`jcs-elearning.org`

DNSSEC	⚠️ Not signed
A	133.125.39.86^{🇯🇵 SAKURA-A133.125.0.0/16 (ISHIKARI) SAKURA Internet // EAST JAPAN BACKBONE Grand Front Osaka Tower A 35F, 4-20 Ofukacho, Kita-ku, Osaka, Osaka 530-0011, Japan}
		PTR	`ik1-437-50832.vs.sakura.ne.jp`
NS	`01.dnsv.jp` ⭐
		A	2400:8500:3300::53^{🇯🇵 GMO-DNS2400:8500:3300::/48 GMO Internet,inc.}
			PTR	`01.dnsv.jp`
		A	157.7.32.53^{🇯🇵 GMO-DNS157.7.32.0/24 GMO Internet,inc. Network-Team.}
			PTR	`01.dnsv.jp`
NS	`02.dnsv.jp`
		A	157.7.33.53^{🇯🇵 GMO-DNS157.7.33.0/24 GMO Internet,inc. Network-Team.}
			PTR	`02.dnsv.jp`
NS	`03.dnsv.jp`
		A	2400:8500:3000::53^{🇯🇵 GMO-DNS2400:8500:3000::/48 GMO Internet,inc.}
			PTR	`03.dnsv.jp`
		A	157.7.34.53^{🇯🇵 GMO-DNS157.7.34.0/24 GMO Internet,inc. Network-Team.}
			PTR	`03.dnsv.jp`
NS	`04.dnsv.jp`
		A	2400:8500:3fff::53^{🇯🇵 GMO-DNS2400:8500:3fff::/48 GMO Internet,inc.}
			PTR	`04.dnsv.jp`
		A	157.7.35.53^{🇯🇵 GMO-DNS157.7.35.0/24 GMO Internet,inc. Network-Team.}
			PTR	`04.dnsv.jp`
MX	`jcs-elearning.org` ⭐
		A	133.125.39.86^{🇯🇵 SAKURA-A133.125.0.0/16 (ISHIKARI) SAKURA Internet // EAST JAPAN BACKBONE Grand Front Osaka Tower A 35F, 4-20 Ofukacho, Kita-ku, Osaka, Osaka 530-0011, Japan}
			PTR	`ik1-437-50832.vs.sakura.ne.jp`
TXT	`v=spf1 a mx include:spf.gmoserver.jp -all`
SOA	`01.dnsv.jp`hostmaster@dnsv.jp serial=1770937191

`org`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a0.org.afilias-nst.info` ⭐ ⚠️ Not in parent delegation
	NS	`a2.org.afilias-nst.info` ⚠️ Not in parent delegation
	NS	`b0.org.afilias-nst.org`
	NS	`b2.org.afilias-nst.org`
	NS	`c0.org.afilias-nst.info` ⚠️ Not in parent delegation
	NS	`d0.org.afilias-nst.org`
	SOA	`a0.org.afilias-nst.info`hostmaster@donuts.email serial=1773551953

MX for

jcs-elearning.org

Same first word

jcs-elearning.org

DNS History

14 records (6 active, 8 former)

●NS01.dnsv.jp2020-01-28 → 2026-03-24 · 3 obs

○ 2017-01-14 03:45:06
● 2020-01-28 14:48:40
● 2026-03-24 12:50:10

●NS02.dnsv.jp2020-01-28 → 2026-03-24 · 3 obs

○ 2017-01-14 03:45:06
● 2020-01-28 14:48:40
● 2026-03-24 12:50:10

●NS03.dnsv.jp2020-01-28 → 2026-03-24 · 3 obs

○ 2017-01-14 03:45:06
● 2020-01-28 14:48:40
● 2026-03-24 12:50:10

●NS04.dnsv.jp2020-01-28 → 2026-03-24 · 3 obs

○ 2017-01-14 03:45:06
● 2020-01-28 14:48:40
● 2026-03-24 12:50:10

○NS2nd.dnsv.jp2016-01-18 → 2017-01-14 · 5 obs

○ 2015-10-20 13:53:12
● 2016-01-18 01:41:04
● 2017-01-14 03:45:06
○ 2020-01-28 14:48:40
○ 2026-03-24 12:50:10

○NSdns.jcs-elearning.org2016-01-18 → 2017-01-14 · 5 obs

○ 2015-10-20 13:53:12
● 2016-01-18 01:41:04
● 2017-01-14 03:45:06
○ 2020-01-28 14:48:40
○ 2026-03-24 12:50:10

○NSns01.gmoserver.jp2015-05-14 → 2015-10-20 · 4 obs

● 2015-05-14 14:17:46
● 2015-10-20 13:53:12
○ 2016-01-18 01:41:04
○ 2026-03-24 12:50:10

○NSns02.gmoserver.jp2015-05-14 → 2015-10-20 · 4 obs

● 2015-05-14 14:17:46
● 2015-10-20 13:53:12
○ 2016-01-18 01:41:04
○ 2026-03-24 12:50:10

●MXjcs-elearning.org2016-01-18 → 2026-03-24 · 6 obs

○ 2015-10-20 13:53:12
● 2016-01-18 01:41:04
● 2017-01-14 03:45:06
○ 2020-01-28 14:48:40
● 2026-03-24 11:06:44
● 2026-03-24 12:50:10

○MXmx.jcs-elearning.org2015-05-14 → 2015-10-20 · 4 obs

● 2015-05-14 14:17:46
● 2015-10-20 13:53:12
○ 2016-01-18 01:41:04
○ 2026-03-24 12:50:10

●A133.125.39.862026-03-24 → 2026-03-24 · 3 obs

○ 2020-01-28 14:48:40
● 2026-03-24 11:06:44
● 2026-03-24 12:50:10

○A133.130.70.1302016-01-18 → 2017-01-14 · 5 obs

○ 2015-10-20 13:53:12
● 2016-01-18 01:41:04
● 2017-01-14 03:45:06
○ 2020-01-28 14:48:40
○ 2026-03-24 12:50:10

○A153.126.205.1002020-01-28 → 2020-01-28 · 4 obs

○ 2017-01-14 03:45:06
● 2020-01-28 14:48:40
○ 2026-03-24 11:06:44
○ 2026-03-24 12:50:10

○A61.113.79.1882015-05-14 → 2015-10-20 · 4 obs

● 2015-05-14 14:17:46
● 2015-10-20 13:53:12
○ 2016-01-18 01:41:04
○ 2026-03-24 12:50:10

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
org	b0.org.afilias-nst.org, b2.org.afilias-nst.org, d0.org.afilias-nst.org	-
jcs-elearning.org	04.dnsv.jp, 01.dnsv.jp, 02.dnsv.jp, 03.dnsv.jp	-

✅ Authoritative Response

Server:157.7.35.53

NS records: 04.dnsv.jp, 01.dnsv.jp, 02.dnsv.jp, 03.dnsv.jp

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for jcs-elearning.org (unsigned zone)

⏱️ Timing

Total: 1123ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`133.125.39.86`
NS	4	`01.dnsv.jp, 02.dnsv.jp...`
MX	1	`jcs-elearning.org (pri: 10)`
TXT	1	`v=spf1 a mx include:spf.gmoserver.jp -al`
SOA	1	`01.dnsv.jp hostmaster.dnsv.jp`

Analysis

Mail Server Role

jcs-elearning.org serves as the mail server for jcs-elearning.org.

IP Addresses

jcs-elearning.org points to a single IP number: 133.125.39.86.

Other host names, for example ik1-437-50832.vs.sakura.ne.jp, msvista.net, kusaka.me and mlvista.com share IP numbers with jcs-elearning.org.

Name Servers

jcs-elearning.org is delegated to four name servers: 01.dnsv.jp, 02.dnsv.jp, 03.dnsv.jp and 04.dnsv.jp.

jcs-elearning.org shares name servers with other domains at least partially, for instance hinoki-ya.com, ophtecs.co.jp, nf-camera.com, pickleball-jpn.shop and annamtelecom.asia.

Host names with two IP numbers:

01.dnsv.jp points to: 2400:8500:3300::53 and 157.7.32.53.

03.dnsv.jp points to: 2400:8500:3000::53 and 157.7.34.53.

04.dnsv.jp points to: 2400:8500:3fff::53 and 157.7.35.53.

Host names with one IP number:

02.dnsv.jp points to: 157.7.33.53.

Mail Servers

A single mail server handles jcs-elearning.org and jcs-elearning.org.

Host name jcs-elearning.org resolves to IP 133.125.39.86.

jcs-elearning.org - robtex.com