20b.jp - robtex.com
20b.jp
| DNSSEC | ⚠️ Not signed | ||||||
| A | 202.172.28.3🇯🇵 DRNET202.172.24.0/21 | ||||||
| PTR | s2.coreserver.jp | ||||||
| NS | ns1.value-domain.com ⭐ | ||||||
| A | 172.64.52.38🇺🇸 Cloudflare172.64.52.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| A | 172.64.52.161🇺🇸 Cloudflare172.64.52.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| NS | ns2.value-domain.com | ||||||
| A | 172.64.53.3🇺🇸 Cloudflare172.64.53.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| A | 172.64.53.115🇺🇸 Cloudflare172.64.53.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| MX | 20b.jp ⭐ | ||||||
| A | 202.172.28.3🇯🇵 DRNET202.172.24.0/21 | ||||||
| PTR | s2.coreserver.jp | ||||||
| TXT | v=spf1 ip4:202.172.28.3 include:mxr.valueserver.jp ~all | ||||||
| SOA | ns1.value-domain.comhostmaster@20b.jp 2023-07-30 #13 | ||||||
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=1777106703 | ||||||
MX for
20b.jp |
Same first word
Similar names
DNS History
7 records (4 active, 3 former)
●NSns1.value-domain.com2015-08-17 → 2026-04-25 · 2 obs
● 2026-04-25 08:58:24
●NSns2.value-domain.com2015-08-17 → 2026-04-25 · 2 obs
● 2026-04-25 08:58:24
●MX20b.jp2026-04-15 → 2026-04-25 · 3 obs
● 2026-04-15 03:59:22
● 2026-04-25 08:58:24
○MXmail.20b.jp2015-08-17 → 2017-08-03 · 4 obs
● 2017-08-03 18:06:24
○ 2026-04-15 03:59:22
○ 2026-04-25 08:58:24
○A150.95.9.882017-08-03 → 2017-08-03 · 4 obs
● 2017-08-03 18:06:24
○ 2026-04-15 03:59:22
○ 2026-04-25 08:58:24
●A202.172.28.32026-04-15 → 2026-04-25 · 3 obs
● 2026-04-15 03:59:22
● 2026-04-25 08:58:24
○A203.189.105.882015-08-17 → 2017-01-02 · 4 obs
● 2017-01-02 02:34:50
○ 2017-08-03 18:06:24
○ 2026-04-25 08:58:24
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| jp | a.dns.jp, b.dns.jp, c.dns.jp, d.dns.jp... | - |
| 20b.jp | ns2.value-domain.com, ns1.value-domain.com | - |
✅ Authoritative Response
Server:172.64.52.38
NS records: ns2.value-domain.com, ns1.value-domain.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for 20b.jp (unsigned zone)
⏱️ Timing
Total: 1079ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 202.172.28.3 |
| NS | 2 | ns2.value-domain.com, ns1.value-domain.com |
| MX | 1 | 20b.jp (pri: 10) |
| TXT | 1 | v=spf1 ip4:202.172.28.3 include:mxr.valu |
| SOA | 1 | ns1.value-domain.com hostmaster.20b.jp |
Analysis
Mail Server Role
20b.jp serves as the mail server for 20b.jp.
IP Addresses
20b.jp points to IP number 202.172.28.3.
For instance, other host names alfr.org, otatamashiro.com, mail.londoner25.net, mpmp.jp and ruy.jp share IP numbers with 20b.jp.
Name Servers
20b.jp is delegated to two name servers: ns1.value-domain.com and ns2.value-domain.com.
20b.jp uses the same name server setup as other domains such as hokenmirai.co.jp, health-memo.com, isono.be, adumayacoffee.jp and zapitmedia.com.
20b.jp shares name servers with other domains at least partially, for example prajp.net, melvic.co.jp, 86o.net, larkweb.com and onokaikei.com.
These name servers are commonly used alongside ns3.value-domain.com, ns4.value-domain.com, ns5.value-domain.com, ns11.value-domain.com, ns12.value-domain.com and ns13.value-domain.com.
Host names with two IP numbers:
ns1.value-domain.com points to 172.64.52.38 and 172.64.52.161; ns2.value-domain.com points to 172.64.53.3 and 172.64.53.115.
Mail Servers
20b.jp is handled by a single mail server, 20b.jp.
20b.jp points to a single IP: 202.172.28.3.