`tokyo-computer.ac.jp`

DNSSEC	⚠️ Not signed
A	210.166.208.151^{🇯🇵 PROX210.166.208.0/20 PNAP-TOK prox}
		PTR	`ns.tokyo-computer.ac.jp`
NS	`ns.tokyo-computer.ac.jp` ⭐
		A	210.166.208.151^{🇯🇵 PROX210.166.208.0/20 PNAP-TOK prox}
			PTR	`ns.tokyo-computer.ac.jp`
NS	`dns2.ixent.ne.jp`
		A	210.143.106.4^{🇯🇵 PROX210.143.96.0/20 PNAP-TOK prox}
			PTR	`dns2.ixent.ne.jp`
NS	`ns2.sphere.ad.jp` ⚠️ Not in zone NS records
		A	2001:2c0:11:1::a02^{🇯🇵 InfoSphere2001:2c0::/35 INFOSPHERE}
			PTR	`ns2.sphere.ad.jp`
		A	202.239.113.26^{🇯🇵 InfoSphere202.239.64.0/18 INFOSPHERE}
			PTR	`ns2.sphere.ad.jp`
MX	`mail.tokyo-computer.ac.jp` ⭐
SOA	`ns.tokyo-computer.ac.jp`root@tokyo-computer.ac.jp 2010-06-10 #1

`ac.jp`

	DNSSEC	⚠️ Not signed
	TXT	`ac.jp.`

WOT: SAFE (80/100)

Subdomains

mail.tokyo-computer.ac.jp

ns.tokyo-computer.ac.jp

Same first word

tokyo-computer.ac.jp

DNS History

6 records (5 active, 1 former)

●NSdns2.ixent.ne.jp2007-08-14 → 2026-05-15 · 2 obs

● 2007-08-14 22:32:38
● 2026-05-15 07:46:20

●NSns.tokyo-computer.ac.jp2007-08-14 → 2026-05-15 · 2 obs

● 2007-08-14 22:32:38
● 2026-05-15 07:46:20

●NSns2.sphere.ad.jp2026-03-13 → 2026-05-15 · 3 obs

○ 2007-08-14 22:32:38
● 2026-03-13 18:34:52
● 2026-05-15 07:46:20

●MXmail.tokyo-computer.ac.jp2007-08-14 → 2026-05-15 · 5 obs

● 2007-08-14 22:32:38
● 2017-10-23 05:41:08
○ 2026-03-13 18:34:52
● 2026-03-16 20:14:22
● 2026-05-15 07:46:20

○A202.228.239.52007-08-14 → 2007-08-14 · 3 obs

● 2007-08-14 22:32:38
○ 2015-08-09 19:28:38
○ 2026-05-15 07:46:20

●A210.166.208.1512015-08-09 → 2026-05-15 · 6 obs

○ 2007-08-14 22:32:38
● 2015-08-09 19:28:38
● 2026-03-16 20:14:22
○ 2026-03-25 18:41:32
● 2026-05-15 07:46:18
● 2026-05-15 07:46:20

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
jp	a.dns.jp, b.dns.jp, c.dns.jp, d.dns.jp...	-
tokyo-computer.ac.jp	ns.tokyo-computer.ac.jp, ns2.sphere.ad.jp, dns2.ixent.ne.jp	4 records

✅ Authoritative Response

Server:210.166.208.151

NS records: ns.tokyo-computer.ac.jp, ns2.sphere.ad.jp, dns2.ixent.ne.jp

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for tokyo-computer.ac.jp (unsigned zone)

⏱️ Timing

Total: 1119ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`210.166.208.151`
NS	2	`dns2.ixent.ne.jp, ns.tokyo-computer.ac.jp`
MX	1	`mail.tokyo-computer.ac.jp (pri: 10)`
SOA	1	`ns.tokyo-computer.ac.jp root.tokyo-compu`

📌 Glue Records Collected

Total: 4

In-bailiwick: 1 (ns.tokyo-computer.ac.jp)

Out-of-bailiwick: 3 (ns2.sphere.ad.jp, dns2.ixent.ne.jp, ns2.sphere.ad.jp)

Analysis

Hierarchy

tokyo-computer.ac.jp is a parent of mail.tokyo-computer.ac.jp and ns.tokyo-computer.ac.jp.

IP Addresses

tokyo-computer.ac.jp points to a single IP number: 210.166.208.151.

Other host names, for instance ns.tokyo-computer.ac.jp, share IP numbers with tokyo-computer.ac.jp.

Name Servers

The delegation for tokyo-computer.ac.jp is handled by three name servers: ns.tokyo-computer.ac.jp, ns2.sphere.ad.jp and dns2.ixent.ne.jp.

tokyo-computer.ac.jp at least partially shares name servers with other domains, for instance 120.197.61.in-addr.arpa, 28.44.163.in-addr.arpa, pcs.ne.jp, beprime.co.jp and floor-sangyo.co.jp.

These name servers are commonly used together with ns1.sphere.ad.jp, admin.hitwave.or.jp, dns1.ixent.ne.jp, dns.ah-s.com, ns.kssrv.jp, ns.boso-net.jp, ns.dreamnetwork.jp, ns2.wisnet.jp and ns.wisnet.jp.

Host names with two IP numbers:

ns2.sphere.ad.jp points to 2001:2c0:11:1::a02 and 202.239.113.26.

Host names with one IP number:

ns.tokyo-computer.ac.jp points to 210.166.208.151.

dns2.ixent.ne.jp points to 210.143.106.4.

Mail Servers

tokyo-computer.ac.jp is handled by a single mail server, mail.tokyo-computer.ac.jp.

tokyo-computer.ac.jp - robtex.com