b-school.jp - robtex.com
b-school.jp
jp
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | z.dns.jp ⭐ | ||||||
| NS | a.dns.jp | ||||||
| NS | b.dns.jp | ||||||
| NS | c.dns.jp | ||||||
| NS | d.dns.jp | ||||||
| NS | e.dns.jp | ||||||
| NS | f.dns.jp | ||||||
| NS | g.dns.jp | ||||||
| NS | h.dns.jp | ||||||
| SOA | z.dns.jproot@dns.jp serial=1784997002 | ||||||
MX for
b-school.jp |
Subdomains
mail.b-school.jp |
Same first word
Similar names
DNS History
10 records (7 active, 3 former)
○NSdns1.aurens.or.jp2015-06-28 → 2015-06-28 · 3 obs
○ 2015-11-17 12:40:34
○ 2026-07-25 16:41:14
○NSns.aurens.net2015-06-28 → 2015-06-28 · 3 obs
○ 2015-11-17 12:40:34
○ 2026-07-25 16:41:14
●NSns1.xserver.jp2015-11-17 → 2026-07-25 · 3 obs
● 2015-11-17 12:40:34
● 2026-07-25 16:41:14
●NSns2.xserver.jp2015-11-17 → 2026-07-25 · 3 obs
● 2015-11-17 12:40:34
● 2026-07-25 16:41:14
●NSns3.xserver.jp2015-11-17 → 2026-07-25 · 3 obs
● 2015-11-17 12:40:34
● 2026-07-25 16:41:14
●NSns4.xserver.jp2015-11-17 → 2026-07-25 · 3 obs
● 2015-11-17 12:40:34
● 2026-07-25 16:41:14
●NSns5.xserver.jp2015-11-17 → 2026-07-25 · 3 obs
● 2015-11-17 12:40:34
● 2026-07-25 16:41:14
●MXb-school.jp2015-11-17 → 2026-07-25 · 3 obs
● 2015-11-17 12:40:34
● 2026-07-25 16:41:14
○MXmail.b-school.jp2015-06-28 → 2015-06-28 · 3 obs
○ 2015-11-17 12:40:34
○ 2026-07-25 16:41:14
●A210.173.226.932015-06-28 → 2026-07-25 · 2 obs
● 2026-07-25 16:41:14
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| jp | a.dns.jp, b.dns.jp, c.dns.jp, d.dns.jp... | - |
| b-school.jp | ns2.xserver.jp, ns3.xserver.jp, ns4.xserver.jp, ns5.xserver.jp... | 11 records |
✅ Authoritative Response
Server:183.90.224.226
NS records: ns2.xserver.jp, ns3.xserver.jp, ns4.xserver.jp, ns5.xserver.jp, ns1.xserver.jp
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for b-school.jp (unsigned zone)
⏱️ Timing
Total: 769ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 210.173.226.93 |
| NS | 5 | ns5.xserver.jp, ns1.xserver.jp... |
| MX | 1 | b-school.jp (pri: 0) |
| TXT | 1 | v=spf1 +ip4:210.173.226.93 +ip4:210.229. |
| SOA | 1 | ns1.xserver.jp root.sv0.xserver.jp |
📌 Glue Records Collected
Total: 11
Out-of-bailiwick: 11 (ns1.xserver.jp, ns1.xserver.jp, ns1.xserver.jp...)
Analysis
Hierarchy
b-school.jp serves as the parent of mail.b-school.jp.
Mail Server Role
b-school.jp is listed as a mail server for itself.
IP Addresses
b-school.jp resolves to one IP address: 210.173.226.93.
mail.b-school.jp, for instance, is one of the other host names sharing IP numbers with b-school.jp.
Name Servers
b-school.jp has five name servers, which are ns1.xserver.jp, ns2.xserver.jp, ns3.xserver.jp and two others.
b-school.jp has at least partial name server overlap with other domains, such as wakakusa-contact.com, tyabo611.xsrv.jp, mangasouko-okinawa.com and two others.
It is common to see these name servers used together with name servers ns4.xserver.jp and ns5.xserver.jp.
Hostnames that resolve to three IP addresses:
The hostname ns1.xserver.jp directs to 202.226.36.164, 202.226.36.170 and 202.226.36.246.
The hostname ns4.xserver.jp directs to 183.90.224.226, 183.90.224.230 and 202.226.39.247.
The hostname ns5.xserver.jp directs to 157.112.182.218, 157.112.182.220 and 202.226.37.247.
Hosts with just one IP address:
ns2.xserver.jp has the IP address 35.72.43.26.
ns3.xserver.jp has the IP address 202.226.36.247.
Mail Servers
Mail for b-school.jp is handled by one mail server — b-school.jp.
b-school.jp directs to just one IP number, 210.173.226.93.