knowbe4.cz - robtex.com
knowbe4.cz
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| A | 81.2.196.170🇨🇿 INTERNET-CZ81.2.192.0/18 INTERNET CZ, a.s. | ||||||
| PTR | admin.grhosting.cz | ||||||
| NS | ns.forpsi.net ⭐ | ||||||
| A | 2001:15e8:101:1::c282🇨🇿 INTERNET-CZ2001:15e8::/32 | ||||||
| PTR | ns.forpsi.net | ||||||
| A | 81.2.194.130🇨🇿 INTERNET-CZ81.2.192.0/18 INTERNET CZ, a.s. | ||||||
| PTR | ns.forpsi.net | ||||||
| NS | ns.forpsi.cz | ||||||
| A | 2001:15e8:201:1::d1b9🇨🇿 INTERNET-CZ2001:15e8::/32 | ||||||
| PTR | ns.forpsi.cz | ||||||
| A | 81.2.209.185🇨🇿 INTERNET-CZ81.2.209.0/24 | ||||||
| PTR | ns.forpsi.cz | ||||||
| NS | ns.forpsi.it | ||||||
| A | 2a00:6d41:2:1::5🇮🇹 ARUBA-ASN2a00:6d41::/32 Aruba S.p.A. IPv6 Network | ||||||
| PTR | ns.forpsi.it | ||||||
| A | 95.110.254.165🇮🇹 ARUBA-ASN95.110.192.0/18 Aruba S.p.A. Network | ||||||
| PTR | host165-254-110-95.serverdedicati.aruba.it | ||||||
| SOA | ns.forpsi.netadmin@forpsi.com 2026-07-27 #1 | ||||||
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=1785849440 | ||||||
Same first word
Similar names
DNS History
4 records (4 active, 0 former)
●NSns.forpsi.net2026-06-10 → 2026-08-04 · 2 obs
● 2026-08-04 14:10:58
●A81.2.196.1702026-06-10 → 2026-08-04 · 2 obs
● 2026-08-04 14:10:58
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | b.ns.nic.cz, d.ns.nic.cz, a.ns.nic.cz, c.ns.nic.cz | - |
| knowbe4.cz | ns.forpsi.it, ns.forpsi.net, ns.forpsi.cz | 2 records |
✅ Authoritative Response
Server:81.2.209.185
NS records: ns.forpsi.it, ns.forpsi.net, ns.forpsi.cz
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 937ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 81.2.196.170 |
| NS | 3 | ns.forpsi.cz, ns.forpsi.it... |
| SOA | 1 | ns.forpsi.net admin.forpsi.com |
📌 Glue Records Collected
Total: 2
Out-of-bailiwick: 2 (ns.forpsi.cz, ns.forpsi.cz)
Analysis
IP Addresses
knowbe4.cz resolves to one IP address: 81.2.196.170.
davidabraham.cz, cuv.cz, carg.io and two other host names share IP numbers with knowbe4.cz.
Name Servers
The authoritative name servers for knowbe4.cz are ns.forpsi.cz, ns.forpsi.it and ns.forpsi.net — three in total.
There is at least partial name server overlap between knowbe4.cz and other domains — zena-paliva.cz, powerboats.cz, sartep.cz and two more among them.
These name servers are routinely deployed together with the name servers ns.forpsi.us.
ns.forpsi.cz, ns.forpsi.it and ns.forpsi.net all resolve to exactly two IP numbers apiece: ns.forpsi.cz → 81.2.209.185 and 2001:15e8:201:1::d1b9; ns.forpsi.it → 95.110.254.165 and 2a00:6d41:2:1::5; ns.forpsi.net → 81.2.194.130 and 2001:15e8:101:1::c282.