SSL Checker

Submit the Hostname and Port in the fields below. This checker supports SNI and STARTTLS.

Report

It's all good. We have not detected any issues.

Hostname:	Matches Common Name or/and SAN
Expired:	No (63 days till expiration)
Public Key:	We were unable to find any issues in the public key of end-entity certificate
Trusted:	Yes, we were able to verify the certificate
Self-Signed:	No, the end-entity certificate is not self-signed
Chain Issues:	No, we were unable to detect any issues in the certificate chain sent by the server
Weak signatures:	No, certificates sent by the server were not signed utilizing a weak hash function
OCSP Status:	OCSP Responder returned "good" status for the end-entity certificate

DNS Information

Resolves To:	77.75.77.222
Reverse IP lookup:	www.seznam.cz.
Nameserver:	ams.seznam.cz.
Nameserver:	ans.seznam.cz.

General Information

Common Name:	www.seznam.cz
SANs:	DNS:admin.seznam.czDNS:admin100-api.seznam.czDNS:admin100-node.seznam.czDNS:admin100.seznam.czDNS:api.seznam.czDNS:api2.seznam.czDNS:fallback.seznam.czDNS:ladime.seznam.czDNS:m.seznam.czDNS:seznam.czDNS:static-sorry-page-generator.seznam.czDNS:userweb-api.seznam.czDNS:userweb-api2.seznam.czDNS:wap.seznam.czDNS:www.seznam.cz Total number of SANs: 15
Signature Algorithm:	sha256WithRSAEncryption
Key Type:	RSA
Key size:	4096 bits
Serial Number:	4c5576b55e69c287c46ffca74686a93eb6b
Not Before:	Mar 28, 2024 06:02:24 GMT
Not After:	Jun 26, 2024 06:02:23 GMT
Number of certs:	2
Revocation Status:	good
OCSP Stapling:	Not Supported
Server:	envoy
HSTS:	max-age=63072000; includeSubDomains
HPKP:	Not Supported

Chain Information

Certificate # 1 - Common Name: www.seznam.cz

Decode this certificate for verbose information →

Subject Common Name	www.seznam.cz
Issuer Common Name	R3
Issuer Organization	Let's Encrypt
Not Before:	Mar 28, 2024 06:02:24 GMT
Not After:	Jun 26, 2024 06:02:23 GMT
Signature Algorithm:	sha256WithRSAEncryption
Serial Number:	4c5576b55e69c287c46ffca74686a93eb6b
SHA1 Fingerprint:	54:CB:30:89:44:C1:96:2E:27:94:14:7B:2D:F7:D7:32:72:CC:C3:21
MD5 Fingerprint:	F8:5F:C1:8D:BC:1C:5F:3A:69:C4:EF:0E:40:4C:AC:0E

Certificate # 2 - Common Name: R3

Decode this certificate for verbose information →

In place?	Yes, this certificate directly certifies the preceding one
Subject Common Name	R3
Subject Organization	Let's Encrypt
Issuer Common Name	ISRG Root X1
Issuer Organization	Internet Security Research Group
Not Before:	Sep 04, 2020 00:00:00 GMT
Not After:	Sep 15, 2025 16:00:00 GMT
Signature Algorithm:	sha256WithRSAEncryption
Serial Number:	912b084acf0c18a753f6d62e25a75f5a
SHA1 Fingerprint:	A0:53:37:5B:FE:84:E8:B7:48:78:2C:7C:EE:15:82:7A:6A:F5:A4:05
MD5 Fingerprint:	E8:29:E6:5D:7C:43:07:D6:FB:C1:3C:17:9E:03:7A:36

OpenSSL Handshake

depth=2 C = US, O = Internet Security Research Group, CN = ISRG Root X1
verify return:1
depth=1 C = US, O = Let's Encrypt, CN = R3
verify return:1
depth=0 CN = www.seznam.cz
verify return:1
CONNECTED(00000003)
OCSP response: no response sent
---
Certificate chain
 0 s:CN = www.seznam.cz
   i:C = US, O = Let's Encrypt, CN = R3
-----BEGIN CERTIFICATE-----
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2AAAAY6D3fW+AAAEAwBHMEUCIQD1kWQY3g/0A5Duftg3Ptj1TaqZgRRCM/q1XEhD
gUEQ/gIgK/pnfzo++awyha3V0hPvn99sWletaLlZyNZpta4o0G8wDQYJKoZIhvcN
AQELBQADggEBACB/3b+LMNHM+N196gaZwWB05buxhxwAm16rPgUXDNFkjgagOBrs
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EGHe8PA4BZESkH5046qramb1QJ3tVy20iZw=
-----END CERTIFICATE-----
 1 s:C = US, O = Let's Encrypt, CN = R3
   i:C = US, O = Internet Security Research Group, CN = ISRG Root X1
-----BEGIN CERTIFICATE-----
MIIFFjCCAv6gAwIBAgIRAJErCErPDBinU/bWLiWnX1owDQYJKoZIhvcNAQELBQAw
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nLRbwHOoq7hHwg==
-----END CERTIFICATE-----
---
Server certificate
subject=CN = www.seznam.cz

issuer=C = US, O = Let's Encrypt, CN = R3

---
No client certificate CA names sent
Peer signing digest: SHA256
Peer signature type: RSA-PSS
Server Temp Key: X25519, 253 bits
---
SSL handshake has read 3859 bytes and written 400 bytes
Verification: OK
---
New, TLSv1.3, Cipher is TLS_AES_256_GCM_SHA384
Server public key is 4096 bit
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
---
DONE