`koubou-nu.com`

DNSSEC	⚠️ Not signed
A	114.17.21.149^{🇯🇵 KDDI114.17.0.0/16}
		PTR	`dns5.n-server.com`
NS	`ns.koubou-nu.com` ⭐ ⚠️ Not in parent delegation
		A	114.17.21.149^{🇯🇵 KDDI114.17.0.0/16}
			PTR	`dns5.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	`dns5.n-server.com` ⚠️ Not in zone NS records
		A	114.17.21.149^{🇯🇵 KDDI114.17.0.0/16}
			PTR	`dns5.n-server.com`
MX	`mail.koubou-nu.com` ⭐
		A	114.17.21.149^{🇯🇵 KDDI114.17.0.0/16}
			PTR	`dns5.n-server.com`
TXT	`v=spf1 +a +mx -all`
SOA	`ns.koubou-nu.com`plesk@purenic.jp 2025-10-15 #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=1775946302

Subdomains

ns.koubou-nu.com

mail.koubou-nu.com

Same first word

koubou-nu.com

DNS History

6 records (5 active, 1 former)

●NSdns136.n-server.com2026-03-30 → 2026-04-11 · 3 obs

○ 2015-08-12 15:51:30
● 2026-03-30 22:20:20
● 2026-04-11 22:46:18

●NSdns5.n-server.com2026-03-30 → 2026-04-11 · 3 obs

○ 2015-08-12 15:51:30
● 2026-03-30 22:20:20
● 2026-04-11 22:46:18

●NSns.koubou-nu.com2015-08-12 → 2026-04-11 · 2 obs

● 2015-08-12 15:51:30
● 2026-04-11 22:46:18

●MXmail.koubou-nu.com2015-08-12 → 2026-04-11 · 2 obs

● 2015-08-12 15:51:30
● 2026-04-11 22:46:18

●A114.17.21.1492026-03-30 → 2026-04-11 · 3 obs

○ 2020-03-11 20:04:02
● 2026-03-30 22:20:20
● 2026-04-11 22:46:18

○A210.254.102.2012015-08-12 → 2020-03-11 · 4 obs

● 2015-08-12 15:51:30
● 2020-03-11 20:04:02
○ 2026-03-30 22:20:20
○ 2026-04-11 22:46:18

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	l.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net...	-
koubou-nu.com	dns5.n-server.com, dns136.n-server.com	2 records

✅ Authoritative Response

Server:114.17.21.136

NS records: dns5.n-server.com, dns136.n-server.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for koubou-nu.com (unsigned zone)

⏱️ Timing

Total: 408ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`114.17.21.149`
NS	1	`ns.koubou-nu.com`
MX	1	`mail.koubou-nu.com (pri: 10)`
TXT	1	`v=spf1 +a +mx -all`
SOA	1	`ns.koubou-nu.com plesk.purenic.jp`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (dns5.n-server.com, dns136.n-server.com)

Analysis

Hierarchy

koubou-nu.com is parent of ns.koubou-nu.com and mail.koubou-nu.com.

IP Addresses

koubou-nu.com resolves to a single IP address: 114.17.21.149.

Other host names including yk-air.com, ns.egao4618.com, mail.newtown-chuo.com, mail.koubou-nu.com and k1ckbox1ng.com share IP numbers with koubou-nu.com.

Name Servers

koubou-nu.com is delegated to three name servers: ns.koubou-nu.com, dns136.n-server.com and dns5.n-server.com.

koubou-nu.com at least partially shares name servers with other domains, including kilatto-rihabiri.com, newtown-chuo.com, ookado.jp, ags-2012.com and candor.jp.

These name servers are typically used together with the name servers dns12.n-server.com, dns14.n-server.com, dns10.n-server.com, dns19.n-server.com, dns7.n-server.com, dns20.n-server.com, dns16.n-server.com, dns3.n-server.com, dns15.n-server.com and p03ns11.puretopure.jp.

Host names with one IP:

ns.koubou-nu.com points to 114.17.21.149; dns136.n-server.com points to 114.17.21.136; dns5.n-server.com points to 114.17.21.149. Host names pointing to 114.17.21.149: ns.koubou-nu.com and dns5.n-server.com.

Mail Servers

koubou-nu.com is handled by a single mail server, mail.koubou-nu.com.

mail.koubou-nu.com points to a single IP: 114.17.21.149.

koubou-nu.com - robtex.com

koubou-nu.com

com