summitd.cz - robtex.com
summitd.cz
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| A | 2001:1568::11🇨🇿 WEB4U2001:1568::/33 | ||||||
| PTR | php5.web4u.cz | ||||||
| A | 81.91.86.11🇨🇿 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 | ||||||
| TXT | v=spf1 include:_spf.web4u.cz ~all | ||||||
| SOA | ns.web4u.czadmin@web4u.cz 2025-05-02 #0 | ||||||
cz
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a.ns.nic.cz ⭐ | ||||||
| NS | b.ns.nic.cz | ||||||
| NS | c.ns.nic.cz | ||||||
| NS | d.ns.nic.cz | ||||||
| SOA | a.ns.nic.czhostmaster@nic.cz serial=1774844237 | ||||||
Same first word
DNS History
7 records (6 active, 1 former)
○MXmail.summitd.cz2015-08-18 → 2017-01-01 · 4 obs
● 2017-01-01 23:52:40
○ 2026-02-22 11:07:26
○ 2026-03-30 05:01:36
●MXmx1.mailchannels.net2026-02-22 → 2026-03-30 · 3 obs
● 2026-02-22 11:07:26
● 2026-03-30 05:01:36
●MXmx2.mailchannels.net2026-02-22 → 2026-03-30 · 3 obs
● 2026-02-22 11:07:26
● 2026-03-30 05:01:36
●A2001:1568::112015-08-18 → 2026-03-30 · 2 obs
● 2026-03-30 05:01:36
●A81.91.86.112015-08-18 → 2026-03-30 · 2 obs
● 2026-03-30 05:01:36
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz | - |
| summitd.cz | ns.web4u.cz, ns2.web4u.cz | 4 records |
✅ Authoritative Response
Server:85.207.53.12
NS records: ns.web4u.cz, ns2.web4u.cz
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 940ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 81.91.86.11 |
| AAAA | 1 | 2001:1568::11 |
| NS | 2 | ns.web4u.cz, ns2.web4u.cz |
| MX | 2 | mx1.mailchannels.net (pri: 10), mx2.mailchannels.net (pri: 10) |
| TXT | 1 | v=spf1 include:_spf.web4u.cz ~all |
| SOA | 1 | ns.web4u.cz admin.web4u.cz |
📌 Glue Records Collected
Total: 4
Out-of-bailiwick: 4 (ns2.web4u.cz, ns.web4u.cz, ns2.web4u.cz...)
Analysis
IP Addresses
summitd.cz resolves to two IP numbers: 2001:1568::11 and 81.91.86.11.
Other host names, for instance unassigned-81-91-83-53.web4u.cz, statistika.atas.cz, tarpanfinance.ch, poolstar.cz and unassigned-81-91-90-15.web4u.cz share IP numbers with summitd.cz.
Name Servers
summitd.cz has two name servers: ns2.web4u.cz and ns.web4u.cz.
summitd.cz shares the same name server setup as other domains, for example nalouzi.eu, team4u.cz, pixman.eu, printing3d.cz and extra-jewellery.com.
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
summitd.cz is served by two mail servers: mx1.mailchannels.net and mx2.mailchannels.net.
summitd.cz shares the mail server setup with other domains, for example craftposium.com, yourcreativelife.com, selmaartscenter.com, druckstatt.com and askinvent.com.
summitd.cz shares some mail servers with other domains at least partially, for instance onlinesport.se and sazejme.cz.
Host names with one IP number:
mx1.mailchannels.net points to: 18.236.29.166
mx2.mailchannels.net points to: 18.236.29.166
Names pointing to 18.236.29.166: mx1.mailchannels.net and mx2.mailchannels.net