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

muni.cz · 147.251.5.239:443

Verified

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

Subject
CN=www.muni.cz
Issuer
C=US O=Let's Encrypt CN=YR1
Valid from
2026-10-26T20:02:38+00:00
Expires
2027-01-24T20:02:37+00:00
Days remaining
78
Serial (hex)
05470BC111E370C3204D1C31FB792B291F75
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:absolventi.muni.cz, DNS:akad.rect.muni.cz, DNS:bydleni.muni.cz, DNS:cpp.rect.muni.cz, DNS:darujmuni.cz, DNS:dostudujto.cz, DNS:followmasaryk.cz, DNS:jednoucho.muni.cz, DNS:muni.cz, DNS:openday.muni.cz, DNS:poradimevamlip.cz, DNS:provoz.rect.muni.cz, DNS:senat.muni.cz, DNS:spolek.muni.cz, DNS:spolky.muni.cz, DNS:stansemistrem.cz, DNS:strategie.rect.muni.cz, DNS:supo.muni.cz, DNS:taprava.muni.cz, DNS:tapravamuni.cz, DNS:tsp.muni.cz, DNS:vyzkum.rect.muni.cz, DNS:www.absolventi.muni.cz, DNS:www.bydleni.muni.cz, DNS:www.darujmuni.cz, DNS:www.dostudujto.cz, DNS:www.followmasaryk.cz, DNS:www.jednoucho.muni.cz, DNS:www.muni.cz, DNS:www.openday.muni.cz, DNS:www.poradimevamlip.cz, DNS:www.senat.muni.cz, DNS:www.spolek.muni.cz, DNS:www.spolky.muni.cz, DNS:www.stansemistrem.cz, DNS:www.strategie.rect.muni.cz, DNS:www.tapravamuni.cz, DNS:www.tsp.muni.cz

SHA-256 fingerprint

28:FD:9E:6D:71:E8:40:19:51:82:AC:81:8F:6E:D6:EC:F3:AC:FF:77:02:E6:58:74:D3:6B:5D:FC:6D:1B:BD:28
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
D9:03:5A:C2:7F:7D:5A:0A:4B:A3:CD:D3:02:8B:AE:B1:1E:0B:21:3E
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:absolventi.muni.cz, DNS:akad.rect.muni.cz, DNS:bydleni.muni.cz, DNS:cpp.rect.muni.cz, DNS:darujmuni.cz, DNS:dostudujto.cz, DNS:followmasaryk.cz, DNS:jednoucho.muni.cz, DNS:muni.cz, DNS:openday.muni.cz, DNS:poradimevamlip.cz, DNS:provoz.rect.muni.cz, DNS:senat.muni.cz, DNS:spolek.muni.cz, DNS:spolky.muni.cz, DNS:stansemistrem.cz, DNS:strategie.rect.muni.cz, DNS:supo.muni.cz, DNS:taprava.muni.cz, DNS:tapravamuni.cz, DNS:tsp.muni.cz, DNS:vyzkum.rect.muni.cz, DNS:www.absolventi.muni.cz, DNS:www.bydleni.muni.cz, DNS:www.darujmuni.cz, DNS:www.dostudujto.cz, DNS:www.followmasaryk.cz, DNS:www.jednoucho.muni.cz, DNS:www.muni.cz, DNS:www.openday.muni.cz, DNS:www.poradimevamlip.cz, DNS:www.senat.muni.cz, DNS:www.spolek.muni.cz, DNS:www.spolky.muni.cz, DNS:www.stansemistrem.cz, DNS:www.strategie.rect.muni.cz, DNS:www.tapravamuni.cz, DNS:www.tsp.muni.cz
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr1.c.lencr.org/118.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 44:C2:BD:0C:E9:14:0E:64:A5:C9:4A:01:93:0A:5A:A1: BB:35:97:0E:00:EE:11:16:89:68:2A:1C:44:D7:B5:66 Timestamp : Oct 26 21:01:09.007 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:5D:9F:4D:25:4B:B0:3A:A1:8C:BC:69:E4: 73:BB:A7:20:62:B8:37:CE:8A:8A:B8:73:5A:6C:B6:04: A8:92:A6:2F:02:21:00:94:B2:AC:30:0C:1A:92:15:D1: E8:1D:0F:9D:23:D4:35:79:31:4C:98:F8:13:9D:2D:CF: 11:2F:B6:B8:5E:A0:C4 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 1A:8B:9D:6B:8D:D7:91:D1:CD:05:49:ED:B6:03:55:D6: 06:B6:4F:AD:30:DB:71:FE:78:8F:0F:C7:C8:FB:C4:B1 Timestamp : Oct 26 21:01:10.740 2026 GMT Extensions: 00:00:05:00:0D:E8:8F:B3 Signature : ecdsa-with-SHA256 30:46:02:21:00:D2:7B:2B:23:54:CA:5C:A3:B9:9A:9C: 2B:B2:D7:13:13:AA:CC:27:45:DE:F4:CA:72:26:4F:09: FB:D3:ED:9F:2B:02:21:00:84:A5:73:43:74:31:B2:F3: 5C:C6:E1:DD:47:B7:B0:29:49:9A:AE:B1:53:B3:4F:6A: 9B:9E:77:22:81:F5:08:CA
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-11-07T14:53:08+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
665
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
2126
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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