string.cz - dns.ninja
string.cz
| DNSSEC | ⚠️ Not signed | ||||||
| NS | ns2.sdserver.cz ⭐ ⚠️ Not in zone NS records | ||||||
| A | 212.158.143.16🇨🇿 BlueTone-AS212.158.128.0/19 BlueTone-CRa-CZ First address block | ||||||
| NS | ns.sdserver.cz ⚠️ Not in zone NS records | ||||||
| A | 212.158.143.10🇨🇿 BlueTone-AS212.158.128.0/19 BlueTone-CRa-CZ First address block | ||||||
| NS | ns3.sdserver.cz ⚠️ Not in zone NS records | ||||||
| A | 84.244.96.162🇨🇿 BlueTone-AS84.244.64.0/18 BlueTone-CRa-CZ Third address block | ||||||
| TXT | MS=ms43141353 | ||||||
| SOA | ns.sdserver.czdns-admin@stringdata.cz 2017-10-16 #7 | ||||||
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=1785755839 | ||||||
Same first word
Similar names
DNS History
11 records (3 active, 8 former)
●NSns.sdserver.cz2026-02-14 → 2026-08-03 · 3 obs
● 2026-02-14 20:41:04
● 2026-08-03 12:09:18
○NSns1.sdserver.cz2015-08-16 → 2017-02-19 · 4 obs
● 2017-02-19 00:45:38
○ 2026-02-14 20:41:04
○ 2026-08-03 12:09:18
●NSns2.sdserver.cz2015-08-16 → 2026-08-03 · 2 obs
● 2026-08-03 12:09:18
●NSns3.sdserver.cz2015-08-16 → 2026-08-03 · 2 obs
● 2026-08-03 12:09:18
○NSns4.sdserver.cz2015-08-16 → 2026-06-18 · 9 obs
● 2026-02-14 20:41:04
○ 2026-03-13 17:38:18
● 2026-03-17 16:46:52
● 2026-05-13 06:18:34
○ 2026-05-16 11:56:54
● 2026-06-18 23:31:44
○ 2026-08-03 12:09:16
○ 2026-08-03 12:09:18
○NSsrv1.sdserver.cz2015-08-16 → 2017-02-19 · 4 obs
● 2017-02-19 00:45:38
○ 2026-02-14 20:41:04
○ 2026-08-03 12:09:18
○MXmail2.sdserver.cz2015-08-16 → 2017-02-19 · 4 obs
● 2017-02-19 00:45:38
○ 2026-02-14 20:41:04
○ 2026-08-03 12:09:18
○MXsdmail.sdserver.cz2015-08-16 → 2016-03-27 · 4 obs
● 2016-03-27 22:22:02
○ 2017-02-19 00:45:38
○ 2026-08-03 12:09:18
○MXsdmail2.sdserver.cz2017-02-19 → 2026-05-09 · 7 obs
● 2017-02-19 00:45:38
● 2026-05-06 12:01:50
○ 2026-05-08 01:04:50
● 2026-05-09 16:06:24
○ 2026-07-08 04:10:42
○ 2026-08-03 12:09:18
○A212.158.143.252026-02-14 → 2026-02-14 · 4 obs
● 2026-02-14 20:41:04
○ 2026-08-03 12:09:16
○ 2026-08-03 12:09:18
○A81.0.239.662015-08-16 → 2016-03-27 · 4 obs
● 2016-03-27 22:22:02
○ 2017-02-19 00:45:38
○ 2026-08-03 12:09:18
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | a.ns.nic.cz, c.ns.nic.cz, b.ns.nic.cz, d.ns.nic.cz | - |
| string.cz | ns.sdserver.cz, ns2.sdserver.cz, ns3.sdserver.cz | 3 records |
✅ Authoritative Response
Server:212.158.143.10
NS records: ns.sdserver.cz, ns2.sdserver.cz, ns3.sdserver.cz
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for string.cz (unsigned zone)
⏱️ Timing
Total: 948ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 212.158.143.25 |
| NS | 4 | ns2.sdserver.cz, ns.sdserver.cz... |
| MX | 1 | sdmail2.sdserver.cz (pri: 10) |
| TXT | 1 | MS=ms43141353 |
| SOA | 1 | ns.sdserver.cz dns-admin.stringdata.cz |
📌 Glue Records Collected
Total: 3
Out-of-bailiwick: 3 (ns.sdserver.cz, ns2.sdserver.cz, ns3.sdserver.cz)
Analysis
Name Servers
The authoritative name servers for string.cz are ns2.sdserver.cz, ns3.sdserver.cz and ns.sdserver.cz — three in total.
There is at least partial name server overlap between string.cz and other domains — stringdata.cz, pbox.cz, stringdata.sk and two more among them.
These name servers tend to appear in combination with the name servers ns4.sdserver.cz, ns1.sdserver.cz, ns1.bluetone.cz and ns.bluetone.cz.
The hostnames ns2.sdserver.cz, ns3.sdserver.cz and ns.sdserver.cz each resolve to a single IP: ns2.sdserver.cz → 212.158.143.16, ns3.sdserver.cz → 84.244.96.162, ns.sdserver.cz → 212.158.143.10.