`schulkalender.ch`

DNSSEC	🔒 Signed (DS record present)
A	193.108.136.178^{🇨🇭 AS-TINEO193.108.136.0/23 Nextron}
		PTR	`sv8.helpmedia.ch`
NS	`dns2.nextron.ch` ⭐ ⚠️ Not in parent delegation
		A	193.108.137.3^{🇨🇭 AS-TINEO193.108.136.0/23 Nextron}
			PTR	`dns2.nextron.ch`
NS	`dns.nextron.ch` ⚠️ Not in parent delegation
		A	193.108.137.2^{🇨🇭 AS-TINEO193.108.136.0/23 Nextron}
			PTR	`dns.nextron.ch`
NS	`dns3.nextron.ch` ⚠️ Not in parent delegation
		A	31.171.251.198^{🇨🇭 CLOUDSIGMA-AS31.171.251.0/24 CloudSigma}
			PTR	`dns3.nextron.ch`
NS	`ns1.help.ch` ⚠️ Not in zone NS records
		A	193.108.137.2^{🇨🇭 AS-TINEO193.108.136.0/23 Nextron}
			PTR	`dns.nextron.ch`
NS	`ns2.help.ch` ⚠️ Not in zone NS records
		A	193.108.137.3^{🇨🇭 AS-TINEO193.108.136.0/23 Nextron}
			PTR	`dns2.nextron.ch`
NS	`ns3.help.ch` ⚠️ Not in zone NS records
		A	31.171.251.198^{🇨🇭 CLOUDSIGMA-AS31.171.251.0/24 CloudSigma}
			PTR	`dns3.nextron.ch`
SOA	`dns.nextron.ch`hostmaster@nextron.ch 2026-03-27 #1

`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 2026-03-27 #35

Same first word

schulkalender.com

schulkalender.org

schulkalender.ch

schulkalender.at

schulkalender.de

DNS History

11 records (7 active, 4 former)

●NSdns.nextron.ch2015-06-26 → 2026-03-27 · 2 obs

● 2015-06-26 09:25:42
● 2026-03-27 17:24:16

○NSdns.nextron.ch.schulkalender.ch2015-06-26 → 2017-03-28 · 4 obs

● 2015-06-26 09:25:42
● 2017-03-28 08:30:22
○ 2026-03-27 17:24:14
○ 2026-03-27 17:24:16

●NSdns2.nextron.ch2026-03-27 → 2026-03-27 · 3 obs

○ 2017-03-28 08:30:22
● 2026-03-27 17:24:14
● 2026-03-27 17:24:16

○NSdns2.nextron.ch.schulkalender.ch2015-06-26 → 2017-03-28 · 4 obs

● 2015-06-26 09:25:42
● 2017-03-28 08:30:22
○ 2026-03-27 17:24:14
○ 2026-03-27 17:24:16

●NSdns3.nextron.ch2026-03-27 → 2026-03-27 · 3 obs

○ 2017-03-28 08:30:22
● 2026-03-27 17:24:14
● 2026-03-27 17:24:16

○NSdns3.nextron.ch.schulkalender.ch2015-06-26 → 2017-03-28 · 4 obs

● 2015-06-26 09:25:42
● 2017-03-28 08:30:22
○ 2026-03-27 17:24:14
○ 2026-03-27 17:24:16

●NSns1.help.ch2026-03-27 → 2026-03-27 · 3 obs

○ 2017-03-28 08:30:22
● 2026-03-27 17:24:14
● 2026-03-27 17:24:16

●NSns2.help.ch2026-03-27 → 2026-03-27 · 3 obs

○ 2017-03-28 08:30:22
● 2026-03-27 17:24:14
● 2026-03-27 17:24:16

●NSns3.help.ch2026-03-27 → 2026-03-27 · 3 obs

○ 2017-03-28 08:30:22
● 2026-03-27 17:24:14
● 2026-03-27 17:24:16

○A193.108.136.1742015-06-26 → 2017-03-28 · 4 obs

● 2015-06-26 09:25:42
● 2017-03-28 08:30:22
○ 2026-03-27 17:24:14
○ 2026-03-27 17:24:16

●A193.108.136.1782026-03-27 → 2026-03-27 · 3 obs

○ 2017-03-28 08:30:22
● 2026-03-27 17:24:14
● 2026-03-27 17:24:16

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
ch	b.nic.ch, e.nic.ch, a.nic.ch, d.nic.ch...	-
schulkalender.ch	ns1.help.ch, ns2.help.ch, ns3.help.ch	-

✅ Authoritative Response

Server:193.108.137.2

NS records: ns1.help.ch, ns2.help.ch, ns3.help.ch

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 1783ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`193.108.136.178`
NS	3	`dns.nextron.ch, dns2.nextron.ch...`
SOA	1	`dns.nextron.ch hostmaster.nextron.ch`

Analysis

IP Addresses

schulkalender.ch resolves to one IP number: 193.108.136.178.

other host names including cities.ch, tierhandlung.ch, kabelonline.ch, html5.ch and elternweb.ch share IP numbers with schulkalender.ch.

Name Servers

schulkalender.ch is delegated to six name servers: ns1.help.ch, ns2.help.ch, ns3.help.ch, dns2.nextron.ch, dns3.nextron.ch and dns.nextron.ch.

schulkalender.ch at least partially shares name servers with other domains, for instance fernsehlotterie.ch, spielmann-consulting.com, sanacard.ch, myown.ch and bbplaw.ch.

Host names with one IP number:

The host name ns1.help.ch points to: 193.108.137.2.

The host name ns2.help.ch points to: 193.108.137.3.

The host name ns3.help.ch points to: 31.171.251.198.

The host name dns2.nextron.ch points to: 193.108.137.3.

The host name dns3.nextron.ch points to: 31.171.251.198.

The host name dns.nextron.ch points to: 193.108.137.2.

Host names that point to 193.108.137.2: ns1.help.ch and dns.nextron.ch.

Host names that point to 193.108.137.3: ns2.help.ch and dns2.nextron.ch.

Host names that point to 31.171.251.198: ns3.help.ch and dns3.nextron.ch.

schulkalender.ch - robtex.com