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

dns3.mserwis.pl · 185.221.110.3:443

Unverified
Certificate verification failed. These are unverified certificate details presented by the server. Peer certificate subjectAltName did not match expected name `dns3.mserwis.pl'

Certificate verification failed

Subject
CN=autoconfig.cpanel11.mserwis.pl
Issuer
C=US O=Let's Encrypt CN=YR2
Valid from
2026-10-17T12:29:33+00:00
Expires
2027-01-15T12:29:32+00:00
Days remaining
72
Serial (hex)
066582304F6608246188E9EEF2C12EE56FBA
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:autoconfig.cpanel11.mserwis.pl, DNS:cpanel11.mserwis.pl, DNS:cpcalendars.cpanel11.mserwis.pl, DNS:cpcontacts.cpanel11.mserwis.pl, DNS:ipv6.cpanel11.mserwis.pl, DNS:webdisk.cpanel11.mserwis.pl, DNS:webmail.cpanel11.mserwis.pl, DNS:www.cpanel11.mserwis.pl

SHA-256 fingerprint

2A:DC:DA:3C:9C:4F:AC:05:7A:F7:A0:1F:78:0D:DE:C1:1B:37:D8:D5:86:D9:3A:81:3F:93:75:90:BA:AD:F5:0C
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
34:A7:5F:BC:37:2F:CB:39:91:F9:85:30:F7:06:F5:A5:2A:1F:F5:E0
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.cpanel11.mserwis.pl, DNS:cpanel11.mserwis.pl, DNS:cpcalendars.cpanel11.mserwis.pl, DNS:cpcontacts.cpanel11.mserwis.pl, DNS:ipv6.cpanel11.mserwis.pl, DNS:webdisk.cpanel11.mserwis.pl, DNS:webmail.cpanel11.mserwis.pl, DNS:www.cpanel11.mserwis.pl
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr2.c.lencr.org/59.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 00:1A:5D:1A:1C:2D:93:75:B6:48:55:78:F8:2F:71:A1: AE:6E:EF:39:7D:29:7C:8A:E3:15:7B:CA:DE:E1:A0:1E Timestamp : Oct 17 13:28:03.762 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:7B:D1:26:8D:5B:16:B2:51:F5:D6:88:D9: 26:D6:F5:3A:99:9D:5A:2D:9B:84:FD:17:FF:61:8F:80: 86:78:E4:DD:02:20:1F:95:50:89:FA:C2:0C:54:89:1F: FF:20:60:24:DA:46:0C:42:7A:27:EB:F3:B3:F4:BE:EE: 63:22:21:1D:55:2F Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 8E:CA:47:0B:AC:DE:6A:F3:A2:06:B0:A4:7A:84:B7:46: FE:1F:C6:BF:95:3E:25:E6:9B:4E:E4:02:48:F3:C6:E8 Timestamp : Oct 17 13:28:04.724 2026 GMT Extensions: 00:00:05:00:26:74:9C:3E Signature : ecdsa-with-SHA256 30:45:02:20:22:CD:46:24:A7:78:2F:C8:B1:BD:54:3B: AB:F2:46:D4:25:46:CE:00:A4:0A:90:43:B4:40:2C:2D: 9D:B0:82:44:02:21:00:BF:DA:06:80:B8:7A:F1:D4:06: A0:F9:4D:47:67:E2:3D:87:BA:94:96:33:82:27:D2:34: 36:FA:27:7D:F3:7E:87
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-11-03T22:48:40+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
669
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
2130
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-----
MIIF9DCCA9ygAwIBAgIRAPJLbRf52a18scn+p4eCaZ8wDQYJKoZIhvcNAQELBQAw
TzELMAkGA1UEBhMCVVMxKTAnBgNVBAoTIEludGVybmV0IFNlY3VyaXR5IFJlc2Vh
cmNoIEdyb3VwMRUwEwYDVQQDEwxJU1JHIFJvb3QgWDEwHhcNMjYwNTEzMDAwMDAw
WhcNMzIwOTAyMjM1OTU5WjAuMQswCQYDVQQGEwJVUzENMAsGA1UEChMESVNSRzEQ
MA4GA1UEAxMHUm9vdCBZUjCCAiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIB
ANvGJnN78CTJdWL3+eGfsLN5TrNBJs+VH9hRXqRbwxu9sGNiB0BD1fcOxbSUQCJI
M1xE13Db+5Cw1w0s0EBYsvuIP/6joF0w8cuImbgR1OGgYbSQ4OpzI+DG8SGuTlcE
873OCS+kh3srlo6vl43M5OJg4Aeo1sfHp6kTJDoIiFBNJAY+OKfX/FUvYKuhjT+n
o49lmqmupSBI5PkBQiqrEGtWU5uxU/cQWHGu8jSjFBznZqvbNPLMXMLFxCb3WTfr
JBXXjqvWG+v4bjzxjjeAtOlU7qarRDvNOyAuQYLln904M+faKx8hnLCpJ15ZqaEg
cNlY+9MMWcC5yvL2A2j3l9+2buggZX+dOE91zYmIdawTvSZuVvlbRrAlLxIB6pwM
BjneXCjYQ8+3BCCjssbSNpZU3hTcBDdhfAlEDlYr6pEatnMdmDT5BqnKC92bd0Eh
M1fbLHioLccLCuievT8ZkPhZrq7Mii7gNXAcUEAR8+lzYal+9zTg7C5DALyVOeG/
CqfRAMn1KSHCR0NSA6P8tn/mGRlnCct5rtVCLnVySVpU6H1qGg3DgTOuskf8eahT
MiYbI5ezPJmO5ertalskQ1utp74+eDy92PI4ftHKTbq9IWhH4YZKh3WnJEIt+oQv
lYZbY8tpEroKrFB6PFGzrJIDRyts4HqvuH52RFj2zv/BAgMBAAGjgeswgegwDgYD
VR0PAQH/BAQDAgEGMBMGA1UdJQQMMAoGCCsGAQUFBwMBMA8GA1UdEwEB/wQFMAMB
Af8wHQYDVR0OBBYEFN7nW2DQIm1AKH0/DQH+pLVStFGUMB8GA1UdIwQYMBaAFHm0
WeZ7tuXkAXOACIjIGlj26ZtuMDIGCCsGAQUFBwEBBCYwJDAiBggrBgEFBQcwAoYW
aHR0cDovL3gxLmkubGVuY3Iub3JnLzATBgNVHSAEDDAKMAgGBmeBDAECATAnBgNV
HR8EIDAeMBygGqAYhhZodHRwOi8veDEuYy5sZW5jci5vcmcvMA0GCSqGSIb3DQEB
CwUAA4ICAQA8spSI95KKfn2W6GMmDpHBJSPaLbsS3W93cijJCRCYAc1fsJgL1FIL
7C0C9ecPOdcwB2fi0Dk2p94j9iTJCxmt5CFSKLRWwnXT2MMSXexVxqoVB79BdWPx
VXETkVme/qYSAuKVHh5Ps+5BixgmwS1JkjSAc+MfrUbNssVEEnH0aEiAh+rotXAV
JSP/Ye7LJPEwD9DWG72vVWbhAcuOf5OLjz57Ctk7MgQHynZ7+PlHJtajroCaIbtC
r6tcZZaAwUQm+jQyeWdV+2hv9deOYFmKeQyjjcSrN5Nadrw+L9DZJLbA1HqeNvLh
BgqpP0fvJq2N6EtD574N6eMI7uMsJTnji2UDz9el5XLSv9fqJMuDQtYVb2oTNoKp
oUqhxPVC0aq4eG5MESaIdn8b5ZGSSeAJLMHXljEdlNza+ncfkviXk1POLnnFdvx8
/gk6M374WbLWFXw8N141B/Rl/tINGfl1TxOIiqtiMYkL02RSGb1kq34BL9NPP27z
RGMuHGnzS3hFIrRTfKxrzUZ9RzQWzEG3K6fJ3r2nqSltkeytis9DIBoFY9VmVyjL
M71DMi+y1+TRSJVClEMwvA4yL++7q9XZx5r5wBRWB4kQTKH5qyoZnDw7iiuh1lID
yDFx8r7i9vIJU5HS3moZLkYWAOilMaV9N56A9Bgb6dNcHkvg3NoaYA==
-----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 →