`practicum.courses`

DNSSEC	⚠️ Not signed
NS	`ns3.yandex.ru` ⭐
		A	2a02:6b8::1001^{🇷🇺 TELETECH2a02:6b8::/32 Yandex network}
			PTR	`ns3.yandex.ru`
		A	87.250.250.1^{🇷🇺 TELETECH87.250.224.0/19 Yandex network}
			PTR	`ns3.yandex.ru`
NS	`ns4.yandex.ru`
		A	2a02:6b8:0:1::1:1^{🇷🇺 TELETECH2a02:6b8::/32 Yandex network}
			PTR	`ns4.yandex.ru`
		A	77.88.21.1^{🇷🇺 TELETECH77.88.0.0/18 Yandex enterprise network}
			PTR	`ns4.yandex.ru`
SOA	`ns3.yandex.ru`sysadmin@yandex.ru serial=1780429730

`courses`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.nic.courses` ⭐
	NS	`b.nic.courses`
	NS	`c.nic.courses`
	NS	`x.nic.courses`
	NS	`y.nic.courses`
	NS	`z.nic.courses`
	SOA	`a.nic.courses`admin@tldns.godaddy serial=1780429443

Same first word

practicum.education

practicum.yandex

practicum.eu

practicum.com

practicum.business

practicum.courses

practicum.tech

practicum.co.th

practicum.dk

practicum.ac.uk

practicum.ca

practicum.net

practicum.pro

practicum.es

practicum.biz

practicum.info

practicum.nl

practicum.se

practicum.group

practicum.org

practicum.in

Similar names

cruimpact.com

cruimpact.net

cruimpact.org

DNS History

2 records (2 active, 0 former)

●NSns3.yandex.ru2026-04-26 → 2026-06-02 · 2 obs

● 2026-04-26 22:03:08
● 2026-06-02 19:48:50

●NSns4.yandex.ru2026-04-26 → 2026-06-02 · 2 obs

● 2026-04-26 22:03:08
● 2026-06-02 19:48:50

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
courses	a.nic.courses, b.nic.courses, c.nic.courses, x.nic.courses...	12 records
practicum.courses	ns3.yandex.ru, ns4.yandex.ru	-

✅ Authoritative Response

Server:87.250.250.1

NS records: ns3.yandex.ru, ns4.yandex.ru

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for practicum.courses (unsigned zone)

⏱️ Timing

Total: 1617ms | Queries: -

📄 Records

Type	Count	Sample Data
NS	2	`ns3.yandex.ru, ns4.yandex.ru`
SOA	1	`ns3.yandex.ru sysadmin.yandex.ru`

📌 Glue Records Collected

Total: 12

In-bailiwick: 12 (a.nic.courses, a.nic.courses, b.nic.courses...)

Analysis

Name Servers

The NS records for practicum.courses delegate to ns3.yandex.ru and ns4.yandex.ru.

practicum.courses has the same name server delegation as a number of other domains, such as 198.180.213.in-addr.arpa, yandex.education, praktikum.yandex.ru and two more.

ns3.yandex.ru resolves to 87.250.250.1 and 2a02:6b8::1001. Likewise, ns4.yandex.ru resolves to 77.88.21.1 and 2a02:6b8:0:1::1:1 — two IP addresses apiece.

practicum.courses - robtex.com