opensource.cern - robtex.com
opensource.cern
| DNSSEC | ⚠️ Not signed | ||||||
| A | 2001:1458:201:4::100:324🇨🇭 AS5132001:1458::/32 | ||||||
| PTR | lbaas-6f35e927-bae9-4215-978e-2451b7af9954.cern.ch | ||||||
| A | 137.138.226.190🇨🇭 AS513137.138.0.0/16 | ||||||
| NS | ext-dns-1.cern.ch ⭐ | ||||||
| A | 2001:1458:1:1::5AS5132001:1458::/32 | ||||||
| A | 192.65.187.5 | ||||||
| NS | ext-dns-2.cern.ch | ||||||
| A | 2001:1458:1:2::100:85AS5132001:1458::/32 | ||||||
| A | 192.91.245.85 | ||||||
| MX | opensource-cern.mail.protection.outlook.com ⭐ | ||||||
| TXT | v=DMARC1; p=quarantine; sp=none; pct=100; rua=mailto:dmarc.rua@cern.ch; ruf=m... | ||||||
| TXT | MS=ms34046962 | ||||||
| TXT | v=spf1 include:spf.cern.ch -all | ||||||
| SOA | ext-dns-1.cern.chexternal-dns@cern.ch 2026-09-11 #4 | ||||||
cern
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a0.nic.cern ⭐ | ||||||
| NS | a2.nic.cern | ||||||
| NS | b0.nic.cern | ||||||
| NS | c0.nic.cern | ||||||
| SOA | a0.nic.cernhostmaster@donuts.email serial=1794437023 | ||||||
Same first word
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DNS History
5 records (5 active, 0 former)
●NSext-dns-1.cern.ch2026-10-17 → 2026-11-11 · 2 obs
● 2026-11-11 22:46:14
●NSext-dns-2.cern.ch2026-10-17 → 2026-11-11 · 2 obs
● 2026-11-11 22:46:14
●MXopensource-cern.mail.protection.outlook.com2026-10-17 → 2026-11-11 · 2 obs
● 2026-11-11 22:46:14
●A137.138.226.1902026-10-17 → 2026-11-11 · 2 obs
● 2026-11-11 22:46:14
●A2001:1458:201:4::100:3242026-10-17 → 2026-11-11 · 2 obs
● 2026-11-11 22:46:14
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cern | a0.nic.cern, a2.nic.cern, b0.nic.cern, c0.nic.cern | 8 records |
| opensource.cern | ext-dns-1.cern.ch, ext-dns-2.cern.ch | - |
✅ Authoritative Response
Server:192.65.187.5
NS records: ext-dns-1.cern.ch, ext-dns-2.cern.ch
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for opensource.cern (unsigned zone)
⏱️ Timing
Total: 1982ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 137.138.226.190 |
| AAAA | 1 | 2001:1458:201:4::100:324 |
| NS | 2 | ext-dns-2.cern.ch, ext-dns-1.cern.ch |
| MX | 1 | opensource-cern.mail.protection.outlook. |
| TXT | 3 | v=spf1 include:spf.cern.ch -all, MS=ms34046962... |
| SOA | 1 | ext-dns-1.cern.ch external-dns.cern.ch |
📌 Glue Records Collected
Total: 8
In-bailiwick: 8 (a0.nic.cern, a0.nic.cern, a2.nic.cern...)
Analysis
IP Addresses
opensource.cern resolves to the IP addresses 137.138.226.190 and 2001:1458:201:4::100:324
lbaas-6f35e927-bae9-4215-978e-2451b7af9954.cern.ch, giving.cern, itt.cern and two other host names share IP numbers with opensource.cern.
Name Servers
DNS delegation for opensource.cern points to two name servers: ext-dns-1.cern.ch and ext-dns-2.cern.ch.
opensource.cern uses the same name servers as several other domains — among them cernvm.cern, engineering.cern, computing.cern and two more.
opensource.cern shares at least some of its name servers with other domains, including 173.12.194.in-addr.arpa, 175.12.194.in-addr.arpa, 187.12.194.in-addr.arpa and two others.
These name servers are frequently seen alongside scsnms.switch.ch, ip-cahcp-2.cern.ch, ip-cahcp-1.cern.ch and 7 other name servers.
ext-dns-1.cern.ch directs to 192.65.187.5 and 2001:1458:1:1::5. ext-dns-2.cern.ch directs to 192.91.245.85 and 2001:1458:1:2::100:85. Each host name carries two IP addresses.
Mail Servers
Mail for opensource.cern is handled by a single mail server, opensource-cern.mail.protection.outlook.com.