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https://seznam.cz

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
90
GRADE
A
FIX
1
REVIEW
3
PASS
5
INFO
0
Probed from Singapore, Singapore
301 Moved Permanently
Checks
9
5 PASS 3 REVIEW 1 FIX
D
CDN & Delivery
Action
No CDN detected
FIX
No CDN detected
Warning::
No CDN detected
A CDN can significantly improve load times for users around the world by caching content at edge nodes closer to them.
No CDN detected

Consider using a CDN to improve global delivery speed and reduce origin load.

B
Redirect Chain
1 redirect(s), 1245 ms total
REVIEW
1 redirect(s), 1245 ms total
Info::
Single redirect
Got: https://seznam.cz → https://www.seznam.cz/ (301)
Info::
WWW normalization redirect
Warning::
Redirect overhead: 1245 ms total
Got: 1245 ms

https://seznam.cz

681 ms · HTTP/1.1

301

https://www.seznam.cz/

564 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://seznam.cz301681 msHTTP/1.1envoy
2https://www.seznam.cz/200564 msHTTP/1.1envoy

See the visual redirect chain in the HTTP Probe tab →

B
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
REVIEW
www/non-www, trailing slash, HTTP→HTTPS
Critical::
Both www and non-www versions serve content
Got: Both variants return 200 Expected: One variant 301-redirects to the other
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.seznam.cz/
200https://seznam.cz/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://seznam.cz/ → https://seznam.cz/

Consistent

B
TLS Certificate Expiry & Recommendations
76 days until leaf cert expires — 2 issues to address
REVIEW

Certificate validity

76
days left
0d 30d 60d 90d+

Recommended actions

  • Submit your domain to hstspreload.org to be added to the Chrome preload list
  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A+
DNS Records
2 A records, 176 ms lookup
PASS
2 A records, 176 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 77.75.79.222, 77.75.77.222
Info::
Has 2 IPv6 (AAAA) record(s)
Got: 2a02:598:2::1222, 2a02:598:a::79:222
Info::
2 nameserver(s) configured
Got: ams.seznam.cz, ans.seznam.cz
Info::
2 mail exchanger(s) configured
Info::
CAA records not checked
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Info::
SPF record present in TXT
Info::
DNS resolution time: 176 ms
Got: 176 ms
A77.75.79.222, 77.75.77.222
AAAA2a02:598:2::1222, 2a02:598:a::79:222
CNAME—
NSams.seznam.cz, ans.seznam.cz
MX
10 mx1.seznam.cz
20 mx2.seznam.cz
TXT
facebook-domain-verification=hp0jkbs2ikx5c9hv3r0cwcyvi2c2jm
yahoo-verification-key=rIVkIfpCmZr9Wlk/ixIMiDw3Gdv8aIr0gxXkfzWe6+Y=
google-site-verification=a9t5IHxxjmCtKh9OOuqIGQBo1JUNQC1eEzhCY7x2Lts
google-site-verification=e3xWgDmkjVzej4PsMZgvtPhUiJLFAK5rdx-zdmeBYjg
google-site-verification=v2WaAYaKuekbWHJu29R0b1IbBY2-pInEXYWbh_1_V2M
SPF v=spf1 mx ip4:77.75.78.0/23 ip4:77.75.76.0/23 ip6:2a02:598::/32 ?all
CAALookup not available with standard resolver
Resolved in 176 ms

CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.

Why this matters

Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.

A+
IPv6 Readiness
IPv6 reachable (157 ms)
PASS
IPv6 reachable (157 ms)
Info::
IPv6 is configured and reachable at 2a02:598:2::1222, 2a02:598:a::79:222
Got: 157 ms connect
IPv6 Ready
AAAA Records 2a02:598:2::1222, 2a02:598:a::79:222 Connection Reachable (157 ms)
A+
Crawlability
robots.txt present, sitemap with 37722 URLs
PASS
robots.txt present, sitemap with 37722 URLs
Info::
robots.txt is present
Got: 1024 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 37722 entries
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 1024 B Sitemaps referenced 2 User-agents *, SeznamBot, SeznamSocialBot, Twitterbot Blocking No — crawling allowed
User-agent: *
Disallow: /profil/*/libi-se
Disallow: /profil/*/prispevek/*
Disallow: /profil/*/sleduje
Disallow: /profil/*/sledujicich
Disallow: /firma/*
Disallow: /tv
Disallow: /r/
Disallow: /hobby/hledani
Disallow: /prozeny/hledani
Disallow: /horoskopy/hledani
Disallow: /magazin/hledani

User-agent: SeznamBot
Disallow: /profil/*/libi-se
Disallow: /profil/*/prispevek/*
Disallow: /profil/*/sleduje
Disallow: /profil/*/sledujicich
Disallow: /firma/*
Disallow: /tv
Disallow: /r/
Disallow: /hobby/hledani
Disallow: /prozeny/hledani
Disallow: /horoskopy/hledani
Disallow: /magazin/hledani

User-agent: SeznamSocialBot
Disallow: /tv
Disallow: /r/
Disallow: /hobby/hledani
Disallow: /prozeny/hledani
Disallow: /horoskopy/hledani
Disallow: /magazin/hledani

User-agent: Twitterbot
Disallow: /tv
Disallow: /r/
Disallow: /hobby/hledani
Disallow: /prozeny/hledani
Disallow: /horoskopy/hledani
Disallow: /magazin/hledani

Sitemap: https://www.seznam.cz/sitemaps/sitemap-tags.xml
Sitemap: https://www.seznam.cz/jizdnirady/sitemap.xml
sitemap.xml 200 OK
Type URL Set URLs 37722 entries Valid XML Yes
Sample URLs:
A+
Domain Intelligence
seznam.cz — via REG-SEZNAM, 29 years, 11 months old
PASS
seznam.cz — via REG-SEZNAM, 29 years, 11 months old
Info::
Domain registered until Oct 28, 2026 (6 months remaining)
Info::
DNSSEC is enabled
Info::
Registrar: REG-SEZNAM
Warning::
Registrar lock is NOT enabled
The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.
Domain expiry

135 days

October 28, 2026

SSL certificate

76 days

Issued by Let's Encrypt

Domain age

29 years, 11 months

Registered October 7, 1996

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

Unknown

2a02:598:2::1222

Registrar

REG-SEZNAM

Unlocked 2 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar REG-SEZNAM
Created October 7, 1996 (29 years, 11 months ago)
Expires October 28, 2026 (6 months)
Last Updated September 5, 2022
Name Servers ams.seznam.cz, ans.seznam.cz
DNSSEC Enabled
Hosting
IP Address 2a02:598:2::1222
Data source: rdap (0.9s)

The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.

Why this matters

Without registrar lock, an attacker who phishes your registrar credentials can transfer the domain in minutes — total brand hijack.

Learn more ▾

Registrar lock (clientTransferProhibited, clientUpdateProhibited, clientDeleteProhibited) requires extra verification before any transfer/update/delete. Every major registrar offers it free. Combined with 2FA on your registrar account, it's the strongest defense against domain hijacking.

Source: ICANN / domain-security best practice

A
HTTP Probe Timing
Total 663 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
171 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
161 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
169 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
664 ms
Total Time Total request time from DNS lookup through full response.
664 ms

Connection waterfall

DNS Lookup 171 ms TCP Connect 161 ms TLS Handshake 169 ms Server Processing 162 ms Content Transfer 0 ms
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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