c-school.jp - robtex.com

c-school.jp

DNSSEC⚠️ Not signed
A157.7.44.176🇯🇵 GMO-INTERNET157.7.40.0/21 GMO Internet,Inc Cerulean Tower, 11F Sakuragaokacho-26-1 Shibuya-ku, Tokyo 150-8512, Japan
PTRusers258.vip.heteml.jp
NS01.dnsv.jp ⭐
A2400:8500:3300::53🇯🇵 GMO-DNS2400:8500:3300::/48 GMO Internet,inc.
PTR01.dnsv.jp
A157.7.32.53🇯🇵 GMO-DNS157.7.32.0/24 GMO Internet,inc. Network-Team.
PTR01.dnsv.jp
NS02.dnsv.jp
A157.7.33.53🇯🇵 GMO-DNS157.7.33.0/24 GMO Internet,inc. Network-Team.
PTR02.dnsv.jp
NS03.dnsv.jp
A2400:8500:3000::53🇯🇵 GMO-DNS2400:8500:3000::/48 GMO Internet,inc.
PTR03.dnsv.jp
A157.7.34.53🇯🇵 GMO-DNS157.7.34.0/24 GMO Internet,inc. Network-Team.
PTR03.dnsv.jp
NS04.dnsv.jp
A2400:8500:3fff::53🇯🇵 GMO-DNS2400:8500:3fff::/48 GMO Internet,inc.
PTR04.dnsv.jp
A157.7.35.53🇯🇵 GMO-DNS157.7.35.0/24 GMO Internet,inc. Network-Team.
PTR04.dnsv.jp
MXaspmx.l.google.com ⭐
A2607:f8b0:4004:c27::1b🇺🇸 Google2607:f8b0:4004::/48
A172.253.62.27🇺🇸 Google172.253.62.0/24
MXalt1.aspmx.l.google.com(20)
A2800:3f0:4003:c0f::1b🇨🇱 Google2800:3f0:4003::/48
A108.177.123.27🇺🇸 Google108.177.123.0/24
MXalt2.aspmx.l.google.com(20)
A2a00:1450:400b:c02::1b🇮🇪 Google2a00:1450:400b::/48
PTRdj-in-f27.1e100.net
A172.253.116.27🇺🇸 Google172.253.116.0/24
PTRdj-in-f27.1e100.net
MXaspmx2.googlemail.com(30)
A2607:f8b0:4023:2801::1b🇺🇸 Google2607:f8b0::/32
PTRlcausi-in-f27.1e100.net
A192.178.128.27🇺🇸 Google192.178.128.0/24
PTRlcausi-in-f27.1e100.net
MXaspmx3.googlemail.com(30)
A2a00:1450:400b:c02::1a🇮🇪 Google2a00:1450:400b::/48
PTRdj-in-f26.1e100.net
A172.253.116.27🇺🇸 Google172.253.116.0/24
PTRdj-in-f27.1e100.net
MXaspmx4.googlemail.com(30)
A2a00:1450:4009:c0f::1b🇬🇧 Google2a00:1450:4009::/48
A192.178.223.26🇺🇸 Google192.178.223.0/24
MXaspmx5.googlemail.com(30)
A2607:f8b0:4001:c70::1b🇺🇸 Google2607:f8b0:4001::/48
PTRyucbful-in-f27.1e100.net
A192.178.209.27🇺🇸 Google192.178.209.0/24
PTRyucbful-in-f27.1e100.net
TXTgoogle-site-verification=c8gtbPuSg5TvZx0ugNiu6fUfmK6icO9b7O_f90ztHvs
TXTv=spf1 include:_spf.google.com ~all
SOA01.dnsv.jphostmaster@dnsv.jp serial=1647990715

jp

DNSSEC🔒 Signed (DS record present)
NSz.dns.jp ⭐
NSa.dns.jp
NSb.dns.jp
NSc.dns.jp
NSd.dns.jp
NSe.dns.jp
NSf.dns.jp
NSg.dns.jp
NSh.dns.jp
SOAz.dns.jproot@dns.jp serial=1778563802

PTR for

237.85.122.153.in-addr.arpa

Same first word

c-school.jp
c-school.ru

DNS History

13 records (12 active, 1 former)

20192020202120222023202420252026NS01.dnsv.jp02.dnsv.jp03.dnsv.jp04.dnsv.jpMXalt1.aspmx.l.google.comalt2.aspmx.l.google.comaspmx.l.google.comaspmx2.googlemail.comaspmx3.googlemail.comaspmx4.googlemail.comaspmx5.googlemail.comA157.7.44.176153.122.85.237
●NS01.dnsv.jp2018-05-13 → 2026-05-12 · 2 obs
● 2018-05-13 21:47:42
● 2026-05-12 05:44:56
●NS02.dnsv.jp2018-05-13 → 2026-05-12 · 2 obs
● 2018-05-13 21:47:42
● 2026-05-12 05:44:56
●NS03.dnsv.jp2018-05-13 → 2026-05-12 · 2 obs
● 2018-05-13 21:47:42
● 2026-05-12 05:44:56
●NS04.dnsv.jp2018-05-13 → 2026-05-12 · 2 obs
● 2018-05-13 21:47:42
● 2026-05-12 05:44:56
●MXalt1.aspmx.l.google.com2018-05-13 → 2026-05-12 · 2 obs
● 2018-05-13 21:47:42
● 2026-05-12 05:44:56
●MXalt2.aspmx.l.google.com2018-05-13 → 2026-05-12 · 2 obs
● 2018-05-13 21:47:42
● 2026-05-12 05:44:56
●MXaspmx.l.google.com2018-05-13 → 2026-05-12 · 2 obs
● 2018-05-13 21:47:42
● 2026-05-12 05:44:56
●MXaspmx2.googlemail.com2018-05-13 → 2026-05-12 · 2 obs
● 2018-05-13 21:47:42
● 2026-05-12 05:44:56
●MXaspmx3.googlemail.com2018-05-13 → 2026-05-12 · 2 obs
● 2018-05-13 21:47:42
● 2026-05-12 05:44:56
●MXaspmx4.googlemail.com2018-05-13 → 2026-05-12 · 2 obs
● 2018-05-13 21:47:42
● 2026-05-12 05:44:56
●MXaspmx5.googlemail.com2018-05-13 → 2026-05-12 · 2 obs
● 2018-05-13 21:47:42
● 2026-05-12 05:44:56
○A153.122.85.2372018-05-13 → 2018-05-13 · 3 obs
● 2018-05-13 21:47:42
○ 2026-03-25 08:27:48
○ 2026-05-12 05:44:56
●A157.7.44.1762026-03-25 → 2026-05-12 · 3 obs
○ 2018-05-13 21:47:42
● 2026-03-25 08:27:48
● 2026-05-12 05:44:56

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
jpc.dns.jp, g.dns.jp, b.dns.jp, a.dns.jp...-
c-school.jp04.dnsv.jp, 01.dnsv.jp, 02.dnsv.jp, 03.dnsv.jp7 records

✅ Authoritative Response

Server:157.7.33.53

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

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for c-school.jp (unsigned zone)

⏱️ Timing

Total: 618ms | Queries: -

📄 Records

TypeCountSample Data
A1157.7.44.176
NS401.dnsv.jp, 02.dnsv.jp...
MX7alt1.aspmx.l.google.com (pri: 20), alt2.aspmx.l.google.com (pri: 20)...
TXT2google-site-verification=c8gtbPuSg5TvZx0, v=spf1 include:_spf.google.com ~all
SOA101.dnsv.jp hostmaster.dnsv.jp

📌 Glue Records Collected

Total: 7

Out-of-bailiwick: 7 (01.dnsv.jp, 01.dnsv.jp, 02.dnsv.jp...)

Analysis

IP Addresses

c-school.jp points to a single IP: 157.7.44.176.

Other host names, for instance rugoh.co.jp, jtbgaiarec.jp, abp.jp, mail.konanmachi.com and umlaut.club share IP numbers with c-school.jp.

Name Servers

c-school.jp is delegated to four name servers: 01.dnsv.jp, 02.dnsv.jp, 03.dnsv.jp and 04.dnsv.jp.

c-school.jp at least partially shares its name servers with other domains, for instance tenkumo-dental.com, flagfootball.jp, mexicanpharmacy1st.online, ii-okinawa.com and pi-j.com.

Two IPs per host:

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.

One IP per host:

02.dnsv.jp points to 157.7.33.53.

Mail Servers

c-school.jp is handled by seven mail servers: aspmx2.googlemail.com, aspmx3.googlemail.com, aspmx4.googlemail.com, aspmx5.googlemail.com, aspmx.l.google.com, alt1.aspmx.l.google.com and alt2.aspmx.l.google.com.

c-school.jp shares some mail servers with other domains, including genesis-publications.com, djcassidy.com, ns500671.ns500742.ns500742.ns500671.ns500754.ns500688.ns500671.ns500704.ns500704.ns500688.ns500705.ns500678.ns500291.ns500649.tenderladiesbz.com, ns500698.ns500759.ns500759.ns500698.ns500698.ns500735.ns500698.ns500698.ns500735.ns500576.ns500698.ns500708.ns500708.ns500619.ns500576.ns500619.ns500619.trackreceptor.com and ns500731.ns500731.ns500731.ns500731.ns500742.ns500671.ns500731.ns500704.ns500742.ns500291.ns500649.ns500649.ns500666.ns500142.lusty(0x736c7574)z.com.

These mail servers are commonly used alongside the mail servers alt3.aspmx.l.google.com and alt4.aspmx.l.google.com.

Host names with two IP numbers:

aspmx2.googlemail.com points to 2607:f8b0:4023:2801::1b and 192.178.128.27.

aspmx3.googlemail.com points to 2a00:1450:400b:c02::1a and 172.253.116.27.

aspmx4.googlemail.com points to 2a00:1450:4009:c0f::1b and 192.178.223.26.

aspmx5.googlemail.com points to 2607:f8b0:4001:c70::1b and 192.178.209.27.

aspmx.l.google.com points to 2607:f8b0:4004:c27::1b and 172.253.62.27.

alt1.aspmx.l.google.com points to 2800:3f0:4003:c0f::1b and 108.177.123.27.

alt2.aspmx.l.google.com points to 2a00:1450:400b:c02::1b and 172.253.116.27.

Names pointing to 172.253.116.27: aspmx3.googlemail.com and alt2.aspmx.l.google.com.