IPv4 Addresses
iol.cz. 1200 IN A 160.218.161.165
Name Servers
iol.cz. 1200 IN NS dns.iol.cz. iol.cz. 1200 IN NS ns2.tel.cz.
SOA Details
iol.cz. 1200 IN SOA dns.iol.cz. hostmaster.iol.cz. 2026072202 10800 3600 5184000 10800
Certificate Authority Authorization
No CAA records were returned at this registrable domain name. With no CAA policy, any public certificate authority (CA) may issue TLS certificates for names under this zone unless a parent publishes CAA; add issue / issuewild / iodef records to restrict issuance.
DMARC
Organizational policy (p): how receivers treat mail that fails aligned DMARC checks — none (monitor only), quarantine (often junk), or reject (block).
pct: share of mail that gets quarantine/reject; 100 = all failing messages (default).
100Aggregate DMARC reports (ZIP/XML). Optional but recommended for visibility.
Forensic (per-failure) reports. Often omitted for privacy or volume.
iol.cz. 1200 IN DMARC v=DMARC1; p=reject;
DKIM
No DKIM TXT with `v=DKIM1` was returned for the selector names we probe automatically.
SPF (Sender Policy Framework)
| Qualifier | Mechanism | Target / value | Valid | Details |
|---|---|---|---|---|
| + Pass | ip4 |
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| + Pass | ip4 |
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| + Pass | ip4 |
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| + Pass | ip4 |
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| + Pass | ip4 |
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| + Pass | ip4 |
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| + Pass | ip4 |
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| + Pass | ip4 |
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| + Pass | ip4 |
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| + Pass | ip4 |
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| + Pass | ip4 |
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| + Pass | a |
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| - Fail | all |
—
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iol.cz. 1200 IN TXT "v=spf1 ip4:194.228.2.86 ip4:194.228.2.87 ip4:194.228.2.91 ip4:194.228.2.92 ip4:194.228.41.112 ip4:160.218.161.71 ip4:160.218.161.72 ip4:160.218.161.73 ip4:160.218.11.33 ip4:160.218.11.38 ip4:160.218.11.39 a:aa.iol.cz -all"
MTA-STS
This hostname does not publish an MTA-STS policy (no v=STSv1 TXT at _mta-sts.<name> and/or no policy at https://mta-sts.<name>/.well-known/mta-sts.txt).
DNSSEC Public Keys
iol.cz. 1200 IN DNSKEY 257 3 5 AwEAAbaIHK3nAfY+qXSmKY0MR+OeyQ5znnPFhuyuvz477MkXe64PycylmP6Ex3SlBFdIsa38uJrUnX0a2h6ADRcHxQC/oW3ayMuCwjEc4WEZpkjvEEoW+F591UEhRiSqdDvwpqA/9C3rVbz43GLPsr14NyOA6kusquEgm3rjqO8dBKBxdPfHYUKHgfFXqwTWk+hFR1ktgUHSyiQSgFUBG3nc98E= iol.cz. 1200 IN DNSKEY 256 3 5 AwEAAei0TnZLRAMP4L0XlbEPJ4bEt1GOi+QMWl7mpG0BRXBm2kViyVvnaD8mrxGqUZcOpCIqPXvXU1Rc9Du2DkLrUCvDu+2+8XhzxhOYsrB1A4/fTfLpLBc0bHvCN65rBT9/pyEcQ14lb6xXTdWUtbsJpQRXc+gehizU5Gks0ty/sm+7
Delegation Signer
iol.cz. 1200 IN DS 2533 5 2 C562C2B5DCFDF5B1EAFDC57FFC4E903084F2DD498B6B6A3AA1FCC4596A07F233
DNSSEC Next Secure
iol.cz. 1200 IN NSEC _dmarc.iol.cz ["DNSKEY", "NSEC", "RRSIG", "TXT", "MX", "SOA", "NS", "A"]