root.cern - dns.ninja

`root.cern`

DNSSEC	⚠️ Not signed
A	2001:1458:201:8b::100:23b^{🇨🇭 CERN2001:1458::/32 European Organization for Nuclear Research}
		PTR	`lbaas-630cc22c-65d0-4b63-90ae-ea57b4b05b81.cern.ch`
A	137.138.6.72^{🇨🇭 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.ch`external-dns@cern.ch 2025-03-25 #1

`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.cern`hostmaster@donuts.email serial=1781699222

rank #171227 globally
rank #3 in the tld
📈 Tranco rank: #379,171

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otro.kr

troo.es

toor.me

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toro.construction

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orto.de

orto.co.uk

DNS History

9 records (4 active, 5 former)

●NSext-dns-1.cern.ch2017-05-29 → 2026-06-17 · 2 obs

● 2017-05-29 00:02:16
● 2026-06-17 12:35:24

●NSext-dns-2.cern.ch2017-05-29 → 2026-06-17 · 2 obs

● 2017-05-29 00:02:16
● 2026-06-17 12:35:24

○MXcernmxgwlb.cern.ch2017-05-29 → 2020-12-05 · 4 obs

● 2017-05-29 00:02:16
● 2020-12-05 06:58:14
○ 2026-03-02 02:04:54
○ 2026-06-17 12:35:24

○A137.138.13.1432017-05-29 → 2017-05-29 · 3 obs

● 2017-05-29 00:02:16
○ 2020-11-29 21:33:32
○ 2026-06-17 12:35:24

○A137.138.18.2362020-11-29 → 2020-12-05 · 5 obs

○ 2017-05-29 00:02:16
● 2020-11-29 21:33:32
● 2020-12-05 06:58:14
○ 2026-03-02 02:04:54
○ 2026-06-17 12:35:24

●A137.138.6.722026-03-02 → 2026-06-17 · 3 obs

○ 2020-12-05 06:58:14
● 2026-03-02 02:04:54
● 2026-06-17 12:35:24

○A2001:1458:201:45::100:b2017-05-29 → 2017-05-29 · 3 obs

● 2017-05-29 00:02:16
○ 2020-11-29 21:33:32
○ 2026-06-17 12:35:24

●A2001:1458:201:8b::100:23b2026-03-02 → 2026-06-17 · 3 obs

○ 2020-12-05 06:58:14
● 2026-03-02 02:04:54
● 2026-06-17 12:35:24

○A2001:1458:201:ee::100:62020-11-29 → 2020-12-05 · 5 obs

○ 2017-05-29 00:02:16
● 2020-11-29 21:33:32
● 2020-12-05 06:58:14
○ 2026-03-02 02:04:54
○ 2026-06-17 12:35:24

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
cern	a0.nic.cern, a2.nic.cern, b0.nic.cern, c0.nic.cern	8 records
root.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 root.cern (unsigned zone)

⏱️ Timing

Total: 1375ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`137.138.6.72`
AAAA	1	`2001:1458:201:8b::100:23b`
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 (a0.nic.cern, a0.nic.cern, a2.nic.cern...)

Analysis

IP Addresses

root.cern directs to two IP numbers, 137.138.6.72 and 2001:1458:201:8b::100:23b

The host names webeos-apps-lb-1.cern.ch, www.nic.cern, nic.cern and lbaas-630cc22c-65d0-4b63-90ae-ea57b4b05b81.cern.ch all share IP numbers with root.cern.

Name Servers

DNS delegation for root.cern points to two name servers: ext-dns-1.cern.ch and ext-dns-2.cern.ch.

root.cern shares its NS records with other domains, for example isolde.cern, docs.cern.ch, paas-apps-shard-1.cern.ch and two others.

root.cern shares at least some of its name servers with other domains, including 68.70.192.in-addr.arpa, european-light-source.eu, cc.in2p3.fr and two others.

These name servers are frequently seen alongside scsnms.switch.ch, ip-cahcp-1.cern.ch, ip-cahcp-2.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.