lettersinc.jp - robtex.com
lettersinc.jp
| DNSSEC | ⚠️ Not signed | ||||||
| NS | lettersinc.jp ⭐ | ||||||
| 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 | sonet-common-mx.xspmail.jp ⭐ | ||||||
| A | 2001:240:bb81:94:160:13:60:174🇯🇵 IIJ-AS2001:240::/32 IIJ IPv6 BLOCK ( AS2497 ) | ||||||
| PTR | sonet-common-mx.xspmail.jp | ||||||
| A | 160.13.60.174🇯🇵 IIJ-AS160.13.0.0/16 IIJ IPv4 BLOCK ( AS2497 ) | ||||||
| PTR | sonet-common-mx.xspmail.jp | ||||||
| TXT | v=spf1 +include:plusdomain.spf.so-net.ne.jp ~all | ||||||
| SOA | lettersinc.jphostmaster@lettersinc.jp serial=2602171610 | ||||||
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=1778817603 | ||||||
NS for
lettersinc.jp |
Same first word
lettersinc.jp |
lettersinc.com |
Similar names
DNS History
4 records (4 active, 0 former)
●NSdnss10.so-net.ne.jp2026-05-13 → 2026-05-15 · 2 obs
● 2026-05-15 04:26:36
●NSdnss11.so-net.ne.jp2026-05-13 → 2026-05-15 · 2 obs
● 2026-05-15 04:26:36
●NSlettersinc.jp2026-05-13 → 2026-05-15 · 2 obs
● 2026-05-15 04:26:36
●MXsonet-common-mx.xspmail.jp2026-05-13 → 2026-05-15 · 2 obs
● 2026-05-15 04:26:36
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| jp | e.dns.jp, g.dns.jp, c.dns.jp, a.dns.jp... | - |
| lettersinc.jp | dnss11.so-net.ne.jp, dnss10.so-net.ne.jp | - |
✅ Authoritative Response
Server:210.139.255.1
NS records: dnss11.so-net.ne.jp, dnss10.so-net.ne.jp
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for lettersinc.jp (unsigned zone)
⏱️ Timing
Total: 3434ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| NS | 2 | dnss10.so-net.ne.jp, dnss11.so-net.ne.jp |
| MX | 1 | sonet-common-mx.xspmail.jp (pri: 10) |
| TXT | 1 | v=spf1 +include:plusdomain.spf.so-net.ne |
| SOA | 1 | lettersinc.jp hostmaster.lettersinc.jp |
Analysis
Name Server Role
lettersinc.jp acts as the name server for lettersinc.jp.
dnss10.so-net.ne.jp and dnss11.so-net.ne.jp are commonly used as name servers along with lettersinc.jp.
Name Servers
lettersinc.jp delegates to three name servers: lettersinc.jp, dnss10.so-net.ne.jp and dnss11.so-net.ne.jp.
lettersinc.jp shares name servers with other domains at least partially, for instance steelers.co.jp, tokai-kanko.jp, cosicosi.net, kensystem.jp and dsq-digital-square.com.
Host names with one IP number:
dnss10.so-net.ne.jp points to: 210.139.255.1.
dnss11.so-net.ne.jp points to: 210.139.255.17.
Mail Servers
The mail server for lettersinc.jp is sonet-common-mx.xspmail.jp.
lettersinc.jp shares the same mail server setup as other domains, including gontakun.org, keing.jp, koten-sakaba.com, ya-print.com and cha-kawasemi.jp.
Host name sonet-common-mx.xspmail.jp resolves to two IPs: 2001:240:bb81:94:160:13:60:174 and 160.13.60.174.