B7:E8:2D:9E:0D:8F:88:30:95:39:AC:21:88:0D:82:27
authorityKeyIdentifier
40:15:2D:26:79:ED:32:20:9E:DF:9A:72:1D:D6:32:1F:81:0C:81:0C
authorityInfoAccess
CA Issuers - URI:http://yr2.i.lencr.org/
subjectAltName
DNS:autoconfig.cctld.com, DNS:autoconfig.doma.in, DNS:autoconfig.h.fo, DNS:autoconfig.xtom.email, DNS:autodiscover.cctld.com, DNS:autodiscover.doma.in, DNS:autodiscover.h.fo, DNS:autodiscover.xtom.email, DNS:mail.xtom.email
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr2.c.lencr.org/104.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 00:29:01.315 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:44:8F:8A:38:E4:63:A2:34:55:BA:68:40: 05:03:E4:40:D3:C7:71:50:6F:88:FC:A3:8D:01:98:4E: 21:95:F5:F9:02:20:6B:3B:BB:BA:45:DD:6B:69:D0:EE: CF:3D:A2:C0:45:CA:0A:AE:14:32:A4:88:4D:77:74:92: BD:FA:9D:4D:5E:9C Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 26:E3:64:6E:58:69:21:23:BC:34:3F:47:24:35:9B:37: 92:CD:24:5A:88:D8:15:D3:93:33:FD:99:18:AB:47:23 Timestamp : Sep 6 00:28:59.298 2026 GMT Extensions: 00:00:05:00:3D:8F:CB:8C Signature : ecdsa-with-SHA256 30:46:02:21:00:8A:7A:EF:9D:46:2B:53:B0:9D:61:42: 42:00:C6:D6:A8:DE:4E:56:B2:06:3B:DC:BF:A6:4F:F5: C4:7A:89:10:FA:02:21:00:E3:D5:8E:CD:D9:34:E7:04: EF:38:97:F3:8F:66:AD:0A:41:29:A4:CB:40:A4:1B:CD: 9A:0A:DE:68:93:17:23:EB
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-09-29T00:06:56+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=US O=Let's Encrypt CN=YR2
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
704
Serial (hex)
4EBD24947E24D394802D84A52FD5B319
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

23:8B:85:A0:09:9C:65:B9:70:47:7D:57:24:F1:A1:D4:75:CE:50:58:CF:FE:4E:FA:87:33:89:9B:DB:86:3C:47
Certificate extensions & PEM
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
40:15:2D:26:79:ED:32:20:9E:DF:9A:72:1D:D6:32:1F:81:0C:81:0C
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
2165
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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