How is seznam.cz?

Be careful risk 20/100

Registered 30 years ago, on no blocklists we checked, no valid HTTPS certificate, the site answered 200 in 882 ms.

Why

02050100

finecarefulhigh risk

+20No valid HTTPS certificate.

Rule-based: domain age, blocklists, TLS. A heuristic, not a guarantee.

The home page, rendered by how.is in a sandboxed browser. Nothing on it is clickable here.

Site

200

882 ms · ends at www.seznam.cz

HTTPS

invalid

Could not resolve host (EREFUSED)

Age

30 years

registered 1996-10-07

Blocklists

listings across 5 lists

Everything we looked at

DNS records6 record types

A	77.75.77.222 77.75.79.222
AAAA	2a02:598:2::1222 2a02:598:a::79:222
MX	20 mx2.seznam.cz 10 mx1.seznam.cz
NS	ams.seznam.cz ans.seznam.cz
TXT	facebook-domain-verification=hp0jkbs2ikx5c9hv3r0cwcyvi2c2jm yahoo-verification-key=rIVkIfpCmZr9Wlk/ixIMiDw3Gdv8aIr0gxXkfzWe6+Y= google-site-verification=v2WaAYaKuekbWHJu29R0b1IbBY2-pInEXYWbh_1_V2M google-site-verification=a9t5IHxxjmCtKh9OOuqIGQBo1JUNQC1eEzhCY7x2Lts v=spf1 mx ip4:77.75.78.0/23 ip4:77.75.76.0/23 ip6:2a02:598::/32 ?all google-site-verification=e3xWgDmkjVzej4PsMZgvtPhUiJLFAK5rdx-zdmeBYjg
CAA	{'type': 'CAA', 'iodef': 'mailto:abuse-caa@firma.seznam.cz', 'critical': 0} {'type': 'CAA', 'issue': 'letsencrypt.org;validationmethods=dns-01', 'critical': 0}

RegistrationSeznam.cz, a.s.

registrar	Seznam.cz, a.s.
registered	1996-10-07
expires	2027-10-28
last changed	2022-09-05
nameservers	ams.seznam.cz ans.seznam.cz
status	server transfer prohibited

registered 1996-10-07expires 2027-10-28

HTTPS certificatenot valid

valid	no
problem	Could not resolve host (EREFUSED)

DNSSECsecure

Domain is properly signed — chain validated by an independent validating resolver

. → cz → seznam.cz

Email authenticationpoor

SPF	warning `v=spf1 mx ip4:77.75.78.0/23 ip4:77.75.76.0/23 ip6:2a02:598::/32 ?all`
DMARC	warning policy none
DKIM	none of 1 common selectors

Whether mail claiming to be from this domain can be checked as genuine.

Security scoregrade B · 156/205

Basic Security

10/40missing: DNSSEC Enabled, Nameserver Diversity

Record Security

31/45missing: SPF Record, DMARC Record, DKIM Presence

Advanced Security

20/25missing: SOA Record Configuration

Domain Reputation

50/50

Threat Detection

45/45missing: Domain Age Check

Blocklists0 listings · 8 lookups

SURBL MultidomainURIBL MultidomainSpamCop77.75.77.222Barracuda77.75.77.222UCEPROTECT Level 177.75.77.222SpamCop77.75.79.222Barracuda77.75.79.222UCEPROTECT Level 177.75.79.222

Green: clean. Red: listed. Grey: the list did not answer.

Ask it yourself

Agents get this as data. Bought through the API, the checks behind this page cost $0.070: profile $0.025 + trust $0.020 + screenshot $0.020 + site status $0.005.

curl "https://how.is/v1/domain/trust?domain=seznam.cz" \ -H "Authorization: Bearer $HOWIS_KEY" # or pay per call in USDC (x402), no key: the 402 tells your agent the price curl -i "https://how.is/v1/domain/profile?domain=seznam.cz"

MCP: add https://how.is/mcp to Claude, Codex or Cursor (one-line install) and ask for domain_trust on seznam.cz. Reference: /llms.txt.

Watch seznam.cz. DNS read at the source every 5 minutes; certificate, blocklists and expiry every 6 hours. You get an email only when something changes.

Watch — $1 / 30 days