DNS Record Lookup
Look up DNS records including A, AAAA, MX, NS, SOA, CNAME, TXT, and CAA records for any domain
Hosting & Network
web4u.cz runs on AS39790, with email configured.
- Hosting network
- AS39790AS39790
- Managed DNS
- Self-hosted / other
- Configured
- IPv6 (AAAA)
- Enabled
- CAA pinning
- Set
Sits alongside 432 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
| Hostname | Type | TTL | Priority | Content |
|---|---|---|---|---|
| web4u.cz | CAA | 0 | 0 issue letsencrypt.org | |
| web4u.cz | NS | 0 | ns.web4u.cz | |
| web4u.cz | NS | 0 | ns2.web4u.cz | |
| web4u.cz | SOA | 14400 | ns.web4u.cz admin.web4u.cz 2026072002 14400 3600 1209600 14400 | |
| web4u.cz | MX | 0 | 10 | mx.web4u.cz |
| web4u.cz | A | 0 | 81.91.86.19 | |
| web4u.cz | AAAA | 0 | 2001:1568::19 | |
| web4u.cz | TXT | 0 | zoho-verification=zb27107936.zmverify.zoho.eu | |
| web4u.cz | TXT | 0 | MS=0394720CC11BB6E64FFED5064A40D0401C20807E | |
| web4u.cz | TXT | 0 | v=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.cz | TXT | 0 | smv=9d9c9b062c03b840 | |
| www.web4u.cz | A | 0 | 81.91.86.19 | |
| www.web4u.cz | AAAA | 0 | 2001:1568::19 |
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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:
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, DNSSEC, CNAME 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
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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