mail.secondbrain.co.jp - robtex.com
mail.secondbrain.co.jp
| CNAME | secondbrain.co.jp | ||||||
| DNSSEC | ⚠️ Not signed | ||||||
| A | 112.78.112.81🇯🇵 SAKURA-C112.78.112.0/20 (4/OSAKA) SAKURA Internet // WEST JAPAN BACKBONE 1-8-15 Kyutaro-cho, Chuo Osaka 541-0056, Japan | ||||||
| PTR | www1771.sakura.ne.jp | ||||||
| NS | master.dns.ne.jp ⭐ | ||||||
| A | 210.224.172.18🇯🇵 SAKURA-C210.224.160.0/19 (1/OSAKA) SAKURA Internet // WEST JAPAN BACKBONE 1-8-15 Kyutaro-cho, Chuo Osaka 541-0056, Japan | ||||||
| PTR | master.dns.ne.jp | ||||||
| NS | ns1.dns.ne.jp | ||||||
| A | 61.211.236.1🇯🇵 SAKURA-B61.211.236.0/24 (4/TOKYO) SAKURA Internet // EAST JAPAN BACKBONE 1-8-15 Kyutaro-cho, Chuo Osaka 541-0056, Japan | ||||||
| PTR | ns1.dns.ne.jp | ||||||
| NS | ns2.dns.ne.jp | ||||||
| A | 133.167.21.1🇯🇵 SAKURA-C133.167.21.0/24 (OSAKA) SAKURA Internet // WEST JAPAN BACKBONE Grand Front Osaka Tower A 35F, 4-20 Ofukacho, Kita-ku, Osaka, Osaka 530-0011, Japan | ||||||
| PTR | ns2.dns.ne.jp | ||||||
| MX | secondbrain.co.jp ⭐ | ||||||
| A | 112.78.112.81🇯🇵 SAKURA-C112.78.112.0/20 (4/OSAKA) SAKURA Internet // WEST JAPAN BACKBONE 1-8-15 Kyutaro-cho, Chuo Osaka 541-0056, Japan | ||||||
| PTR | www1771.sakura.ne.jp | ||||||
| TXT | v=spf1 a:www1771.sakura.ne.jp mx ~all | ||||||
| TXT | google-site-verification=ESPLS3CyNc0beaWxTVu9a6oSGnSnycgq1e1wY-zz83g | ||||||
| TXT | google-site-verification=u5dYvLE45J_NhUHV6s90RQT4s92o-yECTBj1ndtnUCQ | ||||||
| SOA | master.dns.ne.jptech@sakura.ad.jp 2024-03-04 #1 | ||||||
secondbrain.co.jp
| DNSSEC | ⚠️ Not signed | ||||||
| A | 112.78.112.81🇯🇵 SAKURA-C112.78.112.0/20 (4/OSAKA) SAKURA Internet // WEST JAPAN BACKBONE 1-8-15 Kyutaro-cho, Chuo Osaka 541-0056, Japan | ||||||
| NS | master.dns.ne.jp ⭐ | ||||||
| NS | ns1.dns.ne.jp | ||||||
| NS | ns2.dns.ne.jp | ||||||
| MX | secondbrain.co.jp ⭐ | ||||||
| TXT | v=spf1 a:www1771.sakura.ne.jp mx ~all | ||||||
| TXT | google-site-verification=ESPLS3CyNc0beaWxTVu9a6oSGnSnycgq1e1wY-zz83g | ||||||
| TXT | google-site-verification=u5dYvLE45J_NhUHV6s90RQT4s92o-yECTBj1ndtnUCQ | ||||||
| SOA | master.dns.ne.jptech@sakura.ad.jp 2024-03-04 #1 | ||||||
Previously MX for
Same first word
Similar names
DNS History
3 records (1 active, 2 former)
○A210.166.220.562015-08-20 → 2015-08-20 · 2 obs
○ 2026-03-30 10:53:50
○CNAMEns.secondbrain.co.jp2015-08-20 → 2015-08-20 · 2 obs
○ 2026-03-30 10:53:50
●CNAMEsecondbrain.co.jp2026-03-30 → 2026-03-30 · 2 obs
● 2026-03-30 10:53:50
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| jp | a.dns.jp, b.dns.jp, c.dns.jp, d.dns.jp... | - |
| secondbrain.co.jp | ns1.dns.ne.jp, ns2.dns.ne.jp | 2 records |
✅ Authoritative Response
Server:133.167.21.1
NS records: ns1.dns.ne.jp, ns2.dns.ne.jp
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for secondbrain.co.jp (unsigned zone)
⏱️ Timing
Total: 887ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| CNAME | 1 | secondbrain.co.jp |
📌 Glue Records Collected
Total: 2
Out-of-bailiwick: 2 (ns1.dns.ne.jp, ns2.dns.ne.jp)
Analysis
IP Addresses
mail.secondbrain.co.jp resolves to a single IP: 112.78.112.81.
Other host names, for instance cctokyo.jp, ingo-web.com, chakrainbow.com, dream-lesson.com and mayutuba.net share IP numbers with mail.secondbrain.co.jp.
Name Servers
mail.secondbrain.co.jp delegates to three name servers: master.dns.ne.jp, ns1.dns.ne.jp and ns2.dns.ne.jp.
mail.secondbrain.co.jp shares some name servers with other domains, for example nihon5ch.net, chakura.net, sc-ast.jp, s.cardnavi-d.com and taikyukai.net.
These name servers are commonly used with the name servers dns.sakura.ad.jp.
Host names with a single IP: master.dns.ne.jp points to 210.224.172.18; ns1.dns.ne.jp points to 61.211.236.1; ns2.dns.ne.jp points to 133.167.21.1.
Mail Servers
mail.secondbrain.co.jp is handled by a single mail server, secondbrain.co.jp.
mail.secondbrain.co.jp uses the same mail server setup as other domains, for example secondbrain.co.jp.
Host name secondbrain.co.jp points to IP 112.78.112.81.