mx.skillup-s.com - robtex.com
mx.skillup-s.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 153.122.19.140🇯🇵 AS131921153.122.16.0/20 GMO CLOUD K.K. GMO GlobalSign Holdings K.K. | ||||||
| PTR | sub0000550242.hmk-temp.com | ||||||
skillup-s.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 203.137.185.184🇯🇵 IDC203.137.128.0/18 Frontier Inc. | ||||||
| NS | ns1.art21.co.jp ⭐ | ||||||
| NS | sdi05.h-ix.jp | ||||||
| MX | mx.skillup-s.com ⭐ | ||||||
| TXT | v=spf1 +ip4:203.137.185.184 +include:mailsvr02.art21.co.jp ~all | ||||||
| SOA | ns1.art21.co.jppostmaster@ns1.art21.co.jp 2024-01-23 #0 | ||||||
MX for
Same first word
Similar names
DNS History
2 records (1 active, 1 former)
●A153.122.19.1402026-03-24 → 2026-03-24 · 2 obs
○ 2020-04-08 01:32:44
● 2026-03-24 06:46:40
● 2026-03-24 06:46:40
○A153.128.31.1112020-04-08 → 2020-04-08 · 2 obs
● 2020-04-08 01:32:44
○ 2026-03-24 06:46:40
○ 2026-03-24 06:46:40
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net... | - |
| skillup-s.com | ns1.art21.co.jp, sdi05.h-ix.jp | - |
✅ Authoritative Response
Server:122.221.93.34
NS records: ns1.art21.co.jp, sdi05.h-ix.jp
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for skillup-s.com (unsigned zone)
⏱️ Timing
Total: 1010ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 153.122.19.140 |
Analysis
Mail Server Role
mx.skillup-s.com functions as a mail server for skillup-s.com.
IP Addresses
mx.skillup-s.com resolves to one IP number: 153.122.19.140.
other host names including mx.dohkohkai.or.jp, mx.cb-school.com, mx.imai-hcc.com, mx.asahibestlife.jp and mx.hosyuu.jp share IP numbers with mx.skillup-s.com.