learn.cern - dns.ninja
learn.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=1784679570 | ||||||
Same first word
Similar names
DNS History
4 records (4 active, 0 former)
●NSext-dns-1.cern.ch2026-02-15 → 2026-07-22 · 2 obs
● 2026-07-22 00:25:34
●NSext-dns-2.cern.ch2026-02-15 → 2026-07-22 · 2 obs
● 2026-07-22 00:25:34
●A137.138.6.312026-02-15 → 2026-07-22 · 2 obs
● 2026-07-22 00:25:34
●A2001:1458:201:8b::100:1c82026-02-15 → 2026-07-22 · 2 obs
● 2026-07-22 00:25:34
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| cern | b0.nic.cern, a0.nic.cern, c0.nic.cern, a2.nic.cern | 8 records |
| learn.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 learn.cern (unsigned zone)
⏱️ Timing
Total: 2934ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 137.138.6.31 |
| AAAA | 1 | 2001:1458:201:8b::100:1c8 |
| NS | 2 | ext-dns-1.cern.ch, ext-dns-2.cern.ch |
| SOA | 1 | ext-dns-1.cern.ch external-dns.cern.ch |
📌 Glue Records Collected
Total: 8
In-bailiwick: 8 (b0.nic.cern, b0.nic.cern, a0.nic.cern...)
Analysis
IP Addresses
learn.cern resolves to the IP addresses 137.138.6.31 and 2001:1458:201:8b::100:1c8
biodynamo.org, isseg.eu, education.cern and two other host names share IP numbers with learn.cern.
Name Servers
The NS records for learn.cern delegate to ext-dns-1.cern.ch and ext-dns-2.cern.ch.
learn.cern uses the same name servers as several other domains — among them opendays.cern, paas-apps-shard-tn.cern.ch, acceleratingnews.eu and two more.
learn.cern partially shares its NS delegation with several other domains, including 187.12.194.in-addr.arpa, huma-num.fr, e.0.3.5.0.6.6.0.1.0.0.2.ip6.arpa and two others.
In DNS configurations, these name servers often share authority with scsnms.switch.ch, ip-cahcp-1.cern.ch, ip-cahcp-2.cern.ch and 7 other name servers.
ext-dns-1.cern.ch resolves to 192.65.187.5 and 2001:1458:1:1::5. Likewise, ext-dns-2.cern.ch resolves to 192.91.245.85 and 2001:1458:1:2::100:85 — two IP addresses apiece.