`kasai21.com`

DNSSEC	⚠️ Not signed
A	182.16.226.147^{🇯🇵 atworks182.16.224.0/21 A.T.WORKS,Inc. CIDR-block NO.2}
		PTR	`onx06.atw.ne.jp`
NS	`ns0.atw.jp` ⭐
		A	182.16.226.200^{🇯🇵 atworks182.16.224.0/21 A.T.WORKS,Inc. CIDR-block NO.2}
			PTR	`ns0.atw.jp`
NS	`ns.dlsv.com` ⚠️ Not in zone NS records
		A	210.236.247.71^{🇯🇵 IDC210.236.240.0/20 Frontier Inc.}
NS	`ns1.atw.jp` ⚠️ Not in parent delegation
		A	210.236.247.71^{🇯🇵 IDC210.236.240.0/20 Frontier Inc.}
NS	`ns2.atw.jp` ⚠️ Not in parent delegation
		A	219.99.220.242^{🇯🇵 NSK219.99.192.0/19 Co.,Ltd. 2-1,Minami-cho,Kanazawa-shi,Ishikawa,920-8769}
			PTR	`ns2.atw.jp`
NS	`ns2.dlsv.com` ⚠️ Not in zone NS records
		A	219.99.220.242^{🇯🇵 NSK219.99.192.0/19 Co.,Ltd. 2-1,Minami-cho,Kanazawa-shi,Ishikawa,920-8769}
			PTR	`ns2.atw.jp`
NS	`ns3.atw.jp` ⚠️ Not in parent delegation
		A	182.16.226.193^{🇯🇵 atworks182.16.224.0/21 A.T.WORKS,Inc. CIDR-block NO.2}
			PTR	`ns3.atw.jp`
NS	`ns3.dlsv.com` ⚠️ Not in zone NS records
		A	182.16.226.193^{🇯🇵 atworks182.16.224.0/21 A.T.WORKS,Inc. CIDR-block NO.2}
			PTR	`ns3.atw.jp`
MX	`smtp.kasai21.com` ⭐
		A	182.16.226.147^{🇯🇵 atworks182.16.224.0/21 A.T.WORKS,Inc. CIDR-block NO.2}
			PTR	`onx06.atw.ne.jp`
TXT	`v=spf1 +ip4:182.16.226.147 ~all`
SOA	`ns0.atw.jp`hostmaster@atw.jp 2020-07-15 #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.net`nstld@verisign-grs.com serial=1776853727

Subdomains

smtp.kasai21.com

Same first word

kasai21.com

DNS History

11 records (9 active, 2 former)

●NSns.dlsv.com2015-07-17 → 2026-04-22 · 2 obs

● 2015-07-17 01:04:36
● 2026-04-22 10:50:08

●NSns0.atw.jp2026-02-27 → 2026-04-22 · 3 obs

○ 2015-07-17 01:04:36
● 2026-02-27 15:12:00
● 2026-04-22 10:50:08

●NSns1.atw.jp2026-02-27 → 2026-04-22 · 3 obs

○ 2015-07-17 01:04:36
● 2026-02-27 15:12:00
● 2026-04-22 10:50:08

●NSns2.atw.jp2026-02-27 → 2026-04-22 · 3 obs

○ 2015-07-17 01:04:36
● 2026-02-27 15:12:00
● 2026-04-22 10:50:08

●NSns2.dlsv.com2015-07-17 → 2026-04-22 · 2 obs

● 2015-07-17 01:04:36
● 2026-04-22 10:50:08

●NSns3.atw.jp2026-02-27 → 2026-04-22 · 3 obs

○ 2015-07-17 01:04:36
● 2026-02-27 15:12:00
● 2026-04-22 10:50:08

●NSns3.dlsv.com2015-07-17 → 2026-04-22 · 2 obs

● 2015-07-17 01:04:36
● 2026-04-22 10:50:08

●MXsmtp.kasai21.com2015-07-17 → 2026-04-22 · 2 obs

● 2015-07-17 01:04:36
● 2026-04-22 10:50:08

●A182.16.226.1472026-02-27 → 2026-04-22 · 3 obs

○ 2019-01-21 02:16:20
● 2026-02-27 15:12:00
● 2026-04-22 10:50:08

○A210.188.235.562015-07-17 → 2017-02-05 · 4 obs

● 2015-07-17 01:04:36
● 2017-02-05 09:45:22
○ 2019-01-21 02:16:20
○ 2026-04-22 10:50:08

○A219.99.220.2142019-01-21 → 2019-01-21 · 4 obs

○ 2017-02-05 09:45:22
● 2019-01-21 02:16:20
○ 2026-02-27 15:12:00
○ 2026-04-22 10:50:08

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	b.gtld-servers.net, k.gtld-servers.net, d.gtld-servers.net, e.gtld-servers.net...	-
kasai21.com	ns3.dlsv.com, ns2.dlsv.com, ns.dlsv.com	3 records

✅ Authoritative Response

Server:219.99.220.242

NS records: ns3.dlsv.com, ns2.dlsv.com, ns.dlsv.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for kasai21.com (unsigned zone)

⏱️ Timing

Total: 949ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`182.16.226.147`
NS	3	`ns3.atw.jp, ns2.atw.jp...`
MX	1	`smtp.kasai21.com (pri: 10)`
TXT	1	`v=spf1 +ip4:182.16.226.147 ~all`
SOA	1	`ns0.atw.jp hostmaster.atw.jp`

📌 Glue Records Collected

Total: 3

Out-of-bailiwick: 3 (ns3.dlsv.com, ns2.dlsv.com, ns.dlsv.com)

Analysis

Hierarchy

kasai21.com is parent of smtp.kasai21.com.

IP Addresses

kasai21.com points to a single IP: 182.16.226.147.

Other host names, for instance smtp.be-earth.com, www.g-kotetsu.com, onx06.atw.ne.jp, smtp.sck.or.jp and aspal.jp share IP numbers with kasai21.com.

Name Servers

kasai21.com delegates to seven name servers: ns2.dlsv.com, ns3.dlsv.com, ns.dlsv.com, ns0.atw.jp, ns1.atw.jp, ns2.atw.jp and ns3.atw.jp.

kasai21.com at least partially shares its name servers with other domains, for instance global-hd.com, alx04.atw.ne.jp, kohsyun.co.jp, aiosu.com and daichi.net.