`open-education.ch`

DNSSEC	🔒 Signed (DS record present)
A	2a01:ab20:0:4::28^{🇨🇭 CYON2a01:ab20::/32}
		PTR	`s019.cyon.net`
A	149.126.4.28^{🇨🇭 CYON149.126.0.0/21 cyon GmbH}
NS	`ns1.cyon.ch` ⭐
		A	2a01:ab20:0:185::2^{🇨🇭 CYON2a01:ab20::/32}
		A	185.174.216.2^{🇨🇭 CYON185.174.216.0/22}
			PTR	`ns1.cyon.ch`
NS	`ns2.cyon.ch`
		A	2001:67c:234::2^{🇨🇭 CYON2001:67c:234::/48 cyon GmbH}
		A	91.206.24.2^{🇨🇭 CYON91.206.24.0/23 Cyon GmbH}
			PTR	`ns2.cyon.ch`
MX	`open-education.ch` ⭐ 🔒
		A	2a01:ab20:0:4::28^{🇨🇭 CYON2a01:ab20::/32}
			PTR	`s019.cyon.net`
		A	149.126.4.28^{🇨🇭 CYON149.126.0.0/21 cyon GmbH}
			PTR	`s019.cyon.net`
TXT	`v=spf1 +a +mx +ip4:194.126.200.0/24 +ip4:149.126.0.0/21 -all`
SOA	`ns1.cyon.ch`server@cyon.ch 2021-01-18 #77

`ch`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.nic.ch` ⭐
	NS	`b.nic.ch`
	NS	`d.nic.ch`
	NS	`e.nic.ch`
	NS	`f.nic.ch`
	SOA	`a.nic.ch`dns-operation@switch.ch 2026-04-14 #36

Previously MX for

open-education.ch

Same first word

open-education.net

open-education.fr

open-education.org

open-education.de

open-education.ch

DNS History

13 records (5 active, 8 former)

○NSns.second-ns.com2017-01-09 → 2017-01-09 · 4 obs

○ 2016-02-08 06:46:10
● 2017-01-09 03:18:46
○ 2018-09-25 00:01:26
○ 2026-04-14 16:34:12

●NSns1.cyon.ch2018-09-25 → 2026-04-14 · 3 obs

○ 2017-01-09 03:18:46
● 2018-09-25 00:01:26
● 2026-04-14 16:34:12

○NSns1.your-server.de2017-01-09 → 2017-01-09 · 4 obs

○ 2016-02-08 06:46:10
● 2017-01-09 03:18:46
○ 2018-09-25 00:01:26
○ 2026-04-14 16:34:12

●NSns2.cyon.ch2018-09-25 → 2026-04-14 · 3 obs

○ 2017-01-09 03:18:46
● 2018-09-25 00:01:26
● 2026-04-14 16:34:12

○NSns3.second-ns.de2017-01-09 → 2017-01-09 · 4 obs

○ 2016-02-08 06:46:10
● 2017-01-09 03:18:46
○ 2018-09-25 00:01:26
○ 2026-04-14 16:34:12

○NSns5.nine.ch2015-07-18 → 2015-11-16 · 4 obs

● 2015-07-18 04:59:58
● 2015-11-16 08:19:48
○ 2016-02-08 06:46:10
○ 2026-04-14 16:34:12

○NSns6.nine.ch2015-07-18 → 2015-11-16 · 4 obs

● 2015-07-18 04:59:58
● 2015-11-16 08:19:48
○ 2016-02-08 06:46:10
○ 2026-04-14 16:34:12

○MXmail.open-education.ch2017-01-09 → 2017-01-09 · 3 obs

● 2017-01-09 03:18:46
○ 2018-09-25 00:01:26
○ 2026-04-14 16:34:12

●MXopen-education.ch2018-09-25 → 2026-04-14 · 5 obs

○ 2017-01-09 03:18:46
● 2018-09-25 00:01:26
● 2026-03-15 16:31:32
○ 2026-04-05 22:12:36
● 2026-04-14 16:34:12

●A149.126.4.282018-09-25 → 2026-04-14 · 5 obs

○ 2017-01-09 03:18:46
● 2018-09-25 00:01:26
● 2026-03-15 16:31:32
○ 2026-04-05 22:12:36
● 2026-04-14 16:34:12

●A2a01:ab20:0:4::282026-03-06 → 2026-04-14 · 5 obs

○ 2018-09-25 00:01:26
● 2026-03-06 02:53:10
● 2026-03-15 16:31:32
○ 2026-04-05 22:12:36
● 2026-04-14 16:34:12

○A5.148.171.2312015-07-18 → 2015-11-16 · 4 obs

● 2015-07-18 04:59:58
● 2015-11-16 08:19:48
○ 2016-02-08 06:46:10
○ 2026-04-14 16:34:12

○A78.46.4.1712017-01-09 → 2017-01-09 · 4 obs

○ 2016-02-08 06:46:10
● 2017-01-09 03:18:46
○ 2018-09-25 00:01:26
○ 2026-04-14 16:34:12

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
ch	a.nic.ch, b.nic.ch, d.nic.ch, e.nic.ch...	10 records
open-education.ch	ns2.cyon.ch, ns1.cyon.ch	4 records

✅ Authoritative Response

Server:91.206.24.2

NS records: ns2.cyon.ch, ns1.cyon.ch

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 645ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`149.126.4.28`
AAAA	1	`2a01:ab20:0:4::28`
NS	2	`ns1.cyon.ch, ns2.cyon.ch`
MX	1	`open-education.ch (pri: 0)`
TXT	1	`v=spf1 +a +mx +ip4:194.126.200.0/24 +ip4`
SOA	1	`ns1.cyon.ch server.cyon.ch`

📌 Glue Records Collected

Total: 14

In-bailiwick: 10 (a.nic.ch, a.nic.ch, b.nic.ch...)

Out-of-bailiwick: 4 (ns2.cyon.ch, ns1.cyon.ch, ns2.cyon.ch...)

Analysis

IP Addresses

open-education.ch has two IP numbers: 2a01:ab20:0:4::28 and 149.126.4.28.

Other host names, for instance correo.greenstyling.ch, casafair.ch, mx0.unjl.org, ibchur.ch and ferien-check.ch share IP numbers with open-education.ch.

Name Servers

open-education.ch's delegation uses two name servers: ns1.cyon.ch and ns2.cyon.ch.

open-education.ch uses the same name server setup as other domains, such as rssb.ch, maglab.ch, denitool.ch, nexialis.com and xpsy.ch.

open-education.ch at least partially shares name servers with other domains, for example jhh.ch.

Host names with two IPs:

ns1.cyon.ch points to 2a01:ab20:0:185::2 and 185.174.216.2

ns2.cyon.ch points to 2001:67c:234::2 and 91.206.24.2

Mail Servers

open-education.ch is handled by a single mail server, open-education.ch.

The host name open-education.ch resolves to two IP numbers: 2a01:ab20:0:4::28 and 149.126.4.28.

open-education.ch - robtex.com