IPLIST.NET - undefined.cz
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undefined.cz checked at 2025-11-27T19:31:42.830Z 351ms 80/80/80 100% R:17 allDone:true timedOut:false undefined.cz
| MX | mx.web4u.cz | ||||||
| A | 2001:1568::7012 🇨🇿 WEB4U | ||||||
| PTR | mx.web4u.cz | ||||||
| A | 81.91.87.12🇨🇿 WEB4U | ||||||
| PTR | mx.web4u.cz | ||||||
| NS | ns2.web4u.cz | ||||||
| A | 2a02:a40:100:28ff::12 🇨🇿 BlueTone-AS | ||||||
| PTR | ns2.web4u.cz | ||||||
| A | 85.207.53.12🇨🇿 BlueTone-AS | ||||||
| PTR | ns2.web4u.cz | ||||||
| NS | ns.web4u.cz | ||||||
| A | 2001:1568:fd::241 🇨🇿 WEB4U | ||||||
| PTR | ns.web4u.cz | ||||||
| A | 185.14.224.241🇨🇿 WEB4U | ||||||
| PTR | ns.web4u.cz | ||||||
| A | 2001:1568::14 🇨🇿 WEB4U | ||||||
| PTR | php7.web4u.cz | ||||||
| A | 81.91.86.14🇨🇿 WEB4U | ||||||
| PTR | php7.web4u.cz | ||||||
cz
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AI analysis
undefined.cz has two IP numbers: 2001:1568::14 and 81.91.86.14.
Other host names, for instance mail.rychlazelva.cz, vs233.server4u.cz, vs472.server4u.cz, mail.evanescence.cz and jawa.sk share IP numbers with undefined.cz.
undefined.cz's delegation uses two name servers: ns2.web4u.cz and ns.web4u.cz.
undefined.cz uses the same name server setup as other domains, such as prestige.cz, fein-naradi.cz, umb.cz, paex.cz and cutnest.com.
Host names with two IPs:
ns2.web4u.cz points to 2a02:a40:100:28ff::12 and 85.207.53.12
ns.web4u.cz points to 2001:1568:fd::241 and 185.14.224.241
A single mail server handles undefined.cz, mx.web4u.cz.
undefined.cz shares the same mail server setup as other domains, for instance slezanka.cz, kompendium.cz, forbrightsparks.com, belts.cz and rosendahl.cz.
undefined.cz shares some mail servers with other domains, at least in part; for example retailguide.cz and chataorlik.cz.
The host name mx.web4u.cz resolves to two IP numbers: 2001:1568::7012 and 81.91.87.12.