firstclass.co.kr - dns.ninja

firstclass.co.kr

DNSSEC⚠️ Not signed
A222.237.78.212🇰🇷 SKB-NET222.232.0.0/13 SK Broadband
PTR222-237-78-212.tongkni.co.kr
NSns3.dnszi.com ⭐
A121.78.251.20🇰🇷 KINXIDC-AS-KR121.78.224.0/19 KINX-Net
NSns18.dnszi.com
A121.78.72.36🇰🇷 KINXIDC-AS-KR121.78.72.0/24 KINX-IDC
PTRns18.dnszi.com
NSns51.dnszi.com ⚠️ Not in parent delegation
A27.1.16.81🇰🇷 DAOU-AS-KR27.1.16.0/22 DAOU Tech
PTRns51.dnszi.com
NSns62.dnszi.com ⚠️ Not in parent delegation
A58.120.225.167🇰🇷 SKB-NET58.120.0.0/13 auto-generated route object for 58.120.0.0/13
PTRns62.dnszi.com
NSns74.dnszi.com ⚠️ Not in parent delegation
A121.78.251.26🇰🇷 KINXIDC-AS-KR121.78.224.0/19 KINX-Net
SOAns3.dnszi.comroot@dnszi.com 2025-04-10 #1

co.kr

DNSSEC⚠️ Not signed
NSg.dns.kr ⭐ ⚠️ Not in parent delegation
NSb.dns.kr ⚠️ Not in parent delegation
NSc.dns.kr ⚠️ Not in parent delegation
NSd.dns.kr ⚠️ Not in parent delegation
NSe.dns.kr ⚠️ Not in parent delegation
NSf.dns.kr ⚠️ Not in parent delegation
SOAg.dns.krdomain-manager@nic.or.kr serial=2606040582
WOT: UNKNOWN (62/100)

Same first word

firstclass.fitness
firstclass.co.th
firstclass.fi
firstclass.com.sa
firstclass.solutions
firstclass.sa
firstclass.ru
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firstclass.com.tr
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firstclass.mx
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firstclass.cz
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firstclass.com.hk
firstclass.cl
firstclass.ch
firstclass.hu
firstclass.cn

Similar names

classfirst.in
calstrsifs.com
classfirst.com
firtsclass.com

DNS History

15 records (6 active, 9 former)

20162017201820192020202120222023202420252026NSns18.dnszi.comns3.dnszi.comns51.dnszi.comns62.dnszi.comns74.dnszi.comns1.sedoparking.comns2.sedoparking.comweb01.aca2000.netweb02.aca2000.netMXmail.nickstel.comA222.237.78.212107.191.52.210115.68.220.9761.78.62.21772.52.4.91
○NSns1.sedoparking.com2015-10-15 → 2015-12-13 · 5 obs
○ 2015-05-23 19:53:10
● 2015-10-15 07:01:54
● 2015-12-13 00:32:24
○ 2016-03-23 06:47:36
○ 2026-06-04 01:47:20
●NSns18.dnszi.com2016-03-23 → 2026-06-04 · 3 obs
○ 2015-12-13 00:32:24
● 2016-03-23 06:47:36
● 2026-06-04 01:47:20
○NSns2.sedoparking.com2015-10-15 → 2015-12-13 · 5 obs
○ 2015-05-23 19:53:10
● 2015-10-15 07:01:54
● 2015-12-13 00:32:24
○ 2016-03-23 06:47:36
○ 2026-06-04 01:47:20
●NSns3.dnszi.com2016-03-23 → 2026-06-04 · 3 obs
○ 2015-12-13 00:32:24
● 2016-03-23 06:47:36
● 2026-06-04 01:47:20
●NSns51.dnszi.com2016-03-23 → 2026-06-04 · 3 obs
○ 2015-12-13 00:32:24
● 2016-03-23 06:47:36
● 2026-06-04 01:47:20
●NSns62.dnszi.com2016-03-23 → 2026-06-04 · 3 obs
○ 2015-12-13 00:32:24
● 2016-03-23 06:47:36
● 2026-06-04 01:47:20
●NSns74.dnszi.com2016-03-23 → 2026-06-04 · 3 obs
○ 2015-12-13 00:32:24
● 2016-03-23 06:47:36
● 2026-06-04 01:47:20
○NSweb01.aca2000.net2015-05-23 → 2015-05-23 · 3 obs
● 2015-05-23 19:53:10
○ 2015-10-15 07:01:54
○ 2026-06-04 01:47:20
○NSweb02.aca2000.net2015-05-23 → 2015-05-23 · 3 obs
● 2015-05-23 19:53:10
○ 2015-10-15 07:01:54
○ 2026-06-04 01:47:20
○MXmail.nickstel.com2015-10-15 → 2015-12-13 · 4 obs
● 2015-10-15 07:01:54
● 2015-12-13 00:32:24
○ 2016-03-23 06:47:36
○ 2026-06-04 01:47:20
○A107.191.52.2102016-03-23 → 2017-02-11 · 5 obs
○ 2015-12-13 00:32:24
● 2016-03-23 06:47:36
● 2017-02-11 00:10:26
○ 2020-01-07 04:45:36
○ 2026-06-04 01:47:20
○A115.68.220.972020-01-07 → 2020-01-07 · 4 obs
○ 2017-02-11 00:10:26
● 2020-01-07 04:45:36
○ 2026-02-24 23:19:14
○ 2026-06-04 01:47:20
●A222.237.78.2122026-02-24 → 2026-06-04 · 3 obs
○ 2020-01-07 04:45:36
● 2026-02-24 23:19:14
● 2026-06-04 01:47:20
○A61.78.62.2172015-05-23 → 2015-05-23 · 3 obs
● 2015-05-23 19:53:10
○ 2015-10-15 07:01:54
○ 2026-06-04 01:47:20
○A72.52.4.912015-10-15 → 2015-12-13 · 5 obs
○ 2015-05-23 19:53:10
● 2015-10-15 07:01:54
● 2015-12-13 00:32:24
○ 2016-03-23 06:47:36
○ 2026-06-04 01:47:20

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
krc.dns.kr, e.dns.kr, d.dns.kr, g.dns.kr...10 records
firstclass.co.krns18.dnszi.com, ns3.dnszi.com-

✅ Authoritative Response

Server:121.78.72.36

NS records: ns18.dnszi.com, ns3.dnszi.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for firstclass.co.kr (unsigned zone)

⏱️ Timing

Total: 3398ms | Queries: -

📄 Records

TypeCountSample Data
A1222.237.78.212
NS5ns3.dnszi.com, ns74.dnszi.com...
SOA1ns3.dnszi.com root.dnszi.com

📌 Glue Records Collected

Total: 10

In-bailiwick: 10 (c.dns.kr, e.dns.kr, e.dns.kr...)

Analysis

IP Addresses

firstclass.co.kr resolves to one IP address: 222.237.78.212.

www.victim.site.kr, cyber.kr, www.plate.kr and two other host names share IP numbers with firstclass.co.kr.

Name Servers

firstclass.co.kr delegates to 5 name servers — ns18.dnszi.com, ns3.dnszi.com and ns51.dnszi.com among them, along with two more.

firstclass.co.kr partially shares its NS delegation with several other domains, including jmt.kr, ta2on.com, message.kr and two others.

These name servers are regularly seen alongside ns62.dnszi.com and ns74.dnszi.com as name servers.

Host names with one IP number:

ns18.dnszi.com points to the IP address 121.78.72.36.

ns3.dnszi.com points to the IP address 121.78.251.20.

ns51.dnszi.com points to the IP address 27.1.16.81.

ns62.dnszi.com points to the IP address 58.120.225.167.

ns74.dnszi.com points to the IP address 121.78.251.26.