SSL Report:
ftp.k4.cz
(93.153.100.213)
Assessed on: Mon, 13 Oct 2025 00:24:04 UTC
| Clear cache
Summary
0
20
40
60
80
100
Certificate
Protocol Support
Key Exchange
Cipher Strength
Visit our documentation page
for more information, configuration guides, and books. Known issues are documented
here.
This server supports insecure cipher suites (see below for details). Grade set to F.
This server is vulnerable to the POODLE attack. If possible, disable SSL 3 to mitigate. Grade capped to C.
MORE INFO »
This server is vulnerable to the OpenSSL CCS vulnerability (CVE-2014-0224) and exploitable.
Grade set to F.
This server is vulnerable to the Heartbleed attack.
Grade set to F.
This server accepts RC4 cipher, but only with older protocols. Grade capped to B.
MORE INFO »
This server does not support Forward Secrecy with the reference browsers.
Grade capped to B.
MORE INFO »
This server's certificate chain is incomplete. Grade capped to B.
This server supports TLS 1.0 and TLS 1.1.
Grade capped to B. MORE INFO »
This server does not support TLS 1.3. MORE INFO »
Certificate #1: RSA 2048 bits (SHA256withRSA)
|
Server Key and Certificate #1
|
|
| Subject |
ftp.k4.cz
Fingerprint SHA256: 1f9b691d0c4e40f66bf4104b3bedebf3d703452fdcf3c5349c8253d7e7ab1de5 Pin SHA256: RAwYX8apUS+q+NK2ujrXwjtGv2iE8PFeZsdttw/jQH4= |
| Common names | ftp.k4.cz |
| Alternative names | ftp.k4.cz |
| Serial Number | 05fda7a5d616b9d924a898dcd3236f31 |
| Valid from | Mon, 17 Feb 2025 00:00:00 UTC |
| Valid until | Fri, 20 Mar 2026 23:59:59 UTC (expires in 5 months and 7 days) |
| Key | RSA 2048 bits (e 65537) |
| Weak key (Debian) | No |
| Issuer | RapidSSL TLS RSA CA G1
AIA: http://cacerts.rapidssl.com/RapidSSLTLSRSACAG1.crt |
| Signature algorithm | SHA256withRSA |
| Extended Validation | No |
| Certificate Transparency | Yes (certificate) |
| OCSP Must Staple | No |
| Revocation information |
CRL, OCSP CRL: http://cdp.rapidssl.com/RapidSSLTLSRSACAG1.crl OCSP: http://status.rapidssl.com |
| Revocation status | Good (not revoked) |
| DNS CAA | No (more info) |
| Trusted | Yes
Mozilla Apple Android Java Windows |
|
Additional Certificates (if supplied)
|
|
| Certificates provided | 1 (1559 bytes) |
| Chain issues | Incomplete |
Certification Paths |
Configuration
| Protocols | |
| TLS 1.3 | No |
| TLS 1.2 | Yes |
| TLS 1.1 | Yes |
| TLS 1.0 | Yes |
| SSL 3 INSECURE | Yes |
| SSL 2 | No |
| Cipher Suites | ||
|
# TLS 1.2 (server has no preference)
|
||
TLS_RSA_WITH_DES_CBC_SHA (0x9)
INSECURE
|
56 | |
TLS_RSA_WITH_3DES_EDE_CBC_SHA (0xa)
WEAK
|
112 | |
TLS_RSA_WITH_AES_128_CBC_SHA (0x2f)
WEAK
|
128 | |
TLS_RSA_WITH_CAMELLIA_128_CBC_SHA (0x41)
WEAK
|
128 | |
TLS_RSA_WITH_SEED_CBC_SHA (0x96)
WEAK
|
128 | |
TLS_RSA_WITH_AES_128_CBC_SHA256 (0x3c)
WEAK
|
128 | |
TLS_RSA_WITH_AES_128_GCM_SHA256 (0x9c)
WEAK
|
128 | |
TLS_RSA_WITH_RC4_128_MD5 (0x4)
INSECURE
|
128 | |
TLS_RSA_WITH_RC4_128_SHA (0x5)
INSECURE
|
128 | |
TLS_RSA_WITH_IDEA_CBC_SHA (0x7)
WEAK
|
128 | |
TLS_RSA_WITH_AES_256_CBC_SHA (0x35)
WEAK
|
256 | |
TLS_RSA_WITH_CAMELLIA_256_CBC_SHA (0x84)
WEAK
|
256 | |
TLS_RSA_WITH_AES_256_CBC_SHA256 (0x3d)
WEAK
|
256 | |
TLS_RSA_WITH_AES_256_GCM_SHA384 (0x9d)
WEAK
|
256 | |
|
# TLS 1.1 (server has no preference)
|
||
TLS_RSA_WITH_DES_CBC_SHA (0x9)
INSECURE
|
56 | |
TLS_RSA_WITH_3DES_EDE_CBC_SHA (0xa)
WEAK
|
112 | |
TLS_RSA_WITH_AES_128_CBC_SHA (0x2f)
WEAK
|
128 | |
TLS_RSA_WITH_CAMELLIA_128_CBC_SHA (0x41)
WEAK
|
128 | |
TLS_RSA_WITH_SEED_CBC_SHA (0x96)
WEAK
|
128 | |
TLS_RSA_WITH_RC4_128_MD5 (0x4)
INSECURE
|
128 | |
TLS_RSA_WITH_RC4_128_SHA (0x5)
INSECURE
|
128 | |
TLS_RSA_WITH_IDEA_CBC_SHA (0x7)
WEAK
|
128 | |
TLS_RSA_WITH_AES_256_CBC_SHA (0x35)
WEAK
|
256 | |
TLS_RSA_WITH_CAMELLIA_256_CBC_SHA (0x84)
WEAK
|
256 | |
|
# TLS 1.0 (server has no preference)
|
||
TLS_RSA_WITH_DES_CBC_SHA (0x9)
INSECURE
|
56 | |
TLS_RSA_WITH_3DES_EDE_CBC_SHA (0xa)
WEAK
|
112 | |
TLS_RSA_WITH_AES_128_CBC_SHA (0x2f)
WEAK
|
128 | |
TLS_RSA_WITH_CAMELLIA_128_CBC_SHA (0x41)
WEAK
|
128 | |
TLS_RSA_WITH_SEED_CBC_SHA (0x96)
WEAK
|
128 | |
TLS_RSA_WITH_RC4_128_MD5 (0x4)
INSECURE
|
128 | |
TLS_RSA_WITH_RC4_128_SHA (0x5)
INSECURE
|
128 | |
TLS_RSA_WITH_IDEA_CBC_SHA (0x7)
WEAK
|
128 | |
TLS_RSA_WITH_AES_256_CBC_SHA (0x35)
WEAK
|
256 | |
TLS_RSA_WITH_CAMELLIA_256_CBC_SHA (0x84)
WEAK
|
256 | |
|
# SSL 3 (server has no preference)
|
||
TLS_RSA_WITH_DES_CBC_SHA (0x9)
INSECURE
|
56 | |
TLS_RSA_WITH_3DES_EDE_CBC_SHA (0xa)
WEAK
|
112 | |
TLS_RSA_WITH_AES_128_CBC_SHA (0x2f)
WEAK
|
128 | |
TLS_RSA_WITH_CAMELLIA_128_CBC_SHA (0x41)
WEAK
|
128 | |
TLS_RSA_WITH_SEED_CBC_SHA (0x96)
WEAK
|
128 | |
TLS_RSA_WITH_RC4_128_MD5 (0x4)
INSECURE
|
128 | |
TLS_RSA_WITH_RC4_128_SHA (0x5)
INSECURE
|
128 | |
TLS_RSA_WITH_IDEA_CBC_SHA (0x7)
WEAK
|
128 | |
TLS_RSA_WITH_AES_256_CBC_SHA (0x35)
WEAK
|
256 | |
TLS_RSA_WITH_CAMELLIA_256_CBC_SHA (0x84)
WEAK
|
256 | |
| Handshake Simulation | |||
| Android 2.3.7 No SNI 2 | RSA 2048 (SHA256) | TLS 1.0 | TLS_RSA_WITH_RC4_128_MD5 No FS RC4 |
| Android 4.0.4 | RSA 2048 (SHA256) | TLS 1.0 | TLS_RSA_WITH_AES_256_CBC_SHA No FS |
| Android 4.1.1 | RSA 2048 (SHA256) | TLS 1.0 | TLS_RSA_WITH_AES_256_CBC_SHA No FS |
| Android 4.2.2 | RSA 2048 (SHA256) | TLS 1.0 | TLS_RSA_WITH_AES_256_CBC_SHA No FS |
| Android 4.3 | RSA 2048 (SHA256) | TLS 1.0 | TLS_RSA_WITH_AES_256_CBC_SHA No FS |
| Android 4.4.2 | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| Android 5.0.0 | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_CBC_SHA No FS |
| Android 6.0 | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_128_GCM_SHA256 No FS |
| Android 7.0 | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_128_GCM_SHA256 No FS |
| Android 8.0 | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_128_GCM_SHA256 No FS |
| Android 8.1 | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_128_GCM_SHA256 No FS |
| Android 9.0 | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_128_GCM_SHA256 No FS |
| Baidu Jan 2015 | RSA 2048 (SHA256) | TLS 1.0 | TLS_RSA_WITH_CAMELLIA_256_CBC_SHA No FS |
| BingPreview Jan 2015 | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| Chrome 49 / XP SP3 | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_128_GCM_SHA256 No FS |
| Chrome 69 / Win 7 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_128_GCM_SHA256 No FS |
| Chrome 70 / Win 10 | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_128_GCM_SHA256 No FS |
| Chrome 80 / Win 10 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_128_GCM_SHA256 No FS |
| Firefox 31.3.0 ESR / Win 7 | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_128_CBC_SHA No FS |
| Firefox 47 / Win 7 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_128_CBC_SHA No FS |
| Firefox 49 / XP SP3 | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_128_CBC_SHA No FS |
| Firefox 62 / Win 7 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_128_CBC_SHA No FS |
| Firefox 73 / Win 10 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_128_CBC_SHA No FS |
| Googlebot Feb 2018 | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_128_GCM_SHA256 No FS |
| IE 6 / XP No FS 1 No SNI 2 | RSA 2048 (SHA256) | SSL 3 | TLS_RSA_WITH_RC4_128_MD5 RC4 |
| IE 7 / Vista | RSA 2048 (SHA256) | TLS 1.0 | TLS_RSA_WITH_AES_128_CBC_SHA No FS |
| IE 8 / XP No FS 1 No SNI 2 | RSA 2048 (SHA256) | TLS 1.0 | TLS_RSA_WITH_RC4_128_MD5 RC4 |
| IE 8-10 / Win 7 R | RSA 2048 (SHA256) | TLS 1.0 | TLS_RSA_WITH_AES_256_CBC_SHA No FS |
| IE 11 / Win 7 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| IE 11 / Win 8.1 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| IE 10 / Win Phone 8.0 | RSA 2048 (SHA256) | TLS 1.0 | TLS_RSA_WITH_AES_128_CBC_SHA No FS |
| IE 11 / Win Phone 8.1 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_128_CBC_SHA256 No FS |
| IE 11 / Win Phone 8.1 Update R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| IE 11 / Win 10 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| Edge 15 / Win 10 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| Edge 16 / Win 10 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| Edge 18 / Win 10 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| Edge 13 / Win Phone 10 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| Java 6u45 No SNI 2 | RSA 2048 (SHA256) | TLS 1.0 | TLS_RSA_WITH_RC4_128_MD5 No FS RC4 |
| Java 7u25 | RSA 2048 (SHA256) | TLS 1.0 | TLS_RSA_WITH_AES_128_CBC_SHA No FS |
| Java 8u161 | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_CBC_SHA256 No FS |
| Java 11.0.3 | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| Java 12.0.1 | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| OpenSSL 0.9.8y | RSA 2048 (SHA256) | TLS 1.0 | TLS_RSA_WITH_AES_256_CBC_SHA No FS |
| OpenSSL 1.0.1l R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| OpenSSL 1.0.2s R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| OpenSSL 1.1.0k R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| OpenSSL 1.1.1c R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| Safari 5.1.9 / OS X 10.6.8 | RSA 2048 (SHA256) | TLS 1.0 | TLS_RSA_WITH_AES_128_CBC_SHA No FS |
| Safari 6 / iOS 6.0.1 | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_CBC_SHA256 No FS |
| Safari 6.0.4 / OS X 10.8.4 R | RSA 2048 (SHA256) | TLS 1.0 | TLS_RSA_WITH_AES_128_CBC_SHA No FS |
| Safari 7 / iOS 7.1 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_CBC_SHA256 No FS |
| Safari 7 / OS X 10.9 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_CBC_SHA256 No FS |
| Safari 8 / iOS 8.4 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_CBC_SHA256 No FS |
| Safari 8 / OS X 10.10 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_CBC_SHA256 No FS |
| Safari 9 / iOS 9 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| Safari 9 / OS X 10.11 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| Safari 10 / iOS 10 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| Safari 10 / OS X 10.12 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| Safari 12.1.2 / MacOS 10.14.6 Beta R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| Safari 12.1.1 / iOS 12.3.1 R | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| Apple ATS 9 / iOS 9 R |
Server sent fatal alert: handshake_failure |
||
| Yahoo Slurp Jan 2015 | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| YandexBot Jan 2015 | RSA 2048 (SHA256) | TLS 1.2 | TLS_RSA_WITH_AES_256_GCM_SHA384 No FS |
| (1) Clients that do not support Forward Secrecy (FS) are excluded when determining support for it. | |||
| (2) No support for virtual SSL hosting (SNI). Connects to the default site if the server uses SNI. | |||
| (3) Only first connection attempt simulated. Browsers sometimes retry with a lower protocol version. | |||
| (R) Denotes a reference browser or client, with which we expect better effective security. | |||
| (All) We use defaults, but some platforms do not use their best protocols and features (e.g., Java 6 & 7, older IE). | |||
| (All) Certificate trust is not checked in handshake simulation, we only perform TLS handshake. | |||
| Protocol Details | |
| Secure Renegotiation | Supported |
| Secure Client-Initiated Renegotiation | Yes |
| Insecure Client-Initiated Renegotiation | No |
| BEAST attack |
Not mitigated server-side (more info)
SSL 3: 0x9, TLS 1.0: 0x9
|
| POODLE (SSLv3) |
Vulnerable INSECURE (more info)
SSL 3: 0x9 |
| POODLE (TLS) | No (more info) |
| Zombie POODLE | No (more info)
TLS 1.2 : 0x000a
|
| GOLDENDOODLE | No (more info)
TLS 1.2 : 0x000a
|
| OpenSSL 0-Length | No (more info)
TLS 1.2 : 0x000a
|
| Sleeping POODLE | No (more info)
TLS 1.2 : 0x000a
|
| Downgrade attack prevention | No, TLS_FALLBACK_SCSV not supported (more info) |
| SSL/TLS compression | No |
| RC4 | Yes INSECURE (more info) |
| Heartbeat (extension) | Yes |
| Heartbleed (vulnerability) | Yes (more info) |
| Ticketbleed (vulnerability) | No (more info) |
| OpenSSL CCS vuln. (CVE-2014-0224) | Yes EXPLOITABLE (more info) |
| OpenSSL Padding Oracle vuln. (CVE-2016-2107) |
No (more info) |
| ROBOT (vulnerability) | No (more info) |
| Forward Secrecy | No WEAK (more info) |
| ALPN | No |
| NPN | No |
| Session resumption (caching) | No (IDs assigned but not accepted) |
| Session resumption (tickets) | Yes |
| OCSP stapling | No |
| Strict Transport Security (HSTS) | No |
| HSTS Preloading | Not in: Chrome Edge Firefox IE |
| Public Key Pinning (HPKP) | No (more info) |
| Public Key Pinning Report-Only | No |
| Public Key Pinning (Static) | No (more info) |
| Long handshake intolerance | No |
| TLS extension intolerance | No |
| TLS version intolerance | No |
| Incorrect SNI alerts | No |
| Uses common DH primes | No, DHE suites not supported |
| DH public server param (Ys) reuse | No, DHE suites not supported |
| ECDH public server param reuse | No, ECDHE suites not supported |
| Supported Named Groups | - |
| SSL 2 handshake compatibility | Yes |
|
HTTP Requests
|
|
1 https://ftp.k4.cz/
(HTTP/1.1 403 Forbidden)
| 1 | |
| Date | Mon, 13 Oct 2025 02:21:30 GMT | |
| Connection | Close | |
| Content-Length | 26 | |
| Content-Type | text/html | |
| Miscellaneous | |
| Test date | Mon, 13 Oct 2025 00:21:16 UTC |
| Test duration | 167.668 seconds |
| HTTP status code | 403 |
| HTTP server signature | - |
| Server hostname | - |
SSL Report v2.4.1