open-system.pl - robtex.com
open-system.pl
| DNSSEC | ⚠️ Not signed | ||||||
| A | 136.243.254.121🇩🇪 Hetzner136.243.0.0/16 HETZNER-RZ-BLK-ERX3 | ||||||
| PTR | s602.calserver.eu | ||||||
| NS | ns1.cal.pl ⭐ | ||||||
| A | 45.138.106.10🇨🇿 WEDOS-GLOBAL45.138.106.0/24 WEDOS Global | ||||||
| PTR | ns1.cal.pl | ||||||
| NS | ns2.cal.pl | ||||||
| A | 185.8.238.10🇨🇿 WEDOS-GLOBAL185.8.238.0/24 WEDOS Global | ||||||
| PTR | ns2.cal.pl | ||||||
| MX | mail.open-system.pl ⭐ | ||||||
| A | 136.243.254.121🇩🇪 Hetzner136.243.0.0/16 HETZNER-RZ-BLK-ERX3 | ||||||
| PTR | s602.calserver.eu | ||||||
| TXT | v=spf1 a mx ip4:167.235.187.71 include:_spf.cal.pl -all | ||||||
| SOA | ns1.cal.plhostmaster@open-system.pl 2026-03-15 #2 | ||||||
pl
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a-dns.pl ⭐ | ||||||
| NS | b-dns.pl | ||||||
| NS | d-dns.pl | ||||||
| NS | f-dns.pl | ||||||
| NS | h-dns.pl | ||||||
| NS | j-dns.pl | ||||||
| TXT | ccTLD of Poland | ||||||
| SOA | a-dns.pldnsmaster@nask.pl serial=1775975472 | ||||||
Previously MX for
open-system.pl |
Subdomains
mail.open-system.pl |
Same first word
open-system.fr |
open-system.pl |
open-system.org |
DNS History
9 records (4 active, 5 former)
●NSns1.cal.pl2026-02-15 → 2026-04-12 · 3 obs
● 2026-02-15 22:30:48
● 2026-04-12 10:06:02
○NSns1.nazwa.pl2018-05-17 → 2018-05-17 · 3 obs
○ 2026-02-15 22:30:48
○ 2026-04-12 10:06:02
●NSns2.cal.pl2026-02-15 → 2026-04-12 · 3 obs
● 2026-02-15 22:30:48
● 2026-04-12 10:06:02
○NSns2.nazwa.pl2018-05-17 → 2018-05-17 · 3 obs
○ 2026-02-15 22:30:48
○ 2026-04-12 10:06:02
○NSns3.nazwa.pl2018-05-17 → 2018-05-17 · 3 obs
○ 2026-02-15 22:30:48
○ 2026-04-12 10:06:02
●MXmail.open-system.pl2026-02-15 → 2026-04-12 · 3 obs
● 2026-02-15 22:30:48
● 2026-04-12 10:06:02
○MXopen-system.pl2018-05-17 → 2018-05-17 · 3 obs
○ 2026-02-15 22:30:48
○ 2026-04-12 10:06:02
●A136.243.254.1212026-02-15 → 2026-04-12 · 3 obs
● 2026-02-15 22:30:48
● 2026-04-12 10:06:02
○A85.128.202.422018-05-17 → 2018-05-17 · 3 obs
○ 2026-02-15 22:30:48
○ 2026-04-12 10:06:02
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| pl | a-dns.pl, b-dns.pl, d-dns.pl, f-dns.pl... | - |
| open-system.pl | ns1.cal.pl, ns2.cal.pl | 2 records |
✅ Authoritative Response
Server:45.138.106.10
NS records: ns1.cal.pl, ns2.cal.pl
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for open-system.pl (unsigned zone)
⏱️ Timing
Total: 764ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 136.243.254.121 |
| NS | 2 | ns2.cal.pl, ns1.cal.pl |
| MX | 1 | mail.open-system.pl (pri: 10) |
| TXT | 1 | v=spf1 a mx ip4:167.235.187.71 include:_ |
| SOA | 1 | ns1.cal.pl hostmaster.open-system.pl |
📌 Glue Records Collected
Total: 2
Out-of-bailiwick: 2 (ns1.cal.pl, ns2.cal.pl)
Analysis
Hierarchy
The parent of mail.open-system.pl is open-system.pl.
IP Addresses
open-system.pl points to an IP address: 136.243.254.121.
other host names include 327.pl, mail.mant.pl, mail.medhouse.pl, mail.woronin.eu and mant.pl; they share IP numbers with open-system.pl.
Name Servers
Two name servers ns1.cal.pl and ns2.cal.pl handle the delegation for open-system.pl.
open-system.pl shares the same name server setup as other domains, for instance globalgrupa.com, ex-clusive.pl, ccrch.com, malymb.cal.pl and moden.pl.
open-system.pl shares name servers with other domains at least partially, for instance noveco.com.pl, mwgastro.pl, sklepthu.cal24.pl and oriniok.pl.
Host names with one IP:
ns1.cal.pl points to: 45.138.106.10
ns2.cal.pl points to: 185.8.238.10
Mail Servers
open-system.pl is handled by a single mail server, mail.open-system.pl.
The host name mail.open-system.pl points to IP 136.243.254.121.