co-sei-em.jp - robtex.com
co-sei-em.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=1786307402 | ||||||
Subdomains
mail.co-sei-em.jp |
Same first word
co-sei-em.jp |
DNS History
9 records (5 active, 4 former)
○NSns.ia-net.ad.jp2015-08-14 → 2020-02-17 · 4 obs
● 2020-02-17 11:14:58
○ 2026-06-13 21:00:20
○ 2026-08-09 21:00:34
●NSns000.d-53.net2026-06-13 → 2026-08-09 · 3 obs
● 2026-06-13 21:00:20
● 2026-08-09 21:00:34
●NSns001-5jnde98bu9c3ovbc.5.d-53.info2026-06-13 → 2026-08-09 · 3 obs
● 2026-06-13 21:00:20
● 2026-08-09 21:00:34
●NSns001-5jnde98bu9c3ovbc.5.d-53.jp2026-06-13 → 2026-08-09 · 3 obs
● 2026-06-13 21:00:20
● 2026-08-09 21:00:34
●NSns001-5jnde98bu9c3ovbc.5.d-53.net2026-06-13 → 2026-08-09 · 3 obs
● 2026-06-13 21:00:20
● 2026-08-09 21:00:34
○NSns2.ia-net.ad.jp2015-08-14 → 2020-02-17 · 4 obs
● 2020-02-17 11:14:58
○ 2026-06-13 21:00:20
○ 2026-08-09 21:00:34
○MXmail.co-sei-em.jp2015-08-14 → 2017-01-29 · 4 obs
● 2017-01-29 13:19:32
○ 2020-02-17 11:14:58
○ 2026-08-09 21:00:34
●MXmx.securemx.jp2026-06-13 → 2026-08-09 · 3 obs
● 2026-06-13 21:00:20
● 2026-08-09 21:00:34
○MXr001.mailsecurity-nec.jp2020-02-17 → 2020-02-17 · 4 obs
● 2020-02-17 11:14:58
○ 2026-06-13 21:00:20
○ 2026-08-09 21:00:34
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| jp | c.dns.jp, d.dns.jp, g.dns.jp, f.dns.jp... | - |
| co-sei-em.jp | ns001-5jnde98bu9c3ovbc.5.d-53.net, ns001-5jnde98bu9c3ovbc.5.d-53.info, ns001-5jnde98bu9c3ovbc.5.d-53.jp | - |
✅ Authoritative Response
Server:210.138.20.92
NS records: ns001-5jnde98bu9c3ovbc.5.d-53.net, ns001-5jnde98bu9c3ovbc.5.d-53.info, ns001-5jnde98bu9c3ovbc.5.d-53.jp
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for co-sei-em.jp (unsigned zone)
⏱️ Timing
Total: 998ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| NS | 3 | ns001-5jnde98bu9c3ovbc.5.d-53.jp, ns001-5jnde98bu9c3ovbc.5.d-53.net... |
| MX | 1 | mx.securemx.jp (pri: 10) |
| TXT | 1 | v=spf1 +ip4:180.10.244.8 +include:spf.se |
| SOA | 1 | ns000.d-53.net dns-managers.iij.ad.jp |
Analysis
Hierarchy
mail.co-sei-em.jp is delegated beneath co-sei-em.jp.
Name Servers
The domain co-sei-em.jp is delegated to these four name servers: ns000.d-53.net, ns001-5jnde98bu9c3ovbc.5.d-53.info, ns001-5jnde98bu9c3ovbc.5.d-53.jp and ns001-5jnde98bu9c3ovbc.5.d-53.net.
There is at least partial name server overlap between co-sei-em.jp and other domains — techno-labo.co.jp, printedconductives.com, 0.180.203.in-addr.arpa and two more among them.
These name servers regularly appear alongside dns-b.iij.ad.jp, dns-c.iij.ad.jp, rev.iij-dns.jp and 6 other name servers in NS record sets.
ns001-5jnde98bu9c3ovbc.5.d-53.info, ns001-5jnde98bu9c3ovbc.5.d-53.jp and ns001-5jnde98bu9c3ovbc.5.d-53.net each resolve to two IP addresses: ns001-5jnde98bu9c3ovbc.5.d-53.info resolves to 202.32.219.32 and 2001:240:bb81::28:32; ns001-5jnde98bu9c3ovbc.5.d-53.jp resolves to 203.180.146.92 and 2001:240:bb81::29:1092; ns001-5jnde98bu9c3ovbc.5.d-53.net resolves to 210.138.20.92 and 2001:240:bb81::29:92.
Mail Servers
co-sei-em.jp routes its mail through a single mail server, mx.securemx.jp.
co-sei-em.jp has the same mail server arrangement as a number of other domains, for example princehotels.co.jp, tsuneishi.com, account.re-tapirs.com and two more.
co-sei-em.jp shares at least some of its mail servers with other domains — for example e-2.co.jp, byora.co.jp, dhbk.co.jp and two more.
It is common to find these mail servers paired with the mail servers mx6.securemx.jp.
The host mx.securemx.jp directs to four IP numbers: 210.130.202.92, 210.130.202.93, 210.130.202.96 and 210.130.202.99.