`gakunan.com`

DNSSEC	⚠️ Not signed
A	114.17.21.146^{🇯🇵 KDDI114.17.0.0/16}
		PTR	`dns20.n-server.com`
NS	`ns.gakunan.com` ⭐ ⚠️ Not in parent delegation
		A	114.17.21.146^{🇯🇵 KDDI114.17.0.0/16}
			PTR	`dns20.n-server.com`
NS	`dns136.n-server.com` ⚠️ Not in zone NS records
		A	114.17.21.136^{🇯🇵 KDDI114.17.0.0/16}
			PTR	`dns136.n-server.com`
NS	`dns20.n-server.com` ⚠️ Not in zone NS records
		A	114.17.21.146^{🇯🇵 KDDI114.17.0.0/16}
			PTR	`dns20.n-server.com`
MX	`mail.gakunan.com` ⭐
		A	114.17.21.146^{🇯🇵 KDDI114.17.0.0/16}
			PTR	`dns20.n-server.com`
TXT	`v=spf1 +a +mx -all +a:dns20.n-server.com`
SOA	`ns.gakunan.com`plesk@purenic.jp 2025-10-08 #2

`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=1775940827

Subdomains

ns.gakunan.com

mail.gakunan.com

Same first word

gakunan.co.jp

Similar names

guankan.tk

kuangan.com

angkuan.com

DNS History

7 records (5 active, 2 former)

●NSdns136.n-server.com2026-04-11 → 2026-04-11 · 3 obs

○ 2015-06-13 11:37:00
● 2026-04-11 20:57:52
● 2026-04-11 20:57:54

●NSdns20.n-server.com2026-04-11 → 2026-04-11 · 3 obs

○ 2015-06-13 11:37:00
● 2026-04-11 20:57:52
● 2026-04-11 20:57:54

●NSns.gakunan.com2015-06-13 → 2026-04-11 · 2 obs

● 2015-06-13 11:37:00
● 2026-04-11 20:57:54

●MXmail.gakunan.com2015-06-13 → 2026-04-11 · 2 obs

● 2015-06-13 11:37:00
● 2026-04-11 20:57:54

○A106.186.69.172016-02-01 → 2017-04-24 · 5 obs

○ 2015-11-04 05:58:12
● 2016-02-01 07:42:08
● 2017-04-24 01:49:24
○ 2026-04-11 20:57:52
○ 2026-04-11 20:57:54

●A114.17.21.1462026-04-11 → 2026-04-11 · 3 obs

○ 2017-04-24 01:49:24
● 2026-04-11 20:57:52
● 2026-04-11 20:57:54

○A118.155.214.502015-06-13 → 2015-11-04 · 4 obs

● 2015-06-13 11:37:00
● 2015-11-04 05:58:12
○ 2016-02-01 07:42:08
○ 2026-04-11 20:57:54

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	l.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net...	-
gakunan.com	dns20.n-server.com, dns136.n-server.com	2 records

✅ Authoritative Response

Server:114.17.21.136

NS records: dns20.n-server.com, dns136.n-server.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for gakunan.com (unsigned zone)

⏱️ Timing

Total: 395ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`114.17.21.146`
NS	1	`ns.gakunan.com`
MX	1	`mail.gakunan.com (pri: 10)`
TXT	1	`v=spf1 +a +mx -all +a:dns20.n-server.com`
SOA	1	`ns.gakunan.com plesk.purenic.jp`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (dns20.n-server.com, dns136.n-server.com)

Analysis

Hierarchy

gakunan.com is parent of ns.gakunan.com and mail.gakunan.com.

IP Addresses

gakunan.com points to a single IP number: 114.17.21.146.

other host names for instance ns.loving-nature-aroma.com, ns.ide-garden.com, ns.oozora-paint.co.jp, ns.kaigono-tobira.co.jp and free-6226.com share IP numbers with gakunan.com.

Name Servers

gakunan.com is delegated to three name servers: ns.gakunan.com, dns136.n-server.com and dns20.n-server.com.

gakunan.com at least partially shares name servers with other domains, for instance hayashi-kodomo-clinic.or.jp, tomizawa-houmu.com, himawari-tbs.com, yoshidabakery.com and ando-shonika.com.

These name servers are often used together with the name servers dns14.n-server.com, dns15.n-server.com, dns19.n-server.com, dns12.n-server.com, dns10.n-server.com, dns3.n-server.com, dns7.n-server.com, dns16.n-server.com, dns4.n-server.com and dns5.n-server.com.

Host names with one IP number:

ns.gakunan.com points to 114.17.21.146.

dns136.n-server.com points to 114.17.21.136.

dns20.n-server.com points to 114.17.21.146.

Names pointing to 114.17.21.146: ns.gakunan.com and dns20.n-server.com.

Mail Servers

gakunan.com is handled by a single mail server, mail.gakunan.com.

Host name mail.gakunan.com points to IP address 114.17.21.146.

gakunan.com - robtex.com

gakunan.com

com