4students.cz - robtex.com
4students.cz
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| A | 185.102.21.248🇨🇿 ONE-NETWORK185.102.21.0/24 | ||||||
| PTR | dw311.endora.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 | ||||||
| MX | mxavas.forpsi.com ⭐ | ||||||
| A | 81.2.195.200🇨🇿 INTERNET-CZ81.2.192.0/18 INTERNET CZ, a.s. | ||||||
| PTR | mxavas.forpsi.com | ||||||
| SOA | ns.forpsi.netadmin@forpsi.com 2026-03-24 #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=1774799234 | ||||||
rank #964 in the tld
📈 Tranco rank: #917,891
Same first word
Similar names
DNS History
6 records (5 active, 1 former)
●NSns.forpsi.net2015-06-09 → 2026-03-29 · 2 obs
● 2026-03-29 16:05:06
●MXmxavas.forpsi.com2015-06-09 → 2026-03-29 · 2 obs
● 2026-03-29 16:05:06
●A185.102.21.2482026-03-18 → 2026-03-29 · 3 obs
● 2026-03-18 06:53:10
● 2026-03-29 16:05:06
○A88.86.121.242015-06-09 → 2016-09-23 · 4 obs
● 2016-09-23 19:53:00
○ 2026-03-18 06:53:10
○ 2026-03-29 16:05:06
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cz | c.ns.nic.cz, a.ns.nic.cz, b.ns.nic.cz, d.ns.nic.cz | - |
| 4students.cz | ns.forpsi.cz, ns.forpsi.it, ns.forpsi.net | 2 records |
✅ Authoritative Response
Server:81.2.209.185
NS records: ns.forpsi.cz, ns.forpsi.it, ns.forpsi.net
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 934ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 185.102.21.248 |
| NS | 3 | ns.forpsi.cz, ns.forpsi.it... |
| MX | 1 | mxavas.forpsi.com (pri: 10) |
| 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
4students.cz maps to IP address 185.102.21.248.
Other host names, for instance jirimlcoch.cz, sedl.cz, vymeniky.cz, vyrobkyprostavbu.cz and vinarstvi1838.cz share IP numbers with 4students.cz.
Name Servers
4students.cz is delegated to name servers ns.forpsi.cz, ns.forpsi.it and ns.forpsi.net.
4students.cz at least partially shares name servers with other domains such as i-cars.cz, hotelpanoramaprag.cz, snizek.cz, hogosoft.eu and artwork.cz.
these name servers are commonly used with the name servers ns.forpsi.us.
Host names with two IP numbers:
ns.forpsi.cz points to 2001:15e8:201:1::d1b9 and 81.2.209.185.
ns.forpsi.it points to 2a00:6d41:2:1::5 and 95.110.254.165.
ns.forpsi.net points to 2001:15e8:101:1::c282 and 81.2.194.130.
Mail Servers
4students.cz is handled by a single mail server, mxavas.forpsi.com.
4students.cz shares the same mail server setup as other domains, including luxtel.pl, prozivot.info, aurea.cz, bytyzdarma.cz and argimex.cz.
4students.cz shares mail servers with other domains at least in part, for instance bossami.cz, dabricon.com, educo.cz, luconet.cz and tritonrestaurant.cz.
mxavas.forpsi.com points to one IP number: 81.2.195.200.