`mail.otcourse.com`

DNSSEC	⚠️ Not signed
A	13.248.169.48^{🇺🇸 Amazon13.248.160.0/20}
		PTR	`a904c694c05102f30.awsglobalaccelerator.com`
A	76.223.54.146^{🇺🇸 Amazon76.223.48.0/20}
NS	`ns1.afternic.com` ⭐ ⚠️ Not in parent delegation
		A	2603:5:2126::45^{🇺🇸 GODADDY-DNS2603:5:2120::/44}
			PTR	`ns1.afternic.com`
		A	97.74.98.69^{🇺🇸 GODADDY-DNS97.74.98.0/23}
			PTR	`ns1.afternic.com`
NS	`ns2.afternic.com` ⚠️ Not in parent delegation
		A	2603:5:2226::45^{🇺🇸 GODADDY-DNS2603:5:2220::/44}
			PTR	`ns2.afternic.com`
		A	173.201.66.69^{🇺🇸 GODADDY-DNS173.201.66.0/23}
			PTR	`ns2.afternic.com`
TXT	`v=spf1 -all`
SOA	`ns1.afternic.com`dns@jomax.net serial=1

`otcourse.com`

	DNSSEC	⚠️ Not signed
	A	13.248.169.48^{🇺🇸 Amazon13.248.160.0/20}
	A	76.223.54.146^{🇺🇸 Amazon76.223.48.0/20}
	NS	`ns1.afternic.com` ⭐
	NS	`ns2.afternic.com`
	TXT	`v=spf1 -all`
	SOA	`ns1.afternic.com`dns@jomax.net serial=1

Same first word

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DNS History

5 records (4 active, 1 former)

●NSns1.afternic.com2026-02-18 → 2026-03-31 · 2 obs

● 2026-02-18 07:42:38
● 2026-03-31 17:07:12

●NSns2.afternic.com2026-02-18 → 2026-03-31 · 2 obs

● 2026-02-18 07:42:38
● 2026-03-31 17:07:12

○MX.2026-02-18 → 2026-03-31 · 2 obs

○ 2026-02-18 07:42:38
○ 2026-03-31 17:07:12

●A13.248.169.482026-02-18 → 2026-03-31 · 2 obs

● 2026-02-18 07:42:38
● 2026-03-31 17:07:12

●A76.223.54.1462026-02-18 → 2026-03-31 · 2 obs

● 2026-02-18 07:42:38
● 2026-03-31 17:07:12

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	d.gtld-servers.net, f.gtld-servers.net, a.gtld-servers.net, j.gtld-servers.net...	-
otcourse.com	ns1.afternic.com, ns2.afternic.com	4 records

✅ Authoritative Response

Server:97.74.98.69

NS records: ns1.afternic.com, ns2.afternic.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for otcourse.com (unsigned zone)

⏱️ Timing

Total: 100ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`76.223.54.146, 13.248.169.48`
NS	2	`ns1.afternic.com, ns2.afternic.com`
MX	1	`. (pri: 0)`
TXT	1	`v=spf1 -all`
SOA	1	`ns1.afternic.com dns.jomax.net`

📌 Glue Records Collected

Total: 4

Out-of-bailiwick: 4 (ns1.afternic.com, ns1.afternic.com, ns2.afternic.com...)

Analysis

IP Addresses

mail.otcourse.com points to two IP numbers: 13.248.169.48 and 76.223.54.146.

Other host names, for instance swimgold.com, noc.hostingpanama.com, zontom.com, hostmaster.estation.net and dk(0x706f726e).com share IP numbers with mail.otcourse.com.

Name Servers

mail.otcourse.com's delegation is to two name servers ns1.afternic.com and ns2.afternic.com.

mail.otcourse.com shares the same name server configuration as other domains, such as host3.blazeservice.com, autodiscover.ananas.digital, host-203-133-102-145.ip.kbtelecom.net, phoneratika.(0x736578).video and cleantrading.com.

mail.otcourse.com at least partially shares its name servers with other domains, for instance aqiwa.com, fx-cm.com, creationsforthecure.com, adverage.com and jrswelding.com.

These name servers are often used together with the name servers verification-mt4kppox65xj994jdmttdg.ns101.verify.hn.

Host names with two IP numbers: ns1.afternic.com points to 2603:5:2126::45 and 97.74.98.69; ns2.afternic.com points to 2603:5:2226::45 and 173.201.66.69

mail.otcourse.com - robtex.com