tetsu.co.jp - robtex.com
tetsu.co.jp
| DNSSEC | ⚠️ Not signed | ||||||
| A | 153.122.205.50🇯🇵 AS131921153.122.192.0/20 GMO CLOUD K.K. GMO GlobalSign Holdings K.K. | ||||||
| NS | tetsu.co.jp ⭐ | ||||||
| A | 153.122.205.50🇯🇵 AS131921153.122.192.0/20 GMO CLOUD K.K. GMO GlobalSign Holdings K.K. | ||||||
| NS | dnss10.so-net.ne.jp | ||||||
| A | 210.139.255.1🇯🇵 So-net210.139.128.0/17 Sony Network Communications Inc. | ||||||
| PTR | dnss10.so-net.ne.jp | ||||||
| NS | dnss11.so-net.ne.jp | ||||||
| A | 210.139.255.17🇯🇵 So-net210.139.128.0/17 Sony Network Communications Inc. | ||||||
| PTR | dnss11.so-net.ne.jp | ||||||
| MX | mx.tetsu.co.jp ⭐ | ||||||
| A | 153.122.206.94🇯🇵 AS131921153.122.192.0/20 GMO CLOUD K.K. GMO GlobalSign Holdings K.K. | ||||||
| TXT | v=spf1 include:_spf.shared-server.net +mx ~all | ||||||
| SOA | tetsu.co.jphostmaster@tetsu.co.jp serial=2602171610 | ||||||
co.jp
| DNSSEC | ⚠️ Not signed | ||||||
| TXT | co.jp. | ||||||
NS for
tetsu.co.jp |
Previously MX for
tetsu.co.jp |
Subdomains
mx.tetsu.co.jp |
Same first word
tetsu.co.uk |
tetsu.org |
tetsu.co.jp |
tetsu.jp |
tetsu.com.br |
tetsu.de |
tetsu.live |
tetsu.se |
tetsu.com |
tetsu.be |
tetsu.biz |
tetsu.name |
tetsu.info |
tetsu.com.au |
Similar names
DNS History
8 records (5 active, 3 former)
●NSdnss10.so-net.ne.jp2015-06-09 → 2026-07-28 · 2 obs
● 2026-07-28 15:40:46
●NSdnss11.so-net.ne.jp2015-06-09 → 2026-07-28 · 2 obs
● 2026-07-28 15:40:46
●NStetsu.co.jp2015-06-09 → 2026-07-28 · 2 obs
● 2026-07-28 15:40:46
●MXmx.tetsu.co.jp2016-01-04 → 2026-07-28 · 3 obs
● 2016-01-04 05:38:30
● 2026-07-28 15:40:46
○MXtetsu.co.jp2015-06-09 → 2015-10-27 · 4 obs
● 2015-10-27 09:36:58
○ 2016-01-04 05:38:30
○ 2026-07-28 15:40:46
●A153.122.205.502026-07-02 → 2026-07-28 · 3 obs
● 2026-07-02 05:01:58
● 2026-07-28 15:40:46
○A203.105.85.862015-06-09 → 2015-10-27 · 4 obs
● 2015-10-27 09:36:58
○ 2016-01-04 05:38:30
○ 2026-07-28 15:40:46
○A211.13.196.1542016-01-04 → 2017-05-24 · 5 obs
● 2016-01-04 05:38:30
● 2017-05-24 09:38:30
○ 2026-07-02 05:01:58
○ 2026-07-28 15:40:46
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| jp | a.dns.jp, b.dns.jp, c.dns.jp, d.dns.jp... | - |
| tetsu.co.jp | dnss10.so-net.ne.jp, dnss11.so-net.ne.jp | - |
✅ Authoritative Response
Server:210.139.255.1
NS records: dnss10.so-net.ne.jp, dnss11.so-net.ne.jp
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for tetsu.co.jp (unsigned zone)
⏱️ Timing
Total: 1614ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 153.122.205.50 |
| NS | 2 | dnss10.so-net.ne.jp, dnss11.so-net.ne.jp |
| MX | 1 | mx.tetsu.co.jp (pri: 10) |
| TXT | 1 | v=spf1 include:_spf.shared-server.net +m |
| SOA | 1 | tetsu.co.jp hostmaster.tetsu.co.jp |
Analysis
Hierarchy
tetsu.co.jp serves as the parent of mx.tetsu.co.jp.
Name Server Role
tetsu.co.jp is listed as a name server for tetsu.co.jp — it is in-bailiwick, authoritative for its own domain.
The name servers dnss10.so-net.ne.jp and dnss11.so-net.ne.jp are often paired with tetsu.co.jp.
IP Addresses
tetsu.co.jp has exactly one IP address — 153.122.205.50.
kanoh.co.jp, javajive.jp, takeuchi-ius.com plus two other host names have IP numbers in common with tetsu.co.jp.
Name Servers
The DNS delegation for tetsu.co.jp uses three name servers — tetsu.co.jp, dnss10.so-net.ne.jp and dnss11.so-net.ne.jp.
tetsu.co.jp has at least partial name server overlap with other domains, such as micromation.co.jp, satokoukoku.com, foxyfox.net and two others.
Each of the three hostnames points to exactly one IP address: tetsu.co.jp points to 153.122.205.50, dnss10.so-net.ne.jp points to 210.139.255.1 and dnss11.so-net.ne.jp points to 210.139.255.17.
Mail Servers
tetsu.co.jp uses one mail server — mx.tetsu.co.jp.
mx.tetsu.co.jp points to one IP number — 153.122.206.94.