Domain · Tranco #15,931

web4u.cz

web4u.cz is ranked #15,931 among the world's most-visited sites (Tranco). It resolves to 81.91.86.19, hosted on www.web4u.cz, and presents a TLS certificate issued by Let's Encrypt.

HTTP 301

Tranco rank	#15,931
IPv4	81.91.86.19
IPv6	2001:1568::19
Hosting / reverse DNS	www.web4u.cz
Nameservers	ns.web4u.cz, ns2.web4u.cz
Mail servers (MX)	mx.web4u.cz (10)
HTTP status	301 → https://www.web4u.cz/
Web server	openresty
Detected tech	openresty
TLS certificate	Let's Encrypt · expires 2026-09-25

Linked company

This domain's name matches a legal entity in our directory:

WEB4U

Notable DNS TXT records

MS=0394720CC11BB6E64FFED5064A40D0401C20807E
zoho-verification=zb27107936.zmverify.zoho.eu
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

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FAQ

What is the IP address of web4u.cz?

web4u.cz resolves to 81.91.86.19 (www.web4u.cz).

Who issued the SSL certificate for web4u.cz?

The TLS/SSL certificate for web4u.cz was issued by Let's Encrypt, valid until 2026-09-25.

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DNS/HTTP/TLS observed 2026-08-06; registration data via RDAP. Informational only. Download JSON · CSV · Browse domains