besttech21.com - robtex.com
besttech21.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 221.139.49.7🇰🇷 SKB-NET221.138.0.0/15 SK Broadband | ||||||
| NS | ns1.nurihosting.com ⭐ | ||||||
| A | 211.215.17.210🇰🇷 SKB-NET211.212.0.0/14 SK Broadband | ||||||
| NS | ns1.web79.kr ⚠️ Not in zone NS records | ||||||
| A | 221.139.49.17🇰🇷 SKB-NET221.138.0.0/15 SK Broadband | ||||||
| NS | ns2.web79.kr ⚠️ Not in zone NS records | ||||||
| A | 121.125.73.38🇰🇷 SKB-NET121.125.0.0/16 SK Broadband | ||||||
| MX | mail.besttech21.com ⭐ | ||||||
| A | 221.139.49.4🇰🇷 SKB-NET221.138.0.0/15 SK Broadband | ||||||
| TXT | v=spf1 ip4:221.139.49.3 ip4:221.139.49.4 ip4:221.139.49.7 ip4:121.125.73.51 ... | ||||||
| SOA | ns1.nurihosting.comsupport@nurihosting.com 2023-01-26 #1 | ||||||
com
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a.gtld-servers.net ⭐ | ||||||
| NS | b.gtld-servers.net | ||||||
| NS | c.gtld-servers.net | ||||||
| NS | d.gtld-servers.net | ||||||
| NS | e.gtld-servers.net | ||||||
| NS | f.gtld-servers.net | ||||||
| NS | g.gtld-servers.net | ||||||
| NS | h.gtld-servers.net | ||||||
| NS | i.gtld-servers.net | ||||||
| NS | j.gtld-servers.net | ||||||
| NS | k.gtld-servers.net | ||||||
| NS | l.gtld-servers.net | ||||||
| NS | m.gtld-servers.net | ||||||
| SOA | a.gtld-servers.netnstld@verisign-grs.com serial=1774731907 | ||||||
Previously NS for
besttech21.com |
Subdomains
mail.besttech21.com |
Same first word
besttech21.com |
DNS History
12 records (5 active, 7 former)
○NSbesttech21.com2015-07-06 → 2017-08-19 · 4 obs
● 2017-08-19 14:18:08
○ 2026-03-09 02:01:50
○ 2026-03-28 21:16:04
○NSns.cafe24.com2015-07-06 → 2017-08-19 · 4 obs
● 2017-08-19 14:18:08
○ 2026-03-09 02:01:50
○ 2026-03-28 21:16:04
●NSns1.nurihosting.com2026-03-09 → 2026-03-28 · 3 obs
● 2026-03-09 02:01:50
● 2026-03-28 21:16:04
●NSns1.web79.kr2026-03-09 → 2026-03-28 · 3 obs
● 2026-03-09 02:01:50
● 2026-03-28 21:16:04
○NSns2.cafe24.com2015-07-06 → 2017-08-19 · 4 obs
● 2017-08-19 14:18:08
○ 2026-03-09 02:01:50
○ 2026-03-28 21:16:04
●NSns2.web79.kr2026-03-09 → 2026-03-28 · 3 obs
● 2026-03-09 02:01:50
● 2026-03-28 21:16:04
○MXdmx-1.naver.com2015-07-06 → 2016-07-14 · 4 obs
● 2016-07-14 09:12:58
○ 2017-08-19 14:18:08
○ 2026-03-28 21:16:04
○MXdmx-2.naver.com2015-07-06 → 2016-07-14 · 4 obs
● 2016-07-14 09:12:58
○ 2017-08-19 14:18:08
○ 2026-03-28 21:16:04
●MXmail.besttech21.com2026-03-09 → 2026-03-28 · 3 obs
● 2026-03-09 02:01:50
● 2026-03-28 21:16:04
○MXw-160.cafe24.com2017-08-19 → 2017-08-19 · 4 obs
● 2017-08-19 14:18:08
○ 2026-03-09 02:01:50
○ 2026-03-28 21:16:04
○A218.145.65.2382015-07-06 → 2017-08-19 · 4 obs
● 2017-08-19 14:18:08
○ 2026-03-09 02:01:50
○ 2026-03-28 21:16:04
●A221.139.49.72026-03-09 → 2026-03-28 · 3 obs
● 2026-03-09 02:01:50
● 2026-03-28 21:16:04
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | l.gtld-servers.net, j.gtld-servers.net, h.gtld-servers.net, d.gtld-servers.net... | - |
| besttech21.com | ns1.web79.kr, ns2.web79.kr | - |
✅ Authoritative Response
Server:121.125.73.38
NS records: ns1.web79.kr, ns2.web79.kr
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for besttech21.com (unsigned zone)
⏱️ Timing
Total: 1472ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 221.139.49.7 |
| MX | 1 | mail.besttech21.com (pri: 10) |
| TXT | 1 | v=spf1 ip4:221.139.49.3 ip4:221.139.49.4 |
| SOA | 1 | ns1.nurihosting.com support.nurihosting. |
Analysis
Hierarchy
besttech21.com is the parent of mail.besttech21.com.
IP Addresses
besttech21.com resolves to one IP number: 221.139.49.7.
other host names including koreainvest.net, mail.saejaefarm.com, lavinu.co.kr, mgomija.com and saejaefarm.com share IP numbers with besttech21.com.
Name Servers
besttech21.com is delegated to three name servers ns1.nurihosting.com, ns1.web79.kr and ns2.web79.kr.
besttech21.com at least partially shares name servers with other domains, for instance web79.kr, ksart.co.kr, 19mart.net, jieum.net and adwinkorea.kr.
These name servers are commonly used with the following name servers: ns2.nurihosting.com, ns1.aramschool.co.kr, ns2.aramschool.co.kr, ns1.hmandoo.co.kr, ns2.hmandoo.co.kr, ns1.anybuild.co.kr, ns2.anybuild.co.kr, ns1.chamsoft.kr, ns1.diosoft.kr and ns2.diosoft.kr.
Host names with one IP number: ns1.nurihosting.com points to 211.215.17.210; ns1.web79.kr points to 221.139.49.17; ns2.web79.kr points to 121.125.73.38.
Mail Servers
besttech21.com is handled by a single mail server, mail.besttech21.com.
mail.besttech21.com resolves to IP 221.139.49.4.