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web4u.cz

DNS Records

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Hosting & Network

web4u.cz runs on AS39790, with email configured.

Hosting network
AS39790AS39790
Managed DNS
Self-hosted / other
Email
Configured
IPv6 (AAAA)
Enabled
CAA pinning
Set

Sits alongside 3,527 other sites on AS39790. Stable here since we started watching (Jul 16, 2026).

The apex and www are the same hosting — the apex via A records.

DNS Records for web4u.cz

HostnameTypeTTLPriorityContent
web4u.czTXT0v=spf1 ip4:81.91.87.150 ip4:81.91.87.80 ip4:81.91.87.60 ip4:81.91.87.250 ip4:81.91.87.34/31 ip4:81.91.87.249 ip4:81.91.87.236 ip6:2001:1568:502:1::/64 ip6:2001:1568:502:2::/64 ip6:2001:1568:502:3::/64 ip6:2001:1568::7060 ip6:2001:1568::7236 ip4:77.78.104.121 ip6:2001:1528:137::a include:_spf.jupiter.salesmanago.pl -all
web4u.czTXT0smv=9d9c9b062c03b840
web4u.czTXT0zoho-verification=zb27107936.zmverify.zoho.eu
web4u.czTXT0MS=0394720CC11BB6E64FFED5064A40D0401C20807E
web4u.czMX010mx.web4u.cz
web4u.czAAAA02001:1568::19
web4u.czCAA00 issue letsencrypt.org
web4u.czNS0ns2.web4u.cz
web4u.czNS0ns.web4u.cz
web4u.czA081.91.86.19
web4u.czSOA14400ns.web4u.cz admin.web4u.cz 2026103002 14400 3600 1209600 14400
www.web4u.czA081.91.86.19
www.web4u.czAAAA02001:1568::19

Get alerted the moment web4u.cz's DNS changes

This page is today's snapshot. Turn on monitoring and we'll watch web4u.cz continuously, notifying you the moment anything moves across all three signals:

DNS monitor showing the hosting provider, current A, MX, NS, and TXT records, and a history of MX and TXT changes

Uptime

We visit the site from multiple regions worldwide and email you within minutes if it goes down, with a per-region breakdown so a real outage stands out from a regional blip.

DNS changes

We watch NS, MX, CAA, CNAME, TXT and A/AAAA records, and identify the host, network, and ASN behind them, so a real migration or hijack stands out from routine noise.

TLS certificate

We warn you 30, 14, 7, and 1 days before it expires, and flag it if the issuing authority changes or the certificate is unexpectedly replaced.

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Answers use the live DNS records shown on this page. AI-generated — double-check anything important.

About DNS Records

DNS (Domain Name System) records are instructions that provide information about a domain, including its IP addresses, mail servers, and other services. Common record types include:

  • SOA (Start of Authority) - Contains administrative information about the zone
  • NS (Nameserver) - Specifies authoritative nameservers for the domain
  • A (Address) - Maps a domain to an IPv4 address
  • AAAA - Maps a domain to an IPv6 address
  • CNAME (Canonical Name) - Creates an alias pointing to another domain
  • MX (Mail Exchange) - Specifies mail servers for the domain