gtt.cz - robtex.com
gtt.cz
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| A | 2a00:4b40:aaaa:2011::7🇸🇰 WEBSUPPORT-SRO-SK-AS2a00:4b40::/32 | ||||||
| A | 37.9.175.211🇸🇰 WEBSUPPORT-SRO-SK-AS37.9.175.0/24 | ||||||
| NS | ns1.websupport.cz ⭐ | ||||||
| A | 2a10:bbc0::11🇨🇿 ACTIVE24-AS2a10:bbc0::/32 | ||||||
| PTR | ns1.websupport.eu | ||||||
| A | 45.10.97.11🇨🇿 ACTIVE24-AS45.10.97.0/24 | ||||||
| PTR | ns1.websupport.eu | ||||||
| NS | ns2.websupport.cz | ||||||
| A | 2a02:250:3::12🇸🇪 ACTIVE24-AS2a02:250:3::/48 | ||||||
| PTR | ns2.websupport.eu | ||||||
| A | 185.71.159.12🇸🇪 ACTIVE24-AS185.71.159.0/24 | ||||||
| PTR | ns2.websupport.eu | ||||||
| NS | ns3.websupport.eu | ||||||
| A | 2a10:bbc0::13🇨🇿 ACTIVE24-AS2a10:bbc0::/32 | ||||||
| PTR | ns3.websupport.eu | ||||||
| A | 45.10.97.13🇨🇿 ACTIVE24-AS45.10.97.0/24 | ||||||
| PTR | ns3.websupport.eu | ||||||
| MX | mailin1.gtt.cz ⭐ | ||||||
| A | 2a00:4b40:aaaa:2101:45:13:137:105🇸🇰 WEBSUPPORT-SRO-SK-AS2a00:4b40::/32 | ||||||
| A | 45.13.137.113🇸🇰 WEBSUPPORT-SRO-SK-AS45.13.137.0/24 | ||||||
| PTR | m1-u6-mx.websupport.hu | ||||||
| MX | mailin2.gtt.cz(100) | ||||||
| A | 2a00:4b40:aaaa:2101:45:13:137:114🇸🇰 WEBSUPPORT-SRO-SK-AS2a00:4b40::/32 | ||||||
| PTR | mx20.websupport.hu | ||||||
| A | 45.13.137.103🇸🇰 WEBSUPPORT-SRO-SK-AS45.13.137.0/24 | ||||||
| PTR | m1-u5-mx.websupport.cz | ||||||
| SOA | ns1.websupport.czadmin@websupport.cz serial=1751149628 | ||||||
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=1784063840 | ||||||
Subdomains
Same first word
Similar names
DNS History
18 records (7 active, 11 former)
○NSalfa.ns.active24.cz2015-08-14 → 2017-09-04 · 5 obs
● 2015-08-14 18:45:26
● 2017-09-04 17:28:50
○ 2026-04-22 21:38:02
○ 2026-07-14 22:00:54
○NSbeta.ns.active24.cz2015-08-14 → 2017-09-04 · 5 obs
● 2015-08-14 18:45:26
● 2017-09-04 17:28:50
○ 2026-04-22 21:38:02
○ 2026-07-14 22:00:54
○NSgama.ns.active24.sk2015-08-14 → 2017-09-04 · 5 obs
● 2015-08-14 18:45:26
● 2017-09-04 17:28:50
○ 2026-04-22 21:38:02
○ 2026-07-14 22:00:54
○NSns.dns4.cz2008-12-29 → 2017-09-04 · 4 obs
● 2017-09-04 17:28:50
○ 2026-04-22 21:38:02
○ 2026-07-14 22:00:54
○NSns.dns4.net2008-12-29 → 2008-12-29 · 3 obs
○ 2015-08-14 18:45:26
○ 2026-07-14 22:00:54
●NSns1.websupport.cz2026-04-22 → 2026-07-14 · 3 obs
● 2026-04-22 21:38:02
● 2026-07-14 22:00:54
●NSns2.websupport.cz2026-04-22 → 2026-07-14 · 3 obs
● 2026-04-22 21:38:02
● 2026-07-14 22:00:54
●NSns3.websupport.eu2026-04-22 → 2026-07-14 · 3 obs
● 2026-04-22 21:38:02
● 2026-07-14 22:00:54
○MXin.smtp.cz2008-12-29 → 2016-10-11 · 4 obs
● 2016-10-11 18:41:12
○ 2017-07-10 01:31:54
○ 2026-07-14 22:00:54
●MXmailin1.gtt.cz2026-04-22 → 2026-07-14 · 3 obs
● 2026-04-22 21:38:02
● 2026-07-14 22:00:54
●MXmailin2.gtt.cz2026-04-22 → 2026-07-14 · 3 obs
● 2026-04-22 21:38:02
● 2026-07-14 22:00:54
○MXmx.smtp.cz2008-12-29 → 2016-10-11 · 4 obs
● 2016-10-11 18:41:12
○ 2017-07-10 01:31:54
○ 2026-07-14 22:00:54
○MXmx1.active24.com2017-07-10 → 2017-09-04 · 5 obs
● 2017-07-10 01:31:54
● 2017-09-04 17:28:50
○ 2026-04-22 21:38:02
○ 2026-07-14 22:00:54
○MXmx2.active24.com2017-07-10 → 2017-09-04 · 5 obs
● 2017-07-10 01:31:54
● 2017-09-04 17:28:50
○ 2026-04-22 21:38:02
○ 2026-07-14 22:00:54
●A2a00:4b40:aaaa:2011::72026-04-22 → 2026-07-14 · 3 obs
● 2026-04-22 21:38:02
● 2026-07-14 22:00:54
○A2a02:4a8:ac24:102::96:942015-08-14 → 2017-09-04 · 5 obs
● 2015-08-14 18:45:26
● 2017-09-04 17:28:50
○ 2026-04-22 21:38:02
○ 2026-07-14 22:00:54
●A37.9.175.2112026-04-22 → 2026-07-14 · 3 obs
● 2026-04-22 21:38:02
● 2026-07-14 22:00:54
○A81.95.96.942008-12-29 → 2017-09-04 · 4 obs
● 2017-09-04 17:28:50
○ 2026-04-22 21:38:02
○ 2026-07-14 22:00:54
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | a.ns.nic.cz, b.ns.nic.cz, c.ns.nic.cz, d.ns.nic.cz | - |
| gtt.cz | ns1.websupport.cz, ns2.websupport.cz, ns3.websupport.eu | - |
✅ Authoritative Response
Server:185.71.159.12
NS records: ns1.websupport.cz, ns2.websupport.cz, ns3.websupport.eu
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 1661ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 37.9.175.211 |
| AAAA | 1 | 2a00:4b40:aaaa:2011::7 |
| NS | 3 | ns1.websupport.cz, ns2.websupport.cz... |
| MX | 2 | mailin1.gtt.cz (pri: 10), mailin2.gtt.cz (pri: 100) |
| SOA | 1 | ns1.websupport.cz admin.websupport.cz |
Analysis
Hierarchy
mailin2.gtt.cz and mailin1.gtt.cz each fall under gtt.cz as their parent domain.
IP Addresses
gtt.cz has two IP addresses: 37.9.175.211 and 2a00:4b40:aaaa:2011::7
Two other host names, along with stavivamares.cz, wouterse.net and pestovat.cz, also share IP numbers with gtt.cz.
Name Servers
Three name servers are authoritative for gtt.cz: ns1.websupport.cz, ns2.websupport.cz and ns3.websupport.eu.
At least some of gtt.cz's name servers are shared with other domains, for example kulbach-elz.de, navacom.cz, galvanko.cz and two more.
It is common for these name servers to be used in conjunction with the name servers ns1.websupport.sk, ns2.websupport.sk and ns3.websupport.sk.
ns1.websupport.cz resolves to 45.10.97.11 and 2a10:bbc0::11. ns2.websupport.cz resolves to 185.71.159.12 and 2a02:250:3::12. ns3.websupport.eu resolves to 45.10.97.13 and 2a10:bbc0::13. All three hostnames point to two IP numbers each.
Mail Servers
gtt.cz is served by two mail servers, mailin1.gtt.cz and mailin2.gtt.cz.
Each of the two host names carries two IP addresses: mailin1.gtt.cz points to 45.13.137.113 and 2a00:4b40:aaaa:2101:45:13:137:105, and mailin2.gtt.cz points to 45.13.137.103 and 2a00:4b40:aaaa:2101:45:13:137:114.