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.dc-admin.de · 185.150.27.7:443

Verified

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

Subject
CN=mail.dc-admin.de
Issuer
C=US O=Let's Encrypt CN=YR1
Valid from
2026-08-04T10:56:24+00:00
Expires
2026-11-02T10:56:23+00:00
Days remaining
36
Serial (hex)
069CF411786A3D2E69E6BB35061585B97343
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:autoconfig.1337.gmbh, DNS:autoconfig.dc-admin.de, DNS:autoconfig.familie-spellerberg.de, DNS:autoconfig.globe-datacenter.com, DNS:autoconfig.mr.1337.gmbh, DNS:autoconfig.optimate-server.de, DNS:autoconfig.skylink-data-center.nl, DNS:autoconfig.xsserver.gmbh, DNS:autodiscover.1337.gmbh, DNS:autodiscover.dc-admin.de, DNS:autodiscover.familie-spellerberg.de, DNS:autodiscover.globe-datacenter.com, DNS:autodiscover.mr.1337.gmbh, DNS:autodiscover.optimate-server.de, DNS:autodiscover.skylink-data-center.nl, DNS:autodiscover.xsserver.gmbh, DNS:mail.dc-admin.de

SHA-256 fingerprint

C8:C9:7B:43:46:CA:9A:B2:ED:5E:2C:A6:5F:64:B0:34:B3:7C:DC:49:57:2A:3E:82:79:19:8D:1C:81:E1:19:E3
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
AD:75:F3:FB:15:8F:06:0D:98:8F:6B:79:F7:5F:A7:99:39:1F:8D:E3
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.1337.gmbh, DNS:autoconfig.dc-admin.de, DNS:autoconfig.familie-spellerberg.de, DNS:autoconfig.globe-datacenter.com, DNS:autoconfig.mr.1337.gmbh, DNS:autoconfig.optimate-server.de, DNS:autoconfig.skylink-data-center.nl, DNS:autoconfig.xsserver.gmbh, DNS:autodiscover.1337.gmbh, DNS:autodiscover.dc-admin.de, DNS:autodiscover.familie-spellerberg.de, DNS:autodiscover.globe-datacenter.com, DNS:autodiscover.mr.1337.gmbh, DNS:autodiscover.optimate-server.de, DNS:autodiscover.skylink-data-center.nl, DNS:autodiscover.xsserver.gmbh, DNS:mail.dc-admin.de
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr1.c.lencr.org/68.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 94:4E:43:87:FA:EC:C1:EF:81:F3:19:24:26:A8:18:65: 01:C7:D3:5F:38:02:01:3F:72:67:7D:55:37:2E:19:D8 Timestamp : Aug 4 11:54:54.846 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:28:2F:D4:E1:8E:33:F1:0A:F6:AF:7B:7E: CB:88:91:12:C6:0C:00:BF:70:9C:B3:12:AC:77:5F:74: 51:DB:2E:3E:02:21:00:B0:82:77:1B:C8:09:34:F8:16: 30:A9:83:01:8F:05:6F:FD:EF:CA:48:05:22:5E:48:01: 0A:A4:A3:A8:91:73:71 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 : Aug 4 11:54:55.602 2026 GMT Extensions: 00:00:05:00:31:3C:C1:1E Signature : ecdsa-with-SHA256 30:44:02:20:3F:CB:D0:D7:62:C0:68:F1:50:4E:D4:6F: E4:9A:26:4C:C0:54:6B:70:19:0E:00:D2:26:C4:53:01: 8A:73:38:3D:02:20:7B:28:20:01:14:EC:91:57:79:D4: DC:FE:1D:F9:0B:86:BB:D4:AE:D5:F8:25:90:49:3E:B1: A8:6B:1C:B3:D2:D7
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-09-27T09:23:50+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
706
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
2167
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

Registration / WHOIS →DNS records →