`czechclass101.com`

DNSSEC	⚠️ Not signed
A	18.154.227.50^{🇺🇸 Amazon}
		PTR	`server-18-154-227-50.iad55.r.cloudfront.net`
A	18.154.227.64^{🇺🇸 Amazon}
A	18.154.227.78^{🇺🇸 Amazon}
A	18.154.227.104^{🇺🇸 Amazon}
NS	`ns-1076.awsdns-06.org` ⭐
		A	2600:9000:5304:3400::1^{🇺🇸 Amazon}
			PTR	`ns-1076.awsdns-06.org`
		A	205.251.196.52^{🇺🇸 Amazon}
			PTR	`ns-1076.awsdns-06.org`
NS	`ns-1872.awsdns-42.co.uk`
		A	2600:9000:5307:5000::1^{🇺🇸 Amazon}
			PTR	`ns-1872.awsdns-42.co.uk`
		A	205.251.199.80^{🇺🇸 Amazon}
			PTR	`ns-1872.awsdns-42.co.uk`
NS	`ns-783.awsdns-33.net`
		A	2600:9000:5303:f00::1^{🇺🇸 Amazon}
			PTR	`ns-783.awsdns-33.net`
		A	205.251.195.15^{🇺🇸 Amazon}
			PTR	`ns-783.awsdns-33.net`
NS	`ns-90.awsdns-11.com`
		A	2600:9000:5300:5a00::1^{🇺🇸 Amazon}
			PTR	`ns-90.awsdns-11.com`
		A	205.251.192.90^{🇺🇸 Amazon}
			PTR	`ns-90.awsdns-11.com`
MX	`smtp.google.com` ⭐
		A	2607:f8b0:4023:1004::1a^{🇺🇸 Google}
			PTR	`rq-in-f26.1e100.net`
		A	2607:f8b0:4023:1004::1b^{🇺🇸 Google}
			PTR	`rq-in-f27.1e100.net`
		A	2607:f8b0:4023:1011::1a^{🇺🇸 Google}
			PTR	`ncdfwo-in-f26.1e100.net`
		A	2607:f8b0:4023:1011::1b^{🇺🇸 Google}
			PTR	`ncdfwo-in-f27.1e100.net`
		A	142.250.26.26^{🇺🇸 Google}
			PTR	`ncdfwo-in-f26.1e100.net`
		A	142.250.26.27^{🇺🇸 Google}
			PTR	`ncdfwo-in-f27.1e100.net`
		A	142.250.114.27^{🇺🇸 Google}
			PTR	`rr-in-f27.1e100.net`
		A	142.250.115.26^{🇺🇸 Google}
			PTR	`rq-in-f26.1e100.net`
		A	142.250.115.27^{🇺🇸 Google}
			PTR	`rq-in-f27.1e100.net`
TXT	`v=spf1 a mx ip4:174.121.173.186 ip4:50.97.118.61 ip4:54.88.224.176 include:_s...`
SOA	`ns-1076.awsdns-06.org`awsdns-hostmaster@amazon.com serial=1

`com`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.gtld-servers.net` ⭐
	NS	`b.gtld-servers.net`
	NS	`c.gtld-servers.net`
	NS	`d.gtld-servers.net`
	NS	`e.gtld-servers.net`
	NS	`f.gtld-servers.net`
	NS	`g.gtld-servers.net`
	NS	`h.gtld-servers.net`
	NS	`i.gtld-servers.net`
	NS	`j.gtld-servers.net`
	NS	`k.gtld-servers.net`
	NS	`l.gtld-servers.net`
	NS	`m.gtld-servers.net`
	SOA	`a.gtld-servers.net`nstld@verisign-grs.com serial=1771291435

Up

mail.czechclass101.com

www.czechclass101.com

Same first word

czechclass101.com

DNS History

26 records (9 active, 17 former)

●NSns-1076.awsdns-06.org2020-02-16 → 2026-02-23 · 3 obs

○ 2017-01-06 09:20:58
● 2020-02-16 20:12:44
● 2026-02-23 07:23:20

●NSns-1872.awsdns-42.co.uk2020-02-16 → 2026-02-23 · 3 obs

○ 2017-01-06 09:20:58
● 2020-02-16 20:12:44
● 2026-02-23 07:23:20

●NSns-783.awsdns-33.net2020-02-16 → 2026-02-23 · 3 obs

○ 2017-01-06 09:20:58
● 2020-02-16 20:12:44
● 2026-02-23 07:23:20

●NSns-90.awsdns-11.com2020-02-16 → 2026-02-23 · 3 obs

○ 2017-01-06 09:20:58
● 2020-02-16 20:12:44
● 2026-02-23 07:23:20

○NSpdns01.domaincontrol.com2015-06-17 → 2017-01-06 · 4 obs

● 2015-06-17 21:51:50
● 2017-01-06 09:20:58
○ 2020-02-16 20:12:44
○ 2026-02-23 07:23:20

○NSpdns02.domaincontrol.com2015-06-17 → 2017-01-06 · 4 obs

● 2015-06-17 21:51:50
● 2017-01-06 09:20:58
○ 2020-02-16 20:12:44
○ 2026-02-23 07:23:20

○MXmail.czechclass101.com2015-06-17 → 2017-01-06 · 4 obs

● 2015-06-17 21:51:50
● 2017-01-06 09:20:58
○ 2020-02-16 20:12:44
○ 2026-02-23 07:23:20

○MXmx.languagepod101.com2020-02-16 → 2020-02-16 · 4 obs

○ 2017-01-06 09:20:58
● 2020-02-16 20:12:44
○ 2026-02-15 18:04:44
○ 2026-02-23 07:23:20

●MXsmtp.google.com2026-02-15 → 2026-02-23 · 3 obs

○ 2020-02-16 20:12:44
● 2026-02-15 18:04:44
● 2026-02-23 07:23:20

○A13.224.227.1192020-02-16 → 2020-02-16 · 4 obs

○ 2017-01-06 09:20:58
● 2020-02-16 20:12:44
○ 2026-02-15 18:04:44
○ 2026-02-23 07:23:20

○A13.224.227.822020-02-16 → 2020-02-16 · 4 obs

○ 2017-01-06 09:20:58
● 2020-02-16 20:12:44
○ 2026-02-15 18:04:44
○ 2026-02-23 07:23:20

○A13.224.227.902020-02-16 → 2020-02-16 · 4 obs

○ 2017-01-06 09:20:58
● 2020-02-16 20:12:44
○ 2026-02-15 18:04:44
○ 2026-02-23 07:23:20

○A13.224.227.992020-02-16 → 2020-02-16 · 4 obs

○ 2017-01-06 09:20:58
● 2020-02-16 20:12:44
○ 2026-02-15 18:04:44
○ 2026-02-23 07:23:20

○A18.154.206.122026-02-21 → 2026-02-22 · 7 obs

○ 2026-02-19 18:32:26
● 2026-02-21 12:44:54
○ 2026-02-21 14:38:46
○ 2026-02-22 09:05:20
● 2026-02-22 15:05:50
○ 2026-02-22 16:10:12
○ 2026-02-23 07:23:20

○A18.154.206.152026-02-21 → 2026-02-22 · 7 obs

○ 2026-02-19 18:32:26
● 2026-02-21 12:44:54
○ 2026-02-21 14:38:46
○ 2026-02-22 09:05:20
● 2026-02-22 15:05:50
○ 2026-02-22 16:10:12
○ 2026-02-23 07:23:20

○A18.154.206.422026-02-21 → 2026-02-22 · 7 obs

○ 2026-02-19 18:32:26
● 2026-02-21 12:44:54
○ 2026-02-21 14:38:46
○ 2026-02-22 09:05:20
● 2026-02-22 15:05:50
○ 2026-02-22 16:10:12
○ 2026-02-23 07:23:20

○A18.154.206.652026-02-21 → 2026-02-22 · 7 obs

○ 2026-02-19 18:32:26
● 2026-02-21 12:44:54
○ 2026-02-21 14:38:46
○ 2026-02-22 09:05:20
● 2026-02-22 15:05:50
○ 2026-02-22 16:10:12
○ 2026-02-23 07:23:20

●A18.154.227.1042026-02-21 → 2026-02-23 · 8 obs

○ 2026-02-21 12:44:54
● 2026-02-21 14:38:46
● 2026-02-22 09:05:20
○ 2026-02-22 15:05:50
● 2026-02-22 16:10:12
○ 2026-02-22 22:30:52
● 2026-02-23 07:23:18
● 2026-02-23 07:23:20

●A18.154.227.502026-02-21 → 2026-02-23 · 8 obs

○ 2026-02-21 12:44:54
● 2026-02-21 14:38:46
● 2026-02-22 09:05:20
○ 2026-02-22 15:05:50
● 2026-02-22 16:10:12
○ 2026-02-22 22:30:52
● 2026-02-23 07:23:18
● 2026-02-23 07:23:20

●A18.154.227.642026-02-21 → 2026-02-23 · 8 obs

○ 2026-02-21 12:44:54
● 2026-02-21 14:38:46
● 2026-02-22 09:05:20
○ 2026-02-22 15:05:50
● 2026-02-22 16:10:12
○ 2026-02-22 22:30:52
● 2026-02-23 07:23:18
● 2026-02-23 07:23:20

●A18.154.227.782026-02-21 → 2026-02-23 · 8 obs

○ 2026-02-21 12:44:54
● 2026-02-21 14:38:46
● 2026-02-22 09:05:20
○ 2026-02-22 15:05:50
● 2026-02-22 16:10:12
○ 2026-02-22 22:30:52
● 2026-02-23 07:23:18
● 2026-02-23 07:23:20

○A18.165.201.1072026-02-15 → 2026-02-22 · 8 obs

○ 2020-02-16 20:12:44
● 2026-02-15 18:04:44
● 2026-02-19 18:32:26
○ 2026-02-21 12:44:54
○ 2026-02-22 16:10:12
● 2026-02-22 22:30:52
○ 2026-02-23 07:23:18
○ 2026-02-23 07:23:20

○A18.165.201.112026-02-15 → 2026-02-22 · 8 obs

○ 2020-02-16 20:12:44
● 2026-02-15 18:04:44
● 2026-02-19 18:32:26
○ 2026-02-21 12:44:54
○ 2026-02-22 16:10:12
● 2026-02-22 22:30:52
○ 2026-02-23 07:23:18
○ 2026-02-23 07:23:20

○A18.165.201.372026-02-15 → 2026-02-22 · 8 obs

○ 2020-02-16 20:12:44
● 2026-02-15 18:04:44
● 2026-02-19 18:32:26
○ 2026-02-21 12:44:54
○ 2026-02-22 16:10:12
● 2026-02-22 22:30:52
○ 2026-02-23 07:23:18
○ 2026-02-23 07:23:20

○A18.165.201.642026-02-15 → 2026-02-22 · 8 obs

○ 2020-02-16 20:12:44
● 2026-02-15 18:04:44
● 2026-02-19 18:32:26
○ 2026-02-21 12:44:54
○ 2026-02-22 16:10:12
● 2026-02-22 22:30:52
○ 2026-02-23 07:23:18
○ 2026-02-23 07:23:20

○A184.168.221.132015-06-17 → 2017-01-06 · 4 obs

● 2015-06-17 21:51:50
● 2017-01-06 09:20:58
○ 2020-02-16 20:12:44
○ 2026-02-23 07:23:20

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
czechclass101.com	ns-90.awsdns-11.com, ns-783.awsdns-33.net, ns-1076.awsdns-06.org, ns-1872.awsdns-42.co.uk	-

✅ Authoritative Response

Server: 205.251.192.90

NS records: ns-90.awsdns-11.com, ns-783.awsdns-33.net, ns-1076.awsdns-06.org, ns-1872.awsdns-42.co.uk

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for czechclass101.com (unsigned zone)

⏱️ Timing

Total: 569ms | Queries: -

📄 Records

Type	Count	Sample Data
A	4	`18.154.227.78, 18.154.227.104...`
NS	4	`ns-1076.awsdns-06.org, ns-1872.awsdns-42.co.uk...`
MX	1	`smtp.google.com (pri: 1)`
TXT	1	`v=spf1 a mx ip4:174.121.173.186 ip4:50.9`
SOA	1	`ns-1076.awsdns-06.org awsdns-hostmaster.`

AI analysis

czechclass101.com is a parent of mail.czechclass101.com and www.czechclass101.com.

czechclass101.com maps to four IP numbers: 18.154.227.50, 18.154.227.64, 18.154.227.78 and 18.154.227.104.

Other host names, for instance daspromotion.de, www.logicdrop.com, www.purduesoccercamps.com, d79718e06b5f.2e0adbf5.us-west-2.token.awswaf.com and acuvue-erleben.de share IP numbers with czechclass101.com.

czechclass101.com is delegated to four name servers: ns-90.awsdns-11.com, ns-783.awsdns-33.net, ns-1076.awsdns-06.org and ns-1872.awsdns-42.co.uk.

czechclass101.com at least partially shares name servers with other domains such as 53.202.121.in-addr.arpa, avcaptureall.cloud, encontact.tmp.br, yahsat.com.br and trf5.gov.br.

Host names with two IP numbers:

ns-90.awsdns-11.com points to 2600:9000:5300:5a00::1 and 205.251.192.90

ns-783.awsdns-33.net points to 2600:9000:5303:f00::1 and 205.251.195.15

ns-1076.awsdns-06.org points to 2600:9000:5304:3400::1 and 205.251.196.52

ns-1872.awsdns-42.co.uk points to 2600:9000:5307:5000::1 and 205.251.199.80

czechclass101.com is handled by a single mail server, smtp.google.com.

czechclass101.com shares the same mail server setup as other domains, including ozgrup.net, hanmi.jp, sophiahotels.net, thumbsup.in.th and pathly.com.

czechclass101.com shares mail servers with other domains at least in part, for instance lithym.com, bestandco.com.au, moonravendesigns.com, ssssclub.com and clear-protect.com.

These mail servers are often used together with alt1.aspmx.l.google.com, alt2.aspmx.l.google.com, aspmx.l.google.com, alt3.aspmx.l.google.com and alt4.aspmx.l.google.com.

Host name smtp.google.com points to nine IP numbers: 2607:f8b0:4023:1004::1a, 2607:f8b0:4023:1004::1b, 2607:f8b0:4023:1011::1a, 2607:f8b0:4023:1011::1b, 142.250.26.26, 142.250.26.27, 142.250.114.27, 142.250.115.26 and 142.250.115.27.

czechclass101.com - robtex.com