doublecheck.jp - dns.ninja
doublecheck.jp
| DNSSEC | ⚠️ Not signed | ||||||
| A | 124.146.222.36🇯🇵 InfoSphere124.146.128.0/17 INFOSPHERE | ||||||
| PTR | furutani.jp | ||||||
| NS | ns3.sphere.ad.jp ⭐ | ||||||
| A | 202.239.113.22🇯🇵 InfoSphere202.239.64.0/18 INFOSPHERE | ||||||
| PTR | ns3.sphere.ad.jp | ||||||
| NS | ns4.sphere.ad.jp | ||||||
| A | 202.239.113.30🇯🇵 InfoSphere202.239.64.0/18 INFOSPHERE | ||||||
| PTR | ns4.sphere.ad.jp | ||||||
| MX | doublecheck.jp ⭐ | ||||||
| A | 124.146.222.36🇯🇵 InfoSphere124.146.128.0/17 INFOSPHERE | ||||||
| PTR | furutani.jp | ||||||
| TXT | v=spf1 include:fmx.etius.jp +ip4:124.146.222.36/32 +ip4:124.146.222.2/32 -all | ||||||
| SOA | ns3.sphere.ad.jpdns@sphere.ad.jp serial=1576034027 | ||||||
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=1784047502 | ||||||
MX for
doublecheck.jp |
Same first word
Similar names
DNS History
4 records (4 active, 0 former)
●NSns3.sphere.ad.jp2015-07-13 → 2026-07-14 · 2 obs
● 2026-07-14 17:11:58
●NSns4.sphere.ad.jp2015-07-13 → 2026-07-14 · 2 obs
● 2026-07-14 17:11:58
●MXdoublecheck.jp2015-07-13 → 2026-07-14 · 2 obs
● 2026-07-14 17:11:58
●A124.146.222.362015-07-13 → 2026-07-14 · 2 obs
● 2026-07-14 17:11:58
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| jp | a.dns.jp, b.dns.jp, c.dns.jp, d.dns.jp... | - |
| doublecheck.jp | ns3.sphere.ad.jp, ns4.sphere.ad.jp | - |
✅ Authoritative Response
Server:202.239.113.22
NS records: ns3.sphere.ad.jp, ns4.sphere.ad.jp
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for doublecheck.jp (unsigned zone)
⏱️ Timing
Total: 1563ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 124.146.222.36 |
| NS | 2 | ns3.sphere.ad.jp, ns4.sphere.ad.jp |
| MX | 1 | doublecheck.jp (pri: 10) |
| TXT | 1 | v=spf1 include:fmx.etius.jp +ip4:124.146 |
| SOA | 1 | ns3.sphere.ad.jp dns.sphere.ad.jp |
Analysis
Mail Server Role
The MX record for doublecheck.jp points back to doublecheck.jp — it is its own mail server.
IP Addresses
doublecheck.jp directs to one IP number, which is 124.146.222.36.
Host names like furutani.jp are further examples that share IP numbers with doublecheck.jp.
Name Servers
Two name servers handle the delegation for doublecheck.jp: ns3.sphere.ad.jp and ns4.sphere.ad.jp.
doublecheck.jp has the same name server delegation as a number of other domains, such as www.adpec.co.jp, setoprint.jp, betanet.co.jp and two more.
The name servers of doublecheck.jp overlap at least partially with those of other domains — among them ai-link.jp, drm.jp, dnserver1.info and two more.
Both ns3.sphere.ad.jp and ns4.sphere.ad.jp have a single IP address each — ns3.sphere.ad.jp resolves to 202.239.113.22 while ns4.sphere.ad.jp resolves to 202.239.113.30.
Mail Servers
The MX record for doublecheck.jp points to a single mail server: doublecheck.jp.
doublecheck.jp carries a single IP number, which is 124.146.222.36.