certuvmlyn.com - robtex.com
certuvmlyn.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 2001:1568::13🇨🇿 WEB4U2001:1568::/33 | ||||||
| PTR | php56.web4u.cz | ||||||
| A | 81.91.86.13🇨🇿 WEB4U81.91.80.0/21 | ||||||
| NS | ns2.web4u.cz ⭐ | ||||||
| A | 2a02:a40:100:28ff::12🇨🇿 BlueTone-AS2a02:a40::/32 Ceske Radiokomunikace, a.s. | ||||||
| PTR | ns2.web4u.cz | ||||||
| A | 85.207.53.12🇨🇿 BlueTone-AS85.207.0.0/16 BlueTone-CRa-CZ Fourth address block | ||||||
| PTR | ns2.web4u.cz | ||||||
| NS | ns.web4u.cz | ||||||
| A | 2001:1568:fd::241🇨🇿 WEB4U2001:1568::/33 | ||||||
| PTR | ns.web4u.cz | ||||||
| A | 185.14.224.241🇨🇿 WEB4U185.14.224.0/23 | ||||||
| PTR | ns.web4u.cz | ||||||
| MX | mx1.mailchannels.net ⭐ | ||||||
| A | 18.236.29.166🇺🇸 Amazon18.236.0.0/15 EC2 PDX prefix | ||||||
| PTR | ec2-18-236-29-166.us-west-2.compute.amazonaws.com | ||||||
| MX | mx2.mailchannels.net ⭐ | ||||||
| A | 18.236.29.166🇺🇸 Amazon18.236.0.0/15 EC2 PDX prefix | ||||||
| PTR | ec2-18-236-29-166.us-west-2.compute.amazonaws.com | ||||||
| SOA | ns.web4u.czadmin@web4u.cz 2025-05-04 #0 | ||||||
com
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a.gtld-servers.net ⭐ | ||||||
| NS | b.gtld-servers.net | ||||||
| NS | c.gtld-servers.net | ||||||
| NS | d.gtld-servers.net | ||||||
| NS | e.gtld-servers.net | ||||||
| NS | f.gtld-servers.net | ||||||
| NS | g.gtld-servers.net | ||||||
| NS | h.gtld-servers.net | ||||||
| NS | i.gtld-servers.net | ||||||
| NS | j.gtld-servers.net | ||||||
| NS | k.gtld-servers.net | ||||||
| NS | l.gtld-servers.net | ||||||
| NS | m.gtld-servers.net | ||||||
| SOA | a.gtld-servers.netnstld@verisign-grs.com serial=1774409337 | ||||||
Subdomains
mail.certuvmlyn.com |
Same first word
certuvmlyn.com |
DNS History
7 records (6 active, 1 former)
○MXmail.certuvmlyn.com2016-04-27 → 2017-01-10 · 4 obs
● 2017-01-10 09:08:04
○ 2026-03-15 07:00:18
○ 2026-03-25 03:34:24
●MXmx1.mailchannels.net2026-03-15 → 2026-03-25 · 3 obs
● 2026-03-15 07:00:18
● 2026-03-25 03:34:24
●MXmx2.mailchannels.net2026-03-15 → 2026-03-25 · 3 obs
● 2026-03-15 07:00:18
● 2026-03-25 03:34:24
●A2001:1568::132016-04-27 → 2026-03-25 · 2 obs
● 2026-03-25 03:34:24
●A81.91.86.132016-04-27 → 2026-03-25 · 2 obs
● 2026-03-25 03:34:24
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | l.gtld-servers.net, d.gtld-servers.net, k.gtld-servers.net, h.gtld-servers.net... | - |
| certuvmlyn.com | ns.web4u.cz, ns2.web4u.cz | - |
✅ Authoritative Response
Server:185.14.224.241
NS records: ns.web4u.cz, ns2.web4u.cz
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for certuvmlyn.com (unsigned zone)
⏱️ Timing
Total: 813ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 81.91.86.13 |
| AAAA | 1 | 2001:1568::13 |
| NS | 2 | ns.web4u.cz, ns2.web4u.cz |
| MX | 2 | mx1.mailchannels.net (pri: 10), mx2.mailchannels.net (pri: 10) |
| SOA | 1 | ns.web4u.cz admin.web4u.cz |
Analysis
Hierarchy
The parent of mail.certuvmlyn.com is certuvmlyn.com.
IP Addresses
certuvmlyn.com points to two IP numbers: 2001:1568::13 and 81.91.86.13.
Other host names such as bikesafebox.cz, energoforest.com, idbios.com, syncros.cz and levnykubik.cz share IPs with certuvmlyn.com.
Name Servers
Two name servers ns2.web4u.cz and ns.web4u.cz handle the delegation for certuvmlyn.com.
certuvmlyn.com shares the same name server setup as other domains, for example p-atelier.cz, barbie-obchod.cz, wolfsden.cz, drevocentrum-as.cz and starhova.cz.
Host names with two IP numbers:
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.
Mail Servers
Two mail servers handle certuvmlyn.com: mx1.mailchannels.net and mx2.mailchannels.net.
certuvmlyn.com shares the same mail server setup as other domains, including hreha.net, glasswrap.com, fancruft.org, intlmag.org and mail.kyoeiprecision.com.
certuvmlyn.com shares at least some mail servers with other domains, for instance norgren.nu, medecapharma.com and josephbmurphy.com.
Host names with a single IP:
mx1.mailchannels.net points to 18.236.29.166.
mx2.mailchannels.net points to 18.236.29.166.
Host names pointing to 18.236.29.166: mx1.mailchannels.net and mx2.mailchannels.net.