knowledge.cern - robtex.com
knowledge.cern
| DNSSEC | ⚠️ Not signed | ||||||
| A | 2001:1458:201:8b::100:1c8🇨🇭 CERN2001:1458::/32 European Organization for Nuclear Research | ||||||
| PTR | lbaas-ed6043ec-be11-40f8-b8b7-ec7cedb5fdd9.cern.ch | ||||||
| A | 137.138.6.31🇨🇭 CERN137.138.0.0/16 -LAN1 | ||||||
| NS | ext-dns-1.cern.ch ⭐ | ||||||
| A | 2001:1458:1:1::5🇨🇭 CERN2001:1458::/32 European Organization for Nuclear Research | ||||||
| PTR | ext-dns-1.cern.ch | ||||||
| A | 192.65.187.5🇨🇭 CERN192.65.184.0/21 -BLK2 | ||||||
| PTR | ext-dns-1.cern.ch | ||||||
| NS | ext-dns-2.cern.ch | ||||||
| A | 2001:1458:1:2::100:85🇨🇭 CERN2001:1458::/32 European Organization for Nuclear Research | ||||||
| PTR | ext-dns-2.cern.ch | ||||||
| A | 192.91.245.85🇨🇭 CERN192.91.244.0/23 - European Laboratory for Particle Physics CH-1211 Geneva 23, Switzerland | ||||||
| PTR | ext-dns-2.cern.ch | ||||||
| SOA | ext-dns-1.cern.chexternal-dns@cern.ch 2019-05-20 #2 | ||||||
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=1794431941 | ||||||
Same first word
Similar names
Previous names
experiments.cern |
fcc.cern |
flair.cern |
fluka.cern |
giving.cern |
go.cern |
hiddenparticles.cern |
higgsboson.cern |
home.cern |
hse.cern |
ideasquare.cern |
incident.cern |
internationalrelations.cern |
isolde.cern |
itt.cern |
jobs.cern |
Next names
DNS History
4 records (4 active, 0 former)
●NSext-dns-1.cern.ch2026-11-10 → 2026-11-11 · 2 obs
● 2026-11-11 21:23:36
●NSext-dns-2.cern.ch2026-11-10 → 2026-11-11 · 2 obs
● 2026-11-11 21:23:36
●A137.138.6.312026-11-10 → 2026-11-11 · 2 obs
● 2026-11-11 21:23:36
●A2001:1458:201:8b::100:1c82026-11-10 → 2026-11-11 · 2 obs
● 2026-11-11 21:23:36
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cern | a2.nic.cern, b0.nic.cern, c0.nic.cern, a0.nic.cern | 8 records |
| knowledge.cern | ext-dns-2.cern.ch, ext-dns-1.cern.ch | - |
✅ Authoritative Response
Server:192.91.245.85
NS records: ext-dns-2.cern.ch, ext-dns-1.cern.ch
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for knowledge.cern (unsigned zone)
⏱️ Timing
Total: 798ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 137.138.6.31 |
| AAAA | 1 | 2001:1458:201:8b::100:1c8 |
| NS | 2 | ext-dns-2.cern.ch, ext-dns-1.cern.ch |
| SOA | 1 | ext-dns-1.cern.ch external-dns.cern.ch |
📌 Glue Records Collected
Total: 8
In-bailiwick: 8 (c0.nic.cern, b0.nic.cern, a2.nic.cern...)
Analysis
IP Addresses
knowledge.cern has two IP addresses: 137.138.6.31 and 2001:1458:201:8b::100:1c8
Additional host names — biodynamo.org, scientific-info.cern, isseg.eu and two others — share IP numbers with knowledge.cern.
Name Servers
knowledge.cern uses two name servers for its delegation: ext-dns-1.cern.ch and ext-dns-2.cern.ch.
knowledge.cern shares its name server setup with other domains, including db-lb-139.cern.ch, db-lb-185.cern.ch, flair.cern and two others.
At least some of knowledge.cern's name servers are shared with other domains, for example 190.12.194.in-addr.arpa, 149.12.194.in-addr.arpa, 4.2.0.3.0.6.6.0.1.0.0.2.ip6.arpa and two more.
These name servers tend to co-occur with scsnms.switch.ch, ip-cahcp-1.cern.ch, ip-cahcp-2.cern.ch and 7 other name servers in the same DNS delegations.
The two host names ext-dns-1.cern.ch and ext-dns-2.cern.ch each have a pair of IP addresses: ext-dns-1.cern.ch has 192.65.187.5 and 2001:1458:1:1::5, and ext-dns-2.cern.ch has 192.91.245.85 and 2001:1458:1:2::100:85.