dotnetcrew.com - dns.ninja
dotnetcrew.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 2001:1568::14🇨🇿 WEB4U2001:1568::/33 | ||||||
| PTR | php7.web4u.cz | ||||||
| A | 81.91.86.14🇨🇿 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 | 54.69.1.140🇺🇸 Amazon54.68.0.0/15 EC2 PDX Prefix | ||||||
| PTR | ec2-54-69-1-140.us-west-2.compute.amazonaws.com | ||||||
| MX | mx2.mailchannels.net ⭐ | ||||||
| A | 54.69.1.140🇺🇸 Amazon54.68.0.0/15 EC2 PDX Prefix | ||||||
| PTR | ec2-54-69-1-140.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=1786030839 | ||||||
Subdomains
mail.dotnetcrew.com |
Same first word
dotnetcrew.com |
DNS History
8 records (6 active, 2 former)
●NSns.web4u.cz2026-04-29 → 2026-08-06 · 3 obs
● 2026-04-29 11:44:12
● 2026-08-06 15:56:50
○NSns1.verification-hold.suspended-domain.com2017-03-28 → 2017-03-28 · 3 obs
○ 2026-04-29 11:44:12
○ 2026-08-06 15:56:50
●NSns2.web4u.cz2026-04-29 → 2026-08-06 · 3 obs
● 2026-04-29 11:44:12
● 2026-08-06 15:56:50
●MXmx1.mailchannels.net2026-04-29 → 2026-08-06 · 2 obs
● 2026-08-06 15:56:50
●MXmx2.mailchannels.net2026-04-29 → 2026-08-06 · 2 obs
● 2026-08-06 15:56:50
●A2001:1568::142026-04-29 → 2026-08-06 · 3 obs
● 2026-04-29 11:44:12
● 2026-08-06 15:56:50
○A209.99.17.272017-03-28 → 2017-03-28 · 3 obs
○ 2026-04-29 11:44:12
○ 2026-08-06 15:56:50
●A81.91.86.142026-04-29 → 2026-08-06 · 3 obs
● 2026-04-29 11:44:12
● 2026-08-06 15:56:50
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net... | - |
| dotnetcrew.com | ns.web4u.cz, ns2.web4u.cz | - |
✅ Authoritative Response
Server:85.207.53.12
NS records: ns.web4u.cz, ns2.web4u.cz
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for dotnetcrew.com (unsigned zone)
⏱️ Timing
Total: 902ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 81.91.86.14 |
| AAAA | 1 | 2001:1568::14 |
| 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
dotnetcrew.com is a parent domain of mail.dotnetcrew.com.
IP Addresses
dotnetcrew.com resolves to the IP addresses 81.91.86.14 and 2001:1568::14
Two other host names, along with cutandcolor.cz, vs150.server4u.cz and filateliesova.cz, also share IP numbers with dotnetcrew.com.
Name Servers
Two name servers handle the delegation for dotnetcrew.com: ns2.web4u.cz and ns.web4u.cz.
dotnetcrew.com shares its NS records with other domains, for example elega.cz, klweb.cz, tezamo.info and two others.
ns2.web4u.cz and ns.web4u.cz both carry two IP addresses. The A records for ns2.web4u.cz are 85.207.53.12 and 2a02:a40:100:28ff::12; the A records for ns.web4u.cz are 185.14.224.241 and 2001:1568:fd::241.
Mail Servers
dotnetcrew.com is served by two mail servers, mx1.mailchannels.net and mx2.mailchannels.net.
Among the domains sharing a mail server setup with dotnetcrew.com are isapagani.com, kosgear.com, teresapayne.com and two others.
mx1.mailchannels.net directs to 54.69.1.140, as does mx2.mailchannels.net — both hostnames resolve to that one IP address.
mx1.mailchannels.net along with mx2.mailchannels.net each resolve to 54.69.1.140 IP addresses.